-----Original Message----- From: liulongfang liulongfang@huawei.com Sent: Thursday, December 19, 2024 9:18 AM To: alex.williamson@redhat.com; jgg@nvidia.com; Shameerali Kolothum Thodi shameerali.kolothum.thodi@huawei.com; Jonathan Cameron jonathan.cameron@huawei.com Cc: kvm@vger.kernel.org; linux-kernel@vger.kernel.org; linuxarm@openeuler.org; liulongfang liulongfang@huawei.com Subject: [PATCH v2 2/5] 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
drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c index 8518efea3a52..4c8f1ae5b636 100644 --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c @@ -463,6 +463,19 @@ 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) { @@ -571,6 +584,9 @@ 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;
}
Reviewed-by: Shameer Kolothum shameerali.kolothum.thodi@huawei.com
Thanks, Shameer