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i2c:smbus_eeprom: Add vmstate handling to the smbus eeprom 

Transfer the state of the EEPROM on a migration.  This way the
data remains consistent on migration.

This required moving the actual data to a separate array and
using the data provided in the init function as a separate
initialization array, since a pointer property has to be a
void * and the array needs to be uint8_t[].

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Corey Minyard 2017-12-07 15:40:53 -06:00
parent 0cf487e5bd
commit fd9df33f08
1 changed files with 32 additions and 2 deletions
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34
hw/i2c/smbus_eeprom.c
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@ -26,6 +26,7 @@
#include "qemu/units.h"
#include "qapi/error.h"
#include "hw/hw.h"
#include "hw/boards.h"
#include "hw/i2c/i2c.h"
#include "hw/i2c/smbus_slave.h"
#include "hw/i2c/smbus_eeprom.h"
@ -41,8 +42,10 @@
typedef struct SMBusEEPROMDevice {
SMBusDevice smbusdev;
void *data;
uint8_t data[SMBUS_EEPROM_SIZE];
void *init_data;
uint8_t offset;
bool accessed;
} SMBusEEPROMDevice;
static uint8_t eeprom_receive_byte(SMBusDevice *dev)
@ -51,6 +54,7 @@ static uint8_t eeprom_receive_byte(SMBusDevice *dev)
uint8_t *data = eeprom->data;
uint8_t val = data[eeprom->offset++];
eeprom->accessed = true;
#ifdef DEBUG
printf("eeprom_receive_byte: addr=0x%02x val=0x%02x\n",
dev->i2c.address, val);
@ -63,6 +67,7 @@ static int eeprom_write_data(SMBusDevice *dev, uint8_t *buf, uint8_t len)
SMBusEEPROMDevice *eeprom = SMBUS_EEPROM(dev);
uint8_t *data = eeprom->data;
eeprom->accessed = true;
#ifdef DEBUG
printf("eeprom_write_byte: addr=0x%02x cmd=0x%02x val=0x%02x\n",
dev->i2c.address, buf[0], buf[1]);
@ -80,15 +85,39 @@ static int eeprom_write_data(SMBusDevice *dev, uint8_t *buf, uint8_t len)
return 0;
}
static bool smbus_eeprom_vmstate_needed(void *opaque)
{
MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
SMBusEEPROMDevice *eeprom = opaque;
return (eeprom->accessed || smbus_vmstate_needed(&eeprom->smbusdev)) &&
!mc->smbus_no_migration_support;
}
static const VMStateDescription vmstate_smbus_eeprom = {
.name = "smbus-eeprom",
.version_id = 1,
.minimum_version_id = 1,
.needed = smbus_eeprom_vmstate_needed,
.fields = (VMStateField[]) {
VMSTATE_SMBUS_DEVICE(smbusdev, SMBusEEPROMDevice),
VMSTATE_UINT8_ARRAY(data, SMBusEEPROMDevice, SMBUS_EEPROM_SIZE),
VMSTATE_UINT8(offset, SMBusEEPROMDevice),
VMSTATE_BOOL(accessed, SMBusEEPROMDevice),
VMSTATE_END_OF_LIST()
}
};
static void smbus_eeprom_realize(DeviceState *dev, Error **errp)
{
SMBusEEPROMDevice *eeprom = SMBUS_EEPROM(dev);
memcpy(eeprom->data, eeprom->init_data, SMBUS_EEPROM_SIZE);
eeprom->offset = 0;
}
static Property smbus_eeprom_properties[] = {
DEFINE_PROP_PTR("data", SMBusEEPROMDevice, data),
DEFINE_PROP_PTR("data", SMBusEEPROMDevice, init_data),
DEFINE_PROP_END_OF_LIST(),
};
@ -101,6 +130,7 @@ static void smbus_eeprom_class_initfn(ObjectClass *klass, void *data)
sc->receive_byte = eeprom_receive_byte;
sc->write_data = eeprom_write_data;
dc->props = smbus_eeprom_properties;
dc->vmsd = &vmstate_smbus_eeprom;
/* Reason: pointer property "data" */
dc->user_creatable = false;
}