[Qemu-devel] [RFC PATCH 1/4] hw:acpi: Make ACPI IO address space configurable

[Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>]

This is in preparation for adding support for ARM64 platforms
where it doesn't use port mapped IO for ACPI IO space.

Also add a flag to identify hw reduced ACPI platforms as they
might use GPIO hw for signaling ACPI platform events.

Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
---
 hw/acpi/memory_hotplug.c         | 13 ++++++++-----
 hw/i386/acpi-build.c             |  3 ++-
 include/hw/acpi/memory_hotplug.h |  6 ++++--
 3 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c
index 921cad2..05f1d45 100644
--- a/hw/acpi/memory_hotplug.c
+++ b/hw/acpi/memory_hotplug.c
@@ -34,7 +34,7 @@
 #define MEMORY_HOTPLUG_IO_LEN         24
 #define MEMORY_DEVICES_CONTAINER     "\\_SB.MHPC"
 
-static uint16_t memhp_io_base;
+static hwaddr memhp_io_base;
 
 static ACPIOSTInfo *acpi_memory_device_status(int slot, MemStatus *mdev)
 {
@@ -208,7 +208,7 @@ static const MemoryRegionOps acpi_memory_hotplug_ops = {
 };
 
 void acpi_memory_hotplug_init(MemoryRegion *as, Object *owner,
-                              MemHotplugState *state, uint16_t io_base)
+                              MemHotplugState *state, hwaddr io_base)
 {
     MachineState *machine = MACHINE(qdev_get_machine());
 
@@ -279,7 +279,9 @@ void acpi_memory_plug_cb(HotplugHandler *hotplug_dev, MemHotplugState *mem_st,
     mdev->is_enabled = true;
     if (dev->hotplugged) {
         mdev->is_inserting = true;
-        acpi_send_event(DEVICE(hotplug_dev), ACPI_MEMORY_HOTPLUG_STATUS);
+        if (!mem_st->hw_reduced_acpi) {
+            acpi_send_event(DEVICE(hotplug_dev), ACPI_MEMORY_HOTPLUG_STATUS);
+        }
     }
 }
 
@@ -341,7 +343,8 @@ const VMStateDescription vmstate_memory_hotplug = {
 
 void build_memory_hotplug_aml(Aml *table, uint32_t nr_mem,
                               const char *res_root,
-                              const char *event_handler_method)
+                              const char *event_handler_method,
+                              AmlRegionSpace rs)
 {
     int i;
     Aml *ifctx;
@@ -371,7 +374,7 @@ void build_memory_hotplug_aml(Aml *table, uint32_t nr_mem,
         aml_append(mem_ctrl_dev, aml_name_decl("_CRS", crs));
 
         aml_append(mem_ctrl_dev, aml_operation_region(
-            MEMORY_HOTPLUG_IO_REGION, AML_SYSTEM_IO,
+            MEMORY_HOTPLUG_IO_REGION, rs,
             aml_int(memhp_io_base), MEMORY_HOTPLUG_IO_LEN)
         );
 
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 2e21a31..b62c1a3 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1852,7 +1852,8 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
         build_cpus_aml(dsdt, machine, opts, pm->cpu_hp_io_base,
                        "\\_SB.PCI0", "\\_GPE._E02");
     }
-    build_memory_hotplug_aml(dsdt, nr_mem, "\\_SB.PCI0", "\\_GPE._E03");
+    build_memory_hotplug_aml(dsdt, nr_mem, "\\_SB.PCI0",
+                             "\\_GPE._E03", AML_SYSTEM_IO);
 
     scope =  aml_scope("_GPE");
     {
diff --git a/include/hw/acpi/memory_hotplug.h b/include/hw/acpi/memory_hotplug.h
index 77c6576..ec56579 100644
--- a/include/hw/acpi/memory_hotplug.h
+++ b/include/hw/acpi/memory_hotplug.h
@@ -26,10 +26,11 @@ typedef struct MemHotplugState {
     uint32_t selector;
     uint32_t dev_count;
     MemStatus *devs;
+    bool hw_reduced_acpi; /*true for hw reduced acpi platform */
 } MemHotplugState;
 
 void acpi_memory_hotplug_init(MemoryRegion *as, Object *owner,
-                              MemHotplugState *state, uint16_t io_base);
+                              MemHotplugState *state, hwaddr io_base);
 
 void acpi_memory_plug_cb(HotplugHandler *hotplug_dev, MemHotplugState *mem_st,
                          DeviceState *dev, Error **errp);
@@ -48,5 +49,6 @@ void acpi_memory_ospm_status(MemHotplugState *mem_st, ACPIOSTInfoList ***list);
 
 void build_memory_hotplug_aml(Aml *table, uint32_t nr_mem,
                               const char *res_root,
-                              const char *event_handler_method);
+                              const char *event_handler_method,
+                              AmlRegionSpace rs);
 #endif
-- 
2.7.4