[Qemu-devel] [PATCH v2 07/12] i2c:pm_smbus: Fix state transfer

[minyard@acm.org]

From: Corey Minyard <cminyard@mvista.com>

Transfer the state information for the SMBus registers and
internal data so it will work on a VM transfer.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 hw/acpi/piix4.c           |  3 ++-
 hw/i2c/pm_smbus.c         | 31 +++++++++++++++++++++++++++++++
 hw/i2c/smbus_ich9.c       |  6 ++++--
 include/hw/i2c/pm_smbus.h |  2 ++
 4 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c
index e330f24c71..313305f5a0 100644
--- a/hw/acpi/piix4.c
+++ b/hw/acpi/piix4.c
@@ -309,7 +309,7 @@ static const VMStateDescription vmstate_cpuhp_state = {
  */
 static const VMStateDescription vmstate_acpi = {
     .name = "piix4_pm",
-    .version_id = 3,
+    .version_id = 4,
     .minimum_version_id = 3,
     .minimum_version_id_old = 1,
     .load_state_old = acpi_load_old,
@@ -320,6 +320,7 @@ static const VMStateDescription vmstate_acpi = {
         VMSTATE_UINT16(ar.pm1.evt.en, PIIX4PMState),
         VMSTATE_UINT16(ar.pm1.cnt.cnt, PIIX4PMState),
         VMSTATE_STRUCT(apm, PIIX4PMState, 0, vmstate_apm, APMState),
+        VMSTATE_STRUCT(smb, PIIX4PMState, 4, pmsmb_vmstate, PMSMBus),
         VMSTATE_TIMER_PTR(ar.tmr.timer, PIIX4PMState),
         VMSTATE_INT64(ar.tmr.overflow_time, PIIX4PMState),
         VMSTATE_STRUCT(ar.gpe, PIIX4PMState, 2, vmstate_gpe, ACPIGPE),
diff --git a/hw/i2c/pm_smbus.c b/hw/i2c/pm_smbus.c
index 8793113c25..75907e1c22 100644
--- a/hw/i2c/pm_smbus.c
+++ b/hw/i2c/pm_smbus.c
@@ -19,6 +19,7 @@
  */
 #include "qemu/osdep.h"
 #include "hw/hw.h"
+#include "hw/boards.h"
 #include "hw/i2c/pm_smbus.h"
 #include "hw/i2c/smbus_master.h"
 
@@ -450,6 +451,36 @@ static const MemoryRegionOps pm_smbus_ops = {
     .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
+static bool pm_smbus_vmstate_needed(void *opaque)
+{
+    MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
+
+    return !mc->smbus_no_migration_support;
+}
+
+const VMStateDescription pmsmb_vmstate = {
+    .name = "pmsmb",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = pm_smbus_vmstate_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT8(smb_stat, PMSMBus),
+        VMSTATE_UINT8(smb_ctl, PMSMBus),
+        VMSTATE_UINT8(smb_cmd, PMSMBus),
+        VMSTATE_UINT8(smb_addr, PMSMBus),
+        VMSTATE_UINT8(smb_data0, PMSMBus),
+        VMSTATE_UINT8(smb_data1, PMSMBus),
+        VMSTATE_UINT32(smb_index, PMSMBus),
+        VMSTATE_UINT8_ARRAY(smb_data, PMSMBus, PM_SMBUS_MAX_MSG_SIZE),
+        VMSTATE_UINT8(smb_auxctl, PMSMBus),
+        VMSTATE_BOOL(i2c_enable, PMSMBus),
+        VMSTATE_BOOL(op_done, PMSMBus),
+        VMSTATE_BOOL(in_i2c_block_read, PMSMBus),
+        VMSTATE_BOOL(start_transaction_on_status_read, PMSMBus),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 void pm_smbus_init(DeviceState *parent, PMSMBus *smb, bool force_aux_blk)
 {
     smb->op_done = true;
diff --git a/hw/i2c/smbus_ich9.c b/hw/i2c/smbus_ich9.c
index e6d8d28194..c9b7482a54 100644
--- a/hw/i2c/smbus_ich9.c
+++ b/hw/i2c/smbus_ich9.c
@@ -45,10 +45,12 @@ typedef struct ICH9SMBState {
 
 static const VMStateDescription vmstate_ich9_smbus = {
     .name = "ich9_smb",
-    .version_id = 1,
+    .version_id = 2,
     .minimum_version_id = 1,
     .fields = (VMStateField[]) {
-        VMSTATE_PCI_DEVICE(dev, struct ICH9SMBState),
+        VMSTATE_PCI_DEVICE(dev, ICH9SMBState),
+        VMSTATE_BOOL_V(irq_enabled, ICH9SMBState, 2),
+        VMSTATE_STRUCT(smb, ICH9SMBState, 2, pmsmb_vmstate, PMSMBus),
         VMSTATE_END_OF_LIST()
     }
 };
diff --git a/include/hw/i2c/pm_smbus.h b/include/hw/i2c/pm_smbus.h
index 7bcca97672..5075fc64fa 100644
--- a/include/hw/i2c/pm_smbus.h
+++ b/include/hw/i2c/pm_smbus.h
@@ -43,4 +43,6 @@ typedef struct PMSMBus {
 
 void pm_smbus_init(DeviceState *parent, PMSMBus *smb, bool force_aux_blk);
 
+extern const VMStateDescription pmsmb_vmstate;
+
 #endif /* PM_SMBUS_H */
-- 
2.17.1