[PATCH RFC V2 16/37] hw/acpi: Update CPUs AML with cpu-(ctrl)dev change

[Salil Mehta via <qemu-devel@nongnu.org>]

CPUs Control device(\\_SB.PCI0) register interface for the x86 arch is based on
PCI and is IO port based and hence existing cpus AML code assumes _CRS objects
would evaluate to a system resource which describes IO Port address. But on ARM
arch CPUs control device(\\_SB.PRES) register interface is memory-mapped hence
_CRS object should evaluate to system resource which describes memory-mapped
base address.

This cpus AML code change updates the existing inerface of the build cpus AML
function to accept both IO/MEMORY type regions and update the _CRS object
correspondingly.

NOTE: Beside above CPU scan shall be triggered when OSPM evaluates _EVT method
      part of the GED framework which is covered in subsequent patch.

Co-developed-by: Salil Mehta <salil.mehta@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Co-developed-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
---
 hw/acpi/cpu.c         | 23 ++++++++++++++++-------
 hw/i386/acpi-build.c  |  2 +-
 include/hw/acpi/cpu.h |  5 +++--
 3 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/hw/acpi/cpu.c b/hw/acpi/cpu.c
index d5ba37b209..232720992d 100644
--- a/hw/acpi/cpu.c
+++ b/hw/acpi/cpu.c
@@ -341,9 +341,10 @@ const VMStateDescription vmstate_cpu_hotplug = {
 #define CPU_FW_EJECT_EVENT "CEJF"
 
 void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
-                    hwaddr io_base,
+                    hwaddr base_addr,
                     const char *res_root,
-                    const char *event_handler_method)
+                    const char *event_handler_method,
+                    AmlRegionSpace rs)
 {
     Aml *ifctx;
     Aml *field;
@@ -370,13 +371,19 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
         aml_append(cpu_ctrl_dev, aml_mutex(CPU_LOCK, 0));
 
         crs = aml_resource_template();
-        aml_append(crs, aml_io(AML_DECODE16, io_base, io_base, 1,
+        if (rs == AML_SYSTEM_IO) {
+            aml_append(crs, aml_io(AML_DECODE16, base_addr, base_addr, 1,
                                ACPI_CPU_HOTPLUG_REG_LEN));
+        } else {
+            aml_append(crs, aml_memory32_fixed(base_addr,
+                               ACPI_CPU_HOTPLUG_REG_LEN, AML_READ_WRITE));
+        }
+
         aml_append(cpu_ctrl_dev, aml_name_decl("_CRS", crs));
 
         /* declare CPU hotplug MMIO region with related access fields */
         aml_append(cpu_ctrl_dev,
-            aml_operation_region("PRST", AML_SYSTEM_IO, aml_int(io_base),
+            aml_operation_region("PRST", rs, aml_int(base_addr),
                                  ACPI_CPU_HOTPLUG_REG_LEN));
 
         field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK,
@@ -702,9 +709,11 @@ void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
     aml_append(sb_scope, cpus_dev);
     aml_append(table, sb_scope);
 
-    method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
-    aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
-    aml_append(table, method);
+    if (event_handler_method) {
+        method = aml_method(event_handler_method, 0, AML_NOTSERIALIZED);
+        aml_append(method, aml_call0("\\_SB.CPUS." CPU_SCAN_METHOD));
+        aml_append(table, method);
+    }
 
     g_free(cphp_res_path);
 }
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index bb12b0ad43..560f108d38 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1550,7 +1550,7 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
             .fw_unplugs_cpu = pm->smi_on_cpu_unplug,
         };
         build_cpus_aml(dsdt, machine, opts, pm->cpu_hp_io_base,
-                       "\\_SB.PCI0", "\\_GPE._E02");
+                       "\\_SB.PCI0", "\\_GPE._E02", AML_SYSTEM_IO);
     }
 
     if (pcms->memhp_io_base && nr_mem) {
diff --git a/include/hw/acpi/cpu.h b/include/hw/acpi/cpu.h
index 999caaf510..b87ebfdf4b 100644
--- a/include/hw/acpi/cpu.h
+++ b/include/hw/acpi/cpu.h
@@ -56,9 +56,10 @@ typedef struct CPUHotplugFeatures {
 } CPUHotplugFeatures;
 
 void build_cpus_aml(Aml *table, MachineState *machine, CPUHotplugFeatures opts,
-                    hwaddr io_base,
+                    hwaddr base_addr,
                     const char *res_root,
-                    const char *event_handler_method);
+                    const char *event_handler_method,
+                    AmlRegionSpace rs);
 
 void acpi_cpu_ospm_status(CPUHotplugState *cpu_st, ACPIOSTInfoList ***list);
 
-- 
2.34.1