blob: 0c4354e3e70169ec072e16da0919936647d1d351 [file] [log] [blame]
/*
* VFIO based AP matrix device assignment
*
* Copyright 2018 IBM Corp.
* Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
* Halil Pasic <pasic@linux.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or (at
* your option) any later version. See the COPYING file in the top-level
* directory.
*/
#include "qemu/osdep.h"
#include CONFIG_DEVICES /* CONFIG_IOMMUFD */
#include <linux/vfio.h>
#include <sys/ioctl.h>
#include "qapi/error.h"
#include "hw/vfio/vfio-common.h"
#include "sysemu/iommufd.h"
#include "hw/s390x/ap-device.h"
#include "qemu/error-report.h"
#include "qemu/event_notifier.h"
#include "qemu/main-loop.h"
#include "qemu/module.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "kvm/kvm_s390x.h"
#include "migration/vmstate.h"
#include "hw/qdev-properties.h"
#include "hw/s390x/ap-bridge.h"
#include "exec/address-spaces.h"
#include "qom/object.h"
#define TYPE_VFIO_AP_DEVICE "vfio-ap"
struct VFIOAPDevice {
APDevice apdev;
VFIODevice vdev;
EventNotifier req_notifier;
};
OBJECT_DECLARE_SIMPLE_TYPE(VFIOAPDevice, VFIO_AP_DEVICE)
static void vfio_ap_compute_needs_reset(VFIODevice *vdev)
{
vdev->needs_reset = false;
}
/*
* We don't need vfio_hot_reset_multi and vfio_eoi operations for
* vfio-ap device now.
*/
struct VFIODeviceOps vfio_ap_ops = {
.vfio_compute_needs_reset = vfio_ap_compute_needs_reset,
};
static void vfio_ap_req_notifier_handler(void *opaque)
{
VFIOAPDevice *vapdev = opaque;
Error *err = NULL;
if (!event_notifier_test_and_clear(&vapdev->req_notifier)) {
return;
}
qdev_unplug(DEVICE(vapdev), &err);
if (err) {
warn_reportf_err(err, VFIO_MSG_PREFIX, vapdev->vdev.name);
}
}
static bool vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
unsigned int irq, Error **errp)
{
int fd;
size_t argsz;
IOHandler *fd_read;
EventNotifier *notifier;
g_autofree struct vfio_irq_info *irq_info = NULL;
VFIODevice *vdev = &vapdev->vdev;
switch (irq) {
case VFIO_AP_REQ_IRQ_INDEX:
notifier = &vapdev->req_notifier;
fd_read = vfio_ap_req_notifier_handler;
break;
default:
error_setg(errp, "vfio: Unsupported device irq(%d)", irq);
return false;
}
if (vdev->num_irqs < irq + 1) {
error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)",
irq, vdev->num_irqs);
return false;
}
argsz = sizeof(*irq_info);
irq_info = g_malloc0(argsz);
irq_info->index = irq;
irq_info->argsz = argsz;
if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
irq_info) < 0 || irq_info->count < 1) {
error_setg_errno(errp, errno, "vfio: Error getting irq info");
return false;
}
if (event_notifier_init(notifier, 0)) {
error_setg_errno(errp, errno,
"vfio: Unable to init event notifier for irq (%d)",
irq);
return false;
}
fd = event_notifier_get_fd(notifier);
qemu_set_fd_handler(fd, fd_read, NULL, vapdev);
if (!vfio_set_irq_signaling(vdev, irq, 0, VFIO_IRQ_SET_ACTION_TRIGGER, fd,
errp)) {
qemu_set_fd_handler(fd, NULL, NULL, vapdev);
event_notifier_cleanup(notifier);
}
return true;
}
static void vfio_ap_unregister_irq_notifier(VFIOAPDevice *vapdev,
unsigned int irq)
{
Error *err = NULL;
EventNotifier *notifier;
switch (irq) {
case VFIO_AP_REQ_IRQ_INDEX:
notifier = &vapdev->req_notifier;
break;
default:
error_report("vfio: Unsupported device irq(%d)", irq);
return;
}
if (!vfio_set_irq_signaling(&vapdev->vdev, irq, 0,
VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
warn_reportf_err(err, VFIO_MSG_PREFIX, vapdev->vdev.name);
}
qemu_set_fd_handler(event_notifier_get_fd(notifier),
NULL, NULL, vapdev);
event_notifier_cleanup(notifier);
}
static void vfio_ap_realize(DeviceState *dev, Error **errp)
{
ERRP_GUARD();
Error *err = NULL;
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev);
VFIODevice *vbasedev = &vapdev->vdev;
if (!vfio_device_get_name(vbasedev, errp)) {
return;
}
if (!vfio_attach_device(vbasedev->name, vbasedev,
&address_space_memory, errp)) {
goto error;
}
if (!vfio_ap_register_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX, &err)) {
/*
* Report this error, but do not make it a failing condition.
* Lack of this IRQ in the host does not prevent normal operation.
*/
warn_report_err(err);
}
return;
error:
error_prepend(errp, VFIO_MSG_PREFIX, vbasedev->name);
g_free(vbasedev->name);
}
static void vfio_ap_unrealize(DeviceState *dev)
{
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev);
vfio_ap_unregister_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX);
vfio_detach_device(&vapdev->vdev);
g_free(vapdev->vdev.name);
}
static Property vfio_ap_properties[] = {
DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev),
#ifdef CONFIG_IOMMUFD
DEFINE_PROP_LINK("iommufd", VFIOAPDevice, vdev.iommufd,
TYPE_IOMMUFD_BACKEND, IOMMUFDBackend *),
#endif
DEFINE_PROP_END_OF_LIST(),
};
static void vfio_ap_reset(DeviceState *dev)
{
int ret;
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev);
ret = ioctl(vapdev->vdev.fd, VFIO_DEVICE_RESET);
if (ret) {
error_report("%s: failed to reset %s device: %s", __func__,
vapdev->vdev.name, strerror(errno));
}
}
static const VMStateDescription vfio_ap_vmstate = {
.name = "vfio-ap",
.unmigratable = 1,
};
static void vfio_ap_instance_init(Object *obj)
{
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(obj);
VFIODevice *vbasedev = &vapdev->vdev;
/*
* vfio-ap devices operate in a way compatible with discarding of
* memory in RAM blocks, as no pages are pinned in the host.
* This needs to be set before vfio_get_device() for vfio common to
* handle ram_block_discard_disable().
*/
vfio_device_init(vbasedev, VFIO_DEVICE_TYPE_AP, &vfio_ap_ops,
DEVICE(vapdev), true);
}
#ifdef CONFIG_IOMMUFD
static void vfio_ap_set_fd(Object *obj, const char *str, Error **errp)
{
vfio_device_set_fd(&VFIO_AP_DEVICE(obj)->vdev, str, errp);
}
#endif
static void vfio_ap_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
device_class_set_props(dc, vfio_ap_properties);
#ifdef CONFIG_IOMMUFD
object_class_property_add_str(klass, "fd", NULL, vfio_ap_set_fd);
#endif
dc->vmsd = &vfio_ap_vmstate;
dc->desc = "VFIO-based AP device assignment";
set_bit(DEVICE_CATEGORY_MISC, dc->categories);
dc->realize = vfio_ap_realize;
dc->unrealize = vfio_ap_unrealize;
dc->hotpluggable = true;
dc->reset = vfio_ap_reset;
dc->bus_type = TYPE_AP_BUS;
}
static const TypeInfo vfio_ap_info = {
.name = TYPE_VFIO_AP_DEVICE,
.parent = TYPE_AP_DEVICE,
.instance_size = sizeof(VFIOAPDevice),
.instance_init = vfio_ap_instance_init,
.class_init = vfio_ap_class_init,
};
static void vfio_ap_type_init(void)
{
type_register_static(&vfio_ap_info);
}
type_init(vfio_ap_type_init)