crypto: qat - implement interface for live migration

Add logic to implement the interface for live migration defined in
qat/qat_mig_dev.h. This is specific for QAT GEN4 Virtual Functions
(VFs).

This introduces a migration data manager which is used to handle the
device state during migration. The manager ensures that the device state
is stored in a format that can be restored in the destination node.

The VF state is organized into a hierarchical structure that includes a
preamble, a general state section, a MISC bar section and an ETR bar
section. The latter contains the state of the 4 ring pairs contained on
a VF. Here is a graphical representation of the state:

    preamble | general state section | leaf state
             | MISC bar state section| leaf state
             | ETR bar state section | bank0 state section | leaf state
                                     | bank1 state section | leaf state
                                     | bank2 state section | leaf state
                                     | bank3 state section | leaf state

In addition to the implementation of the qat_migdev_ops interface and
the state manager framework, add a mutex in pfvf to avoid pf2vf messages
during migration.

Signed-off-by: Xin Zeng <xin.zeng@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/crypto/intel/qat/qat_common/adf_sriov.c b/drivers/crypto/intel/qat/qat_common/adf_sriov.c
index 87a70c00c41e..8d645e7e04aa 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_sriov.c
+++ b/drivers/crypto/intel/qat/qat_common/adf_sriov.c
@@ -26,10 +26,12 @@ static void adf_iov_send_resp(struct work_struct *work)
 	u32 vf_nr = vf_info->vf_nr;
 	bool ret;
 
+	mutex_lock(&vf_info->pfvf_mig_lock);
 	ret = adf_recv_and_handle_vf2pf_msg(accel_dev, vf_nr);
 	if (ret)
 		/* re-enable interrupt on PF from this VF */
 		adf_enable_vf2pf_interrupts(accel_dev, 1 << vf_nr);
+	mutex_unlock(&vf_info->pfvf_mig_lock);
 
 	kfree(pf2vf_resp);
 }
@@ -62,6 +64,7 @@ static int adf_enable_sriov(struct adf_accel_dev *accel_dev)
 		vf_info->vf_nr = i;
 
 		mutex_init(&vf_info->pf2vf_lock);
+		mutex_init(&vf_info->pfvf_mig_lock);
 		ratelimit_state_init(&vf_info->vf2pf_ratelimit,
 				     ADF_VF2PF_RATELIMIT_INTERVAL,
 				     ADF_VF2PF_RATELIMIT_BURST);
@@ -138,8 +141,10 @@ void adf_disable_sriov(struct adf_accel_dev *accel_dev)
 	if (hw_data->configure_iov_threads)
 		hw_data->configure_iov_threads(accel_dev, false);
 
-	for (i = 0, vf = accel_dev->pf.vf_info; i < totalvfs; i++, vf++)
+	for (i = 0, vf = accel_dev->pf.vf_info; i < totalvfs; i++, vf++) {
 		mutex_destroy(&vf->pf2vf_lock);
+		mutex_destroy(&vf->pfvf_mig_lock);
+	}
 
 	if (!test_bit(ADF_STATUS_RESTARTING, &accel_dev->status)) {
 		kfree(accel_dev->pf.vf_info);