fred.kon...@greensocs.com writes:
> From: KONRAD Frederic <fred.kon...@greensocs.com>
>
> Create the virtio-device which is abstract. All the virtio-device can extend
> this class. It also add some functions to virtio-bus.
>
> Signed-off-by: KONRAD Frederic <fred.kon...@greensocs.com>
> ---
> hw/virtio-bus.c | 35 +++++++++++++++++++++++++++++
> hw/virtio-bus.h | 7 ++++++
> hw/virtio.c | 70
> +++++++++++++++++++++++++++++++++++++++++++++++----------
> hw/virtio.h | 30 +++++++++++++++++++++++++
> 4 files changed, 130 insertions(+), 12 deletions(-)
>
> diff --git a/hw/virtio-bus.c b/hw/virtio-bus.c
> index 7813a89..ec43185 100644
> --- a/hw/virtio-bus.c
> +++ b/hw/virtio-bus.c
> @@ -127,6 +127,41 @@ size_t virtio_device_get_config_len(VirtioBusState *bus)
> return bus->vdev->config_len;
> }
>
> +/* Get the features of the plugged device. */
> +uint32_t virtio_device_get_features(VirtioBusState *bus,
> + uint32_t requested_features)
> +{
> + VirtioDeviceClass *k;
> + assert(bus->vdev != NULL);
> + k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
> + assert(k->get_features != NULL);
> + return k->get_features(bus->vdev, requested_features);
> +}
> +
> +/* Get bad features of the plugged device. */
> +uint32_t virtio_device_get_bad_features(VirtioBusState *bus)
> +{
> + VirtioDeviceClass *k;
> + assert(bus->vdev != NULL);
> + k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
> + if (k->bad_features != NULL) {
> + return k->bad_features(bus->vdev);
> + } else {
> + return 0;
> + }
> +}
> +
> +/* Get config of the plugged device. */
> +void virtio_device_get_config(VirtioBusState *bus, uint8_t *config)
> +{
> + VirtioDeviceClass *k;
> + assert(bus->vdev != NULL);
> + k = VIRTIO_DEVICE_GET_CLASS(bus->vdev);
> + if (k->get_config != NULL) {
> + k->get_config(bus->vdev, config);
> + }
> +}
> +
If the prefix is "virtio_device" the first argument should be a
VirtIODevice not a virtio_bus.
You probably should introduce a virtio_bus_get_vdev() and then call
virtio_device(virtio_bus_get_vdev(bus), ...)
Or alternatively, rename these to:
virtio_bus_get_vdev_*
> static const TypeInfo virtio_bus_info = {
> .name = TYPE_VIRTIO_BUS,
> .parent = TYPE_BUS,
> diff --git a/hw/virtio-bus.h b/hw/virtio-bus.h
> index 8aa71b2..7bea64a 100644
> --- a/hw/virtio-bus.h
> +++ b/hw/virtio-bus.h
> @@ -87,5 +87,12 @@ int virtio_device_get_nvectors(VirtioBusState *bus);
> void virtio_device_set_nvectors(VirtioBusState *bus, int nvectors);
> /* Get the config_len field of the plugged device. */
> size_t virtio_device_get_config_len(VirtioBusState *bus);
> +/* Get the features of the plugged device. */
> +uint32_t virtio_device_get_features(VirtioBusState *bus,
> + uint32_t requested_features);
> +/* Get bad features of the plugged device. */
> +uint32_t virtio_device_get_bad_features(VirtioBusState *bus);
> +/* Get config of the plugged device. */
> +void virtio_device_get_config(VirtioBusState *bus, uint8_t *config);
>
> #endif /* VIRTIO_BUS_H */
> diff --git a/hw/virtio.c b/hw/virtio.c
> index 77b53a9..ca170c3 100644
> --- a/hw/virtio.c
> +++ b/hw/virtio.c
> @@ -17,6 +17,7 @@
> #include "qemu/error-report.h"
> #include "virtio.h"
> #include "qemu/atomic.h"
> +#include "virtio-bus.h"
>
> /* The alignment to use between consumer and producer parts of vring.
> * x86 pagesize again. */
> @@ -875,11 +876,16 @@ int virtio_load(VirtIODevice *vdev, QEMUFile *f)
> return 0;
> }
>
> -void virtio_cleanup(VirtIODevice *vdev)
> +void virtio_common_cleanup(VirtIODevice *vdev)
> {
> qemu_del_vm_change_state_handler(vdev->vmstate);
> g_free(vdev->config);
> g_free(vdev->vq);
> +}
> +
> +void virtio_cleanup(VirtIODevice *vdev)
> +{
> + virtio_common_cleanup(vdev);
> g_free(vdev);
> }
>
> @@ -902,14 +908,10 @@ static void virtio_vmstate_change(void *opaque, int
> running, RunState state)
> }
> }
>
> -VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
> - size_t config_size, size_t struct_size)
> +void virtio_init(VirtIODevice *vdev, const char *name,
> + uint16_t device_id, size_t config_size)
> {
> - VirtIODevice *vdev;
> int i;
> -
> - vdev = g_malloc0(struct_size);
> -
> vdev->device_id = device_id;
> vdev->status = 0;
> vdev->isr = 0;
> @@ -917,20 +919,28 @@ VirtIODevice *virtio_common_init(const char *name,
> uint16_t device_id,
> vdev->config_vector = VIRTIO_NO_VECTOR;
> vdev->vq = g_malloc0(sizeof(VirtQueue) * VIRTIO_PCI_QUEUE_MAX);
> vdev->vm_running = runstate_is_running();
> - for(i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
> + for (i = 0; i < VIRTIO_PCI_QUEUE_MAX; i++) {
> vdev->vq[i].vector = VIRTIO_NO_VECTOR;
> vdev->vq[i].vdev = vdev;
> }
>
> vdev->name = name;
> vdev->config_len = config_size;
> - if (vdev->config_len)
> + if (vdev->config_len) {
> vdev->config = g_malloc0(config_size);
> - else
> + } else {
> vdev->config = NULL;
> + }
> + vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change,
> + vdev);
> +}
>
> - vdev->vmstate = qemu_add_vm_change_state_handler(virtio_vmstate_change,
> vdev);
> -
> +VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
> + size_t config_size, size_t struct_size)
> +{
> + VirtIODevice *vdev;
> + vdev = g_malloc0(struct_size);
> + virtio_init(vdev, name, device_id, config_size);
> return vdev;
> }
>
> @@ -1056,3 +1066,39 @@ EventNotifier
> *virtio_queue_get_host_notifier(VirtQueue *vq)
> {
> return &vq->host_notifier;
> }
> +
> +static int virtio_device_init(DeviceState *qdev)
> +{
> + VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
> + VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(qdev);
> + assert(k->init != NULL);
> + if (k->init(vdev) < 0) {
> + return -1;
> + }
> + virtio_bus_plug_device(vdev);
> + return 0;
> +}
> +
> +static void virtio_device_class_init(ObjectClass *klass, void *data)
> +{
> + /* Set the default value here. */
> + DeviceClass *dc = DEVICE_CLASS(klass);
> + dc->init = virtio_device_init;
> + dc->bus_type = TYPE_VIRTIO_BUS;
> +}
> +
> +static const TypeInfo virtio_device_info = {
> + .name = TYPE_VIRTIO_DEVICE,
> + .parent = TYPE_DEVICE,
> + .instance_size = sizeof(VirtIODevice),
> + .class_init = virtio_device_class_init,
> + .abstract = true,
> + .class_size = sizeof(VirtioDeviceClass),
> +};
> +
> +static void virtio_register_types(void)
> +{
> + type_register_static(&virtio_device_info);
> +}
> +
> +type_init(virtio_register_types)
> diff --git a/hw/virtio.h b/hw/virtio.h
> index 1dec9dc..a321fb2 100644
> --- a/hw/virtio.h
> +++ b/hw/virtio.h
> @@ -108,8 +108,17 @@ typedef struct {
>
> #define VIRTIO_NO_VECTOR 0xffff
>
> +#define TYPE_VIRTIO_DEVICE "virtio-device"
> +#define VIRTIO_DEVICE_GET_CLASS(obj) \
> + OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE)
> +#define VIRTIO_DEVICE_CLASS(klass) \
> + OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE)
> +#define VIRTIO_DEVICE(obj) \
> + OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE)
> +
> struct VirtIODevice
> {
> + DeviceState parent_obj;
> const char *name;
> uint8_t status;
> uint8_t isr;
> @@ -119,6 +128,10 @@ struct VirtIODevice
> void *config;
> uint16_t config_vector;
> int nvectors;
> + /*
> + * Function pointers will be removed at the end of the series as they
> are in
> + * VirtioDeviceClass.
> + */
> uint32_t (*get_features)(VirtIODevice *vdev, uint32_t
> requested_features);
> uint32_t (*bad_features)(VirtIODevice *vdev);
> void (*set_features)(VirtIODevice *vdev, uint32_t val);
> @@ -134,6 +147,23 @@ struct VirtIODevice
> VMChangeStateEntry *vmstate;
> };
>
> +typedef struct {
It's good form to not make this an anonymous struct.
Regards,
Anthony Liguori
> + /* This is what a VirtioDevice must implement */
> + DeviceClass parent;
> + int (*init)(VirtIODevice *vdev);
> + uint32_t (*get_features)(VirtIODevice *vdev, uint32_t
> requested_features);
> + uint32_t (*bad_features)(VirtIODevice *vdev);
> + void (*set_features)(VirtIODevice *vdev, uint32_t val);
> + void (*get_config)(VirtIODevice *vdev, uint8_t *config);
> + void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
> + void (*reset)(VirtIODevice *vdev);
> + void (*set_status)(VirtIODevice *vdev, uint8_t val);
> +} VirtioDeviceClass;
> +
> +void virtio_init(VirtIODevice *vdev, const char *name,
> + uint16_t device_id, size_t config_size);
> +void virtio_common_cleanup(VirtIODevice *vdev);
> +
> VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
> void (*handle_output)(VirtIODevice *,
> VirtQueue *));
> --
> 1.7.11.7
