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[Qemu-devel] [RESEND PATCH v8 3/4] cpu/apic: drop icc bus/bridge


From: Zhu Guihua
Subject: [Qemu-devel] [RESEND PATCH v8 3/4] cpu/apic: drop icc bus/bridge
Date: Thu, 25 Jun 2015 10:17:10 +0800

From: Chen Fan <address@hidden>

After CPU hotplug has been converted to BUS-less hot-plug infrastructure,
the only function ICC bus performs is to propagate reset to LAPICs. However
LAPIC could be reset by registering its reset handler after all device are
initialized.
Do so and drop ~200LOC of not needed anymore ICCBus related code.

Signed-off-by: Chen Fan <address@hidden>
Signed-off-by: Zhu Guihua <address@hidden>
---
 hw/i386/pc.c                    | 24 +++++++++---------------
 hw/i386/pc_piix.c               |  9 +--------
 hw/i386/pc_q35.c                |  9 +--------
 hw/intc/apic_common.c           |  5 ++---
 include/hw/i386/apic_internal.h |  7 ++++---
 include/hw/i386/pc.h            |  2 +-
 target-i386/cpu.c               | 23 +++++++++++++++--------
 target-i386/cpu.h               |  1 +
 8 files changed, 34 insertions(+), 46 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 9f16128..c547d74 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -59,7 +59,6 @@
 #include "qemu/error-report.h"
 #include "hw/acpi/acpi.h"
 #include "hw/acpi/cpu_hotplug.h"
-#include "hw/cpu/icc_bus.h"
 #include "hw/boards.h"
 #include "hw/pci/pci_host.h"
 #include "acpi-build.h"
@@ -969,27 +968,25 @@ void pc_acpi_smi_interrupt(void *opaque, int irq, int 
level)
     }
 }
 
+#define x86_cpu_apic_reset_order 0x1
+
 static X86CPU *pc_new_cpu(const char *cpu_model, int64_t apic_id,
-                          DeviceState *icc_bridge, Error **errp)
+                          Error **errp)
 {
     X86CPU *cpu = NULL;
     Error *local_err = NULL;
 
-    if (icc_bridge == NULL) {
-        error_setg(&local_err, "Invalid icc-bridge value");
-        goto out;
-    }
-
     cpu = cpu_x86_create(cpu_model, &local_err);
     if (local_err != NULL) {
         goto out;
     }
 
-    qdev_set_parent_bus(DEVICE(cpu), qdev_get_child_bus(icc_bridge, "icc"));
-
     object_property_set_int(OBJECT(cpu), apic_id, "apic-id", &local_err);
     object_property_set_bool(OBJECT(cpu), true, "realized", &local_err);
 
+    qemu_register_reset_common(x86_cpu_apic_reset, cpu,
+                               x86_cpu_apic_reset_order);
+
 out:
     if (local_err) {
         error_propagate(errp, local_err);
@@ -1003,7 +1000,6 @@ static const char *current_cpu_model;
 
 void pc_hot_add_cpu(const int64_t id, Error **errp)
 {
-    DeviceState *icc_bridge;
     X86CPU *cpu;
     int64_t apic_id = x86_cpu_apic_id_from_index(id);
     Error *local_err = NULL;
@@ -1032,9 +1028,7 @@ void pc_hot_add_cpu(const int64_t id, Error **errp)
         return;
     }
 
-    icc_bridge = DEVICE(object_resolve_path_type("icc-bridge",
-                                                 TYPE_ICC_BRIDGE, NULL));
-    cpu = pc_new_cpu(current_cpu_model, apic_id, icc_bridge, &local_err);
+    cpu = pc_new_cpu(current_cpu_model, apic_id, &local_err);
     if (local_err) {
         error_propagate(errp, local_err);
         return;
@@ -1042,7 +1036,7 @@ void pc_hot_add_cpu(const int64_t id, Error **errp)
     object_unref(OBJECT(cpu));
 }
 
-void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge)
+void pc_cpus_init(const char *cpu_model)
 {
     int i;
     X86CPU *cpu = NULL;
@@ -1068,7 +1062,7 @@ void pc_cpus_init(const char *cpu_model, DeviceState 
*icc_bridge)
 
     for (i = 0; i < smp_cpus; i++) {
         cpu = pc_new_cpu(cpu_model, x86_cpu_apic_id_from_index(i),
-                         icc_bridge, &error);
+                         &error);
         if (error) {
             error_report_err(error);
             exit(1);
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index e142f75..7e9a185 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -39,7 +39,6 @@
 #include "hw/kvm/clock.h"
 #include "sysemu/sysemu.h"
 #include "hw/sysbus.h"
-#include "hw/cpu/icc_bus.h"
 #include "sysemu/arch_init.h"
 #include "sysemu/block-backend.h"
 #include "hw/i2c/smbus.h"
@@ -98,7 +97,6 @@ static void pc_init1(MachineState *machine)
     MemoryRegion *ram_memory;
     MemoryRegion *pci_memory;
     MemoryRegion *rom_memory;
-    DeviceState *icc_bridge;
     PcGuestInfo *guest_info;
     ram_addr_t lowmem;
 
@@ -142,11 +140,7 @@ static void pc_init1(MachineState *machine)
         exit(1);
     }
 
-    icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
-    object_property_add_child(qdev_get_machine(), "icc-bridge",
-                              OBJECT(icc_bridge), NULL);
-
-    pc_cpus_init(machine->cpu_model, icc_bridge);
+    pc_cpus_init(machine->cpu_model);
 
     if (kvm_enabled() && kvmclock_enabled) {
         kvmclock_create();
@@ -229,7 +223,6 @@ static void pc_init1(MachineState *machine)
     if (pci_enabled) {
         ioapic_init_gsi(gsi_state, "i440fx");
     }
-    qdev_init_nofail(icc_bridge);
 
     pc_register_ferr_irq(gsi[13]);
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 082cd93..9af1d06 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -43,7 +43,6 @@
 #include "hw/ide/pci.h"
 #include "hw/ide/ahci.h"
 #include "hw/usb.h"
-#include "hw/cpu/icc_bus.h"
 #include "qemu/error-report.h"
 #include "migration/migration.h"
 
@@ -85,7 +84,6 @@ static void pc_q35_init(MachineState *machine)
     int i;
     ICH9LPCState *ich9_lpc;
     PCIDevice *ahci;
-    DeviceState *icc_bridge;
     PcGuestInfo *guest_info;
     ram_addr_t lowmem;
     DriveInfo *hd[MAX_SATA_PORTS];
@@ -133,11 +131,7 @@ static void pc_q35_init(MachineState *machine)
         exit(1);
     }
 
-    icc_bridge = qdev_create(NULL, TYPE_ICC_BRIDGE);
-    object_property_add_child(qdev_get_machine(), "icc-bridge",
-                              OBJECT(icc_bridge), NULL);
-
-    pc_cpus_init(machine->cpu_model, icc_bridge);
+    pc_cpus_init(machine->cpu_model);
     pc_acpi_init("q35-acpi-dsdt.aml");
 
     kvmclock_create();
@@ -239,7 +233,6 @@ static void pc_q35_init(MachineState *machine)
     if (pci_enabled) {
         ioapic_init_gsi(gsi_state, "q35");
     }
-    qdev_init_nofail(icc_bridge);
 
     pc_register_ferr_irq(gsi[13]);
 
diff --git a/hw/intc/apic_common.c b/hw/intc/apic_common.c
index cf105f5..f4c7f08 100644
--- a/hw/intc/apic_common.c
+++ b/hw/intc/apic_common.c
@@ -427,13 +427,12 @@ static Property apic_properties_common[] = {
 
 static void apic_common_class_init(ObjectClass *klass, void *data)
 {
-    ICCDeviceClass *idc = ICC_DEVICE_CLASS(klass);
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->vmsd = &vmstate_apic_common;
     dc->reset = apic_reset_common;
     dc->props = apic_properties_common;
-    idc->realize = apic_common_realize;
+    dc->realize = apic_common_realize;
     /*
      * Reason: APIC and CPU need to be wired up by
      * x86_cpu_apic_create()
@@ -443,7 +442,7 @@ static void apic_common_class_init(ObjectClass *klass, void 
*data)
 
 static const TypeInfo apic_common_type = {
     .name = TYPE_APIC_COMMON,
-    .parent = TYPE_ICC_DEVICE,
+    .parent = TYPE_DEVICE,
     .instance_size = sizeof(APICCommonState),
     .class_size = sizeof(APICCommonClass),
     .class_init = apic_common_class_init,
diff --git a/include/hw/i386/apic_internal.h b/include/hw/i386/apic_internal.h
index dc7a89d..08d6f9b 100644
--- a/include/hw/i386/apic_internal.h
+++ b/include/hw/i386/apic_internal.h
@@ -21,7 +21,6 @@
 #define QEMU_APIC_INTERNAL_H
 
 #include "exec/memory.h"
-#include "hw/cpu/icc_bus.h"
 #include "qemu/timer.h"
 
 /* APIC Local Vector Table */
@@ -78,7 +77,7 @@ typedef struct APICCommonState APICCommonState;
 
 typedef struct APICCommonClass
 {
-    ICCDeviceClass parent_class;
+    DeviceClass parent_class;
 
     DeviceRealize realize;
     void (*set_base)(APICCommonState *s, uint64_t val);
@@ -93,7 +92,9 @@ typedef struct APICCommonClass
 } APICCommonClass;
 
 struct APICCommonState {
-    ICCDevice busdev;
+    /*< private >*/
+    DeviceState parent_obj;
+    /*< public >*/
 
     MemoryRegion io_memory;
     X86CPU *cpu;
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 86c5651..832f68c 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -161,7 +161,7 @@ extern int fd_bootchk;
 void pc_register_ferr_irq(qemu_irq irq);
 void pc_acpi_smi_interrupt(void *opaque, int irq, int level);
 
-void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge);
+void pc_cpus_init(const char *cpu_model);
 void pc_hot_add_cpu(const int64_t id, Error **errp);
 void pc_acpi_init(const char *default_dsdt);
 
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 1fb88f6..e169ce3 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -43,7 +43,6 @@
 
 #include "sysemu/sysemu.h"
 #include "hw/qdev-properties.h"
-#include "hw/cpu/icc_bus.h"
 #ifndef CONFIG_USER_ONLY
 #include "exec/address-spaces.h"
 #include "hw/xen/xen.h"
@@ -2719,7 +2718,6 @@ static void mce_init(X86CPU *cpu)
 #ifndef CONFIG_USER_ONLY
 static void x86_cpu_apic_create(X86CPU *cpu, Error **errp)
 {
-    DeviceState *dev = DEVICE(cpu);
     APICCommonState *apic;
     const char *apic_type = "apic";
 
@@ -2729,11 +2727,7 @@ static void x86_cpu_apic_create(X86CPU *cpu, Error 
**errp)
         apic_type = "xen-apic";
     }
 
-    cpu->apic_state = qdev_try_create(qdev_get_parent_bus(dev), apic_type);
-    if (cpu->apic_state == NULL) {
-        error_setg(errp, "APIC device '%s' could not be created", apic_type);
-        return;
-    }
+    cpu->apic_state = DEVICE(object_new(apic_type));
 
     object_property_add_child(OBJECT(cpu), "apic",
                               OBJECT(cpu->apic_state), NULL);
@@ -2754,6 +2748,20 @@ static void x86_cpu_apic_realize(X86CPU *cpu, Error 
**errp)
                              errp);
 }
 
+void x86_cpu_apic_reset(void *opaque)
+{
+    X86CPU *cpu = opaque;
+    DeviceClass *dc;
+
+    if (cpu->apic_state) {
+        dc = DEVICE_GET_CLASS(cpu->apic_state);
+
+        if (dc->reset != NULL) {
+            (*dc->reset)(cpu->apic_state);
+        }
+    }
+}
+
 static void x86_cpu_machine_done(Notifier *n, void *unused)
 {
     X86CPU *cpu = container_of(n, X86CPU, machine_done);
@@ -3136,7 +3144,6 @@ static void x86_cpu_common_class_init(ObjectClass *oc, 
void *data)
 
     xcc->parent_realize = dc->realize;
     dc->realize = x86_cpu_realizefn;
-    dc->bus_type = TYPE_ICC_BUS;
     dc->props = x86_cpu_properties;
 
     xcc->parent_reset = cc->reset;
diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 603aaf0..94f646d 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -1117,6 +1117,7 @@ void x86_stl_phys_notdirty(CPUState *cs, hwaddr addr, 
uint32_t val);
 void x86_stw_phys(CPUState *cs, hwaddr addr, uint32_t val);
 void x86_stl_phys(CPUState *cs, hwaddr addr, uint32_t val);
 void x86_stq_phys(CPUState *cs, hwaddr addr, uint64_t val);
+void x86_cpu_apic_reset(void *opaque);
 #endif
 
 static inline bool hw_local_breakpoint_enabled(unsigned long dr7, int index)
-- 
1.9.3




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