hisi_acc_vfio_pci: add eq and aeq interruption restore

In order to ensure that the task packets of the accelerator
device are not lost during the migration process, it is necessary
to send an EQ and AEQ command to the device after the live migration
is completed and to update the completion position of the task queue.

Let the device recheck the completed tasks data and if there are
uncollected packets, device resend a task completion interrupt
to the software.

Fixes: b0eed085903e ("hisi_acc_vfio_pci: Add support for VFIO live migration")
Signed-off-by: Longfang Liu <liulongfang@huawei.com>
Reviewed-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Link: https://lore.kernel.org/r/20250510081155.55840-3-liulongfang@huawei.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
index 304dbdfa0e95a7624f9cb58b41bd013d9c6d19a1..80217aea54755bb2d85022134bf8f5283e52e33a 100644 (file)
--- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
+++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
@@ -470,6 +470,19 @@ static int vf_qm_get_match_data(struct hisi_acc_vf_core_device *hisi_acc_vdev,
        return 0;
 }
 
+static void vf_qm_xeqc_save(struct hisi_qm *qm,
+                           struct hisi_acc_vf_migration_file *migf)
+{
+       struct acc_vf_data *vf_data = &migf->vf_data;
+       u16 eq_head, aeq_head;
+
+       eq_head = vf_data->qm_eqc_dw[0] & 0xFFFF;
+       qm_db(qm, 0, QM_DOORBELL_CMD_EQ, eq_head, 0);
+
+       aeq_head = vf_data->qm_aeqc_dw[0] & 0xFFFF;
+       qm_db(qm, 0, QM_DOORBELL_CMD_AEQ, aeq_head, 0);
+}
+
 static int vf_qm_load_data(struct hisi_acc_vf_core_device *hisi_acc_vdev,
                           struct hisi_acc_vf_migration_file *migf)
 {
@@ -578,6 +591,9 @@ static int vf_qm_state_save(struct hisi_acc_vf_core_device *hisi_acc_vdev,
                return -EINVAL;
 
        migf->total_length = sizeof(struct acc_vf_data);
+       /* Save eqc and aeqc interrupt information */
+       vf_qm_xeqc_save(vf_qm, migf);
+
        return 0;
 }