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pds_vdpa: subscribe to the pds_core events

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Register for the pds_core's notification events, primarily to
find out when the FW has been reset so we can pass this on
back up the chain.

Signed-off-by: Shannon Nelson <shannon.nelson@amd.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20230519215632.12343-11-shannon.nelson@amd.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Shannon Nelson 2023-05-19 14:56:31 -07:00 committed by Michael S. Tsirkin
parent 151cc834f3
commit 67f27b8b3a
2 changed files with 59 additions and 1 deletions
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59
drivers/vdpa/pds/vdpa_dev.c
View file

@ -23,6 +23,52 @@ static struct pds_vdpa_device *vdpa_to_pdsv(struct vdpa_device *vdpa_dev)
return container_of(vdpa_dev, struct pds_vdpa_device, vdpa_dev);
}
static int pds_vdpa_notify_handler(struct notifier_block *nb,
unsigned long ecode,
void *data)
{
struct pds_vdpa_device *pdsv = container_of(nb, struct pds_vdpa_device, nb);
struct device *dev = &pdsv->vdpa_aux->padev->aux_dev.dev;
dev_dbg(dev, "%s: event code %lu\n", __func__, ecode);
if (ecode == PDS_EVENT_RESET || ecode == PDS_EVENT_LINK_CHANGE) {
if (pdsv->config_cb.callback)
pdsv->config_cb.callback(pdsv->config_cb.private);
}
return 0;
}
static int pds_vdpa_register_event_handler(struct pds_vdpa_device *pdsv)
{
struct device *dev = &pdsv->vdpa_aux->padev->aux_dev.dev;
struct notifier_block *nb = &pdsv->nb;
int err;
if (!nb->notifier_call) {
nb->notifier_call = pds_vdpa_notify_handler;
err = pdsc_register_notify(nb);
if (err) {
nb->notifier_call = NULL;
dev_err(dev, "failed to register pds event handler: %ps\n",
ERR_PTR(err));
return -EINVAL;
}
dev_dbg(dev, "pds event handler registered\n");
}
return 0;
}
static void pds_vdpa_unregister_event_handler(struct pds_vdpa_device *pdsv)
{
if (pdsv->nb.notifier_call) {
pdsc_unregister_notify(&pdsv->nb);
pdsv->nb.notifier_call = NULL;
}
}
static int pds_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
u64 desc_addr, u64 driver_addr, u64 device_addr)
{
@ -595,6 +641,12 @@ static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
pdsv->vdpa_dev.mdev = &vdpa_aux->vdpa_mdev;
err = pds_vdpa_register_event_handler(pdsv);
if (err) {
dev_err(dev, "Failed to register for PDS events: %pe\n", ERR_PTR(err));
goto err_unmap;
}
/* We use the _vdpa_register_device() call rather than the
* vdpa_register_device() to avoid a deadlock because our
* dev_add() is called with the vdpa_dev_lock already set
@ -603,13 +655,15 @@ static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
err = _vdpa_register_device(&pdsv->vdpa_dev, pdsv->num_vqs);
if (err) {
dev_err(dev, "Failed to register to vDPA bus: %pe\n", ERR_PTR(err));
goto err_unmap;
goto err_unevent;
}
pds_vdpa_debugfs_add_vdpadev(vdpa_aux);
return 0;
err_unevent:
pds_vdpa_unregister_event_handler(pdsv);
err_unmap:
put_device(&pdsv->vdpa_dev.dev);
vdpa_aux->pdsv = NULL;
@ -619,8 +673,11 @@ static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
static void pds_vdpa_dev_del(struct vdpa_mgmt_dev *mdev,
struct vdpa_device *vdpa_dev)
{
struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
struct pds_vdpa_aux *vdpa_aux;
pds_vdpa_unregister_event_handler(pdsv);
vdpa_aux = container_of(mdev, struct pds_vdpa_aux, vdpa_mdev);
_vdpa_unregister_device(vdpa_dev);

1
drivers/vdpa/pds/vdpa_dev.h
View file

@ -40,6 +40,7 @@ struct pds_vdpa_device {
u8 vdpa_index; /* rsvd for future subdevice use */
u8 num_vqs; /* num vqs in use */
struct vdpa_callback config_cb;
struct notifier_block nb;
};
#define PDS_VDPA_PACKED_INVERT_IDX 0x8000