6.6-stable review patch. If anyone has any objections, please let me know.
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From: Longfang Liu liulongfang@huawei.com
[ Upstream commit 3495cec0787721ba7a9d5c19d0bbb66d182de584 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- 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 d09e7d295625d..521f969e1c608 100644 --- 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) { @@ -566,6 +579,9 @@ static int vf_qm_state_save(struct hisi_acc_vf_core_device *hisi_acc_vdev, }
migf->total_length = sizeof(struct acc_vf_data); + /* Save eqc and aeqc interrupt information */ + vf_qm_xeqc_save(vf_qm, migf); + return 0; }