[Qemu-devel] [PATCH v2 04/10] pc: acpi: introduce AcpiDeviceIfClass.madt_cpu hook

[Igor Mammedov <imammedo@redhat.com>]

Add madt_cpu callback to AcpiDeviceIfClass and use
it for generating LAPIC MADT entries for CPUs.

Later it will be used for generating x2APIC
entries in case of more than 255 CPUs and also
would be reused by ARM target when ACPI CPU hotplug
is introduced there.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 hw/acpi/piix4.c                      |  1 +
 hw/i386/acpi-build.c                 | 45 +++++++++++++++++++++---------------
 hw/isa/lpc_ich9.c                    |  1 +
 include/hw/acpi/acpi_dev_interface.h |  7 ++++++
 include/hw/i386/pc.h                 |  5 ++++
 stubs/Makefile.objs                  |  1 +
 stubs/pc_madt_cpu_entry.c            |  7 ++++++
 7 files changed, 49 insertions(+), 18 deletions(-)
 create mode 100644 stubs/pc_madt_cpu_entry.c

diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index 6351d2e..6d24cb5 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -658,6 +658,7 @@ static void piix4_pm_class_init(ObjectClass *klass, void *data)
     hc->unplug = piix4_device_unplug_cb;
     adevc->ospm_status = piix4_ospm_status;
     adevc->send_event = piix4_send_gpe;
+    adevc->madt_cpu = pc_madt_cpu_entry;
 }
 
 static const TypeInfo piix4_pm_info = {
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 8ca2032..3e1afe2 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -327,12 +327,38 @@ build_fadt(GArray *table_data, BIOSLinker *linker, AcpiPmInfo *pm,
                  (void *)fadt, "FACP", sizeof(*fadt), 1, oem_id, oem_table_id);
 }
 
+void pc_madt_cpu_entry(AcpiDeviceIf *adev, int uid,
+                       CPUArchIdList *apic_ids, GArray *entry)
+{
+    int apic_id;
+    AcpiMadtProcessorApic *apic = acpi_data_push(entry, sizeof *apic);
+
+    apic_id = apic_ids->cpus[uid].arch_id;
+    apic->type = ACPI_APIC_PROCESSOR;
+    apic->length = sizeof(*apic);
+    apic->processor_id = uid;
+    apic->local_apic_id = apic_id;
+    if (apic_ids->cpus[uid].cpu != NULL) {
+        apic->flags = cpu_to_le32(1);
+    } else {
+        /* ACPI spec says that LAPIC entry for non present
+         * CPU may be omitted from MADT or it must be marked
+         * as disabled. However omitting non present CPU from
+         * MADT breaks hotplug on linux. So possible CPUs
+         * should be put in MADT but kept disabled.
+         */
+        apic->flags = cpu_to_le32(0);
+    }
+}
+
 static void
 build_madt(GArray *table_data, BIOSLinker *linker, PCMachineState *pcms)
 {
     MachineClass *mc = MACHINE_GET_CLASS(pcms);
     CPUArchIdList *apic_ids = mc->possible_cpu_arch_ids(MACHINE(pcms));
     int madt_start = table_data->len;
+    AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(pcms->acpi_dev);
+    AcpiDeviceIf *adev = ACPI_DEVICE_IF(pcms->acpi_dev);
 
     AcpiMultipleApicTable *madt;
     AcpiMadtIoApic *io_apic;
@@ -345,24 +371,7 @@ build_madt(GArray *table_data, BIOSLinker *linker, PCMachineState *pcms)
     madt->flags = cpu_to_le32(1);
 
     for (i = 0; i < apic_ids->len; i++) {
-        AcpiMadtProcessorApic *apic = acpi_data_push(table_data, sizeof *apic);
-        int apic_id = apic_ids->cpus[i].arch_id;
-
-        apic->type = ACPI_APIC_PROCESSOR;
-        apic->length = sizeof(*apic);
-        apic->processor_id = i;
-        apic->local_apic_id = apic_id;
-        if (apic_ids->cpus[i].cpu != NULL) {
-            apic->flags = cpu_to_le32(1);
-        } else {
-            /* ACPI spec says that LAPIC entry for non present
-             * CPU may be omitted from MADT or it must be marked
-             * as disabled. However omitting non present CPU from
-             * MADT breaks hotplug on linux. So possible CPUs
-             * should be put in MADT but kept disabled.
-             */
-            apic->flags = cpu_to_le32(0);
-        }
+        adevc->madt_cpu(adev, i, apic_ids, table_data);
     }
     g_free(apic_ids);
 
diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c
index 213741b..c1a4f1b 100644
--- a/hw/isa/lpc_ich9.c
+++ b/hw/isa/lpc_ich9.c
@@ -714,6 +714,7 @@ static void ich9_lpc_class_init(ObjectClass *klass, void *data)
     hc->unplug = ich9_pm_device_unplug_cb;
     adevc->ospm_status = ich9_pm_ospm_status;
     adevc->send_event = ich9_send_gpe;
+    adevc->madt_cpu = pc_madt_cpu_entry;
 }
 
 static const TypeInfo ich9_lpc_info = {
diff --git a/include/hw/acpi/acpi_dev_interface.h b/include/hw/acpi/acpi_dev_interface.h
index a0c4a33..da4ef7f 100644
--- a/include/hw/acpi/acpi_dev_interface.h
+++ b/include/hw/acpi/acpi_dev_interface.h
@@ -3,6 +3,7 @@
 
 #include "qom/object.h"
 #include "qapi-types.h"
+#include "hw/boards.h"
 
 /* These values are part of guest ABI, and can not be changed */
 typedef enum {
@@ -37,6 +38,10 @@ void acpi_send_event(DeviceState *dev, AcpiEventStatusBits event);
  * ospm_status: returns status of ACPI device objects, reported
  *              via _OST method if device supports it.
  * send_event: inject a specified event into guest
+ * madt_cpu: fills @entry with Interrupt Controller Structure
+ *           for CPU indexed by @uid in @apic_ids array,
+ *           returned structure types are:
+ *           0 - Local APIC, 9 - Local x2APIC, 0xB - GICC
  *
  * Interface is designed for providing unified interface
  * to generic ACPI functionality that could be used without
@@ -50,5 +55,7 @@ typedef struct AcpiDeviceIfClass {
     /* <public> */
     void (*ospm_status)(AcpiDeviceIf *adev, ACPIOSTInfoList ***list);
     void (*send_event)(AcpiDeviceIf *adev, AcpiEventStatusBits ev);
+    void (*madt_cpu)(AcpiDeviceIf *adev, int uid,
+                     CPUArchIdList *apic_ids, GArray *entry);
 } AcpiDeviceIfClass;
 #endif
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 49566c8..9e23929 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -17,6 +17,7 @@
 #include "hw/compat.h"
 #include "hw/mem/pc-dimm.h"
 #include "hw/mem/nvdimm.h"
+#include "hw/acpi/acpi_dev_interface.h"
 
 #define HPET_INTCAP "hpet-intcap"
 
@@ -345,6 +346,10 @@ void pc_system_firmware_init(MemoryRegion *rom_memory,
 /* pvpanic.c */
 uint16_t pvpanic_port(void);
 
+/* acpi-build.c */
+void pc_madt_cpu_entry(AcpiDeviceIf *adev, int uid,
+                       CPUArchIdList *apic_ids, GArray *entry);
+
 /* e820 types */
 #define E820_RAM        1
 #define E820_RESERVED   2
diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index 4b258a6..e8ff38d 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -41,3 +41,4 @@ stub-obj-y += target-monitor-defs.o
 stub-obj-y += target-get-monitor-def.o
 stub-obj-y += vhost.o
 stub-obj-y += iohandler.o
+stub-obj-y += pc_madt_cpu_entry.o
diff --git a/stubs/pc_madt_cpu_entry.c b/stubs/pc_madt_cpu_entry.c
new file mode 100644
index 0000000..427e772
--- /dev/null
+++ b/stubs/pc_madt_cpu_entry.c
@@ -0,0 +1,7 @@
+#include "qemu/osdep.h"
+#include "hw/i386/pc.h"
+
+void pc_madt_cpu_entry(AcpiDeviceIf *adev, int uid,
+                       CPUArchIdList *apic_ids, GArray *entry)
+{
+}
-- 
1.8.3.1