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/*
* 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 <linux/vfio.h>
#include <sys/ioctl.h>
#include "qapi/error.h"
#include "hw/vfio/vfio.h"
#include "hw/vfio/vfio-common.h"
#include "hw/s390x/ap-device.h"
#include "qemu/error-report.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;
};
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_put_device(VFIOAPDevice *vapdev)
{
g_free(vapdev->vdev.name);
vfio_put_base_device(&vapdev->vdev);
}
static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp)
{
GError *gerror = NULL;
char *symlink, *group_path;
int groupid;
symlink = g_strdup_printf("%s/iommu_group", vapdev->vdev.sysfsdev);
group_path = g_file_read_link(symlink, &gerror);
g_free(symlink);
if (!group_path) {
error_setg(errp, "%s: no iommu_group found for %s: %s",
TYPE_VFIO_AP_DEVICE, vapdev->vdev.sysfsdev, gerror->message);
g_error_free(gerror);
return NULL;
}
if (sscanf(basename(group_path), "%d", &groupid) != 1) {
error_setg(errp, "vfio: failed to read %s", group_path);
g_free(group_path);
return NULL;
}
g_free(group_path);
return vfio_get_group(groupid, &address_space_memory, errp);
}
static void vfio_ap_realize(DeviceState *dev, Error **errp)
{
int ret;
char *mdevid;
VFIOGroup *vfio_group;
APDevice *apdev = AP_DEVICE(dev);
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
vfio_group = vfio_ap_get_group(vapdev, errp);
if (!vfio_group) {
return;
}
vapdev->vdev.ops = &vfio_ap_ops;
vapdev->vdev.type = VFIO_DEVICE_TYPE_AP;
mdevid = basename(vapdev->vdev.sysfsdev);
vapdev->vdev.name = g_strdup_printf("%s", mdevid);
vapdev->vdev.dev = dev;
/*
* 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().
*/
vapdev->vdev.ram_block_discard_allowed = true;
ret = vfio_get_device(vfio_group, mdevid, &vapdev->vdev, errp);
if (ret) {
goto out_get_dev_err;
}
return;
out_get_dev_err:
vfio_ap_put_device(vapdev);
vfio_put_group(vfio_group);
}
static void vfio_ap_unrealize(DeviceState *dev)
{
APDevice *apdev = AP_DEVICE(dev);
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
VFIOGroup *group = vapdev->vdev.group;
vfio_ap_put_device(vapdev);
vfio_put_group(group);
}
static Property vfio_ap_properties[] = {
DEFINE_PROP_STRING("sysfsdev", VFIOAPDevice, vdev.sysfsdev),
DEFINE_PROP_END_OF_LIST(),
};
static void vfio_ap_reset(DeviceState *dev)
{
int ret;
APDevice *apdev = AP_DEVICE(dev);
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
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_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
device_class_set_props(dc, vfio_ap_properties);
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),
.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)
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