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s390x/ap: Wire up the device request notifier interface

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Let's wire up the device request notifier interface to handle device unplug
requests for AP.

Signed-off-by: Tony Krowiak <akrowiak@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20230530225544.280031-1-akrowiak@linux.ibm.com/
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Tony Krowiak 2023-06-02 10:11:25 -04:00 committed by Cédric Le Goater
parent d0bf492f38
commit 1360b2ad1f
1 changed files with 113 additions and 0 deletions
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113
hw/vfio/ap.c
View file

@ -18,6 +18,8 @@
#include "hw/vfio/vfio-common.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"
@ -33,6 +35,7 @@
struct VFIOAPDevice {
APDevice apdev;
VFIODevice vdev;
EventNotifier req_notifier;
};
OBJECT_DECLARE_SIMPLE_TYPE(VFIOAPDevice, VFIO_AP_DEVICE)
@ -84,10 +87,110 @@ static VFIOGroup *vfio_ap_get_group(VFIOAPDevice *vapdev, Error **errp)
return vfio_get_group(groupid, &address_space_memory, errp);
}
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 void vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
unsigned int irq, Error **errp)
{
int fd;
size_t argsz;
IOHandler *fd_read;
EventNotifier *notifier;
struct vfio_irq_info *irq_info;
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;
}
if (vdev->num_irqs < irq + 1) {
error_setg(errp, "vfio: IRQ %u not available (number of irqs %u)",
irq, vdev->num_irqs);
return;
}
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");
goto out_free_info;
}
if (event_notifier_init(notifier, 0)) {
error_setg_errno(errp, errno,
"vfio: Unable to init event notifier for irq (%d)",
irq);
goto out_free_info;
}
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);
}
out_free_info:
g_free(irq_info);
}
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)
{
int ret;
char *mdevid;
Error *err = NULL;
VFIOGroup *vfio_group;
APDevice *apdev = AP_DEVICE(dev);
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
@ -116,6 +219,15 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
goto out_get_dev_err;
}
vfio_ap_register_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX, &err);
if (err) {
/*
* Report this error, but do not make it a failing condition.
* Lack of this IRQ in the host does not prevent normal operation.
*/
error_report_err(err);
}
return;
out_get_dev_err:
@ -129,6 +241,7 @@ static void vfio_ap_unrealize(DeviceState *dev)
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(apdev);
VFIOGroup *group = vapdev->vdev.group;
vfio_ap_unregister_irq_notifier(vapdev, VFIO_AP_REQ_IRQ_INDEX);
vfio_ap_put_device(vapdev);
vfio_put_group(group);
}