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ibmvscsis: Enable Logical Partition Migration Support

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Changes to support a new mechanism from phyp to better synchronize the
logical partition migration (LPM) of the client partition.
This includes a new VIOCTL to register that we support this new
functionality, and 2 new Transport Event types, and finally another
new VIOCTL to let phyp know once we're ready for the Suspend.

Signed-off-by: Michael Cyr <mikecyr@us.ibm.com>
Signed-off-by: Bryant G. Ly <bryantly@linux.vnet.ibm.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Michael Cyr
2017-05-16 17:49:21 -05:00
committed by Nicholas Bellinger
parent 12bdcbd539
commit 464fd6419c
3 changed files with 162 additions and 16 deletions
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148
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
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@@ -155,6 +155,9 @@ static long ibmvscsis_unregister_command_q(struct scsi_info *vscsi)
qrc = h_free_crq(vscsi->dds.unit_id);
switch (qrc) {
case H_SUCCESS:
spin_lock_bh(&vscsi->intr_lock);
vscsi->flags &= ~PREP_FOR_SUSPEND_FLAGS;
spin_unlock_bh(&vscsi->intr_lock);
break;
case H_HARDWARE:
@@ -422,6 +425,9 @@ static void ibmvscsis_disconnect(struct work_struct *work)
new_state = vscsi->new_state;
vscsi->new_state = 0;
vscsi->flags |= DISCONNECT_SCHEDULED;
vscsi->flags &= ~SCHEDULE_DISCONNECT;
pr_debug("disconnect: flags 0x%x, state 0x%hx\n", vscsi->flags,
vscsi->state);
@@ -802,6 +808,13 @@ static long ibmvscsis_establish_new_q(struct scsi_info *vscsi)
long rc = ADAPT_SUCCESS;
uint format;
rc = h_vioctl(vscsi->dds.unit_id, H_ENABLE_PREPARE_FOR_SUSPEND, 30000,
0, 0, 0, 0);
if (rc == H_SUCCESS)
vscsi->flags |= PREP_FOR_SUSPEND_ENABLED;
else if (rc != H_NOT_FOUND)
pr_err("Error from Enable Prepare for Suspend: %ld\n", rc);
vscsi->flags &= PRESERVE_FLAG_FIELDS;
vscsi->rsp_q_timer.timer_pops = 0;
vscsi->debit = 0;
@@ -950,6 +963,63 @@ static void ibmvscsis_free_cmd_resources(struct scsi_info *vscsi,
}
}
/**
* ibmvscsis_ready_for_suspend() - Helper function to call VIOCTL
* @vscsi: Pointer to our adapter structure
* @idle: Indicates whether we were called from adapter_idle. This
* is important to know if we need to do a disconnect, since if
* we're called from adapter_idle, we're still processing the
* current disconnect, so we can't just call post_disconnect.
*
* This function is called when the adapter is idle when phyp has sent
* us a Prepare for Suspend Transport Event.
*
* EXECUTION ENVIRONMENT:
* Process or interrupt environment called with interrupt lock held
*/
static long ibmvscsis_ready_for_suspend(struct scsi_info *vscsi, bool idle)
{
long rc = 0;
struct viosrp_crq *crq;
/* See if there is a Resume event in the queue */
crq = vscsi->cmd_q.base_addr + vscsi->cmd_q.index;
pr_debug("ready_suspend: flags 0x%x, state 0x%hx crq_valid:%x\n",
vscsi->flags, vscsi->state, (int)crq->valid);
if (!(vscsi->flags & PREP_FOR_SUSPEND_ABORTED) && !(crq->valid)) {
rc = h_vioctl(vscsi->dds.unit_id, H_READY_FOR_SUSPEND, 0, 0, 0,
0, 0);
if (rc) {
pr_err("Ready for Suspend Vioctl failed: %ld\n", rc);
rc = 0;
}
} else if (((vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE) &&
(vscsi->flags & PREP_FOR_SUSPEND_ABORTED)) ||
((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
(crq->format != RESUME_FROM_SUSP)))) {
if (idle) {
vscsi->state = ERR_DISCONNECT_RECONNECT;
ibmvscsis_reset_queue(vscsi);
rc = -1;
} else if (vscsi->state == CONNECTED) {
ibmvscsis_post_disconnect(vscsi,
ERR_DISCONNECT_RECONNECT, 0);
}
vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
if ((crq->valid) && ((crq->valid != VALID_TRANS_EVENT) ||
(crq->format != RESUME_FROM_SUSP)))
pr_err("Invalid element in CRQ after Prepare for Suspend");
}
vscsi->flags &= ~(PREP_FOR_SUSPEND_PENDING | PREP_FOR_SUSPEND_ABORTED);
return rc;
}
/**
* ibmvscsis_trans_event() - Handle a Transport Event
* @vscsi: Pointer to our adapter structure
@@ -974,18 +1044,8 @@ static long ibmvscsis_trans_event(struct scsi_info *vscsi,
case PARTNER_FAILED:
case PARTNER_DEREGISTER:
ibmvscsis_delete_client_info(vscsi, true);
break;
default:
rc = ERROR;
dev_err(&vscsi->dev, "trans_event: invalid format %d\n",
(uint)crq->format);
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT,
RESPONSE_Q_DOWN);
break;
}
if (rc == ADAPT_SUCCESS) {
if (crq->format == MIGRATED)
vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
switch (vscsi->state) {
case NO_QUEUE:
case ERR_DISCONNECTED:
@@ -1034,6 +1094,60 @@ static long ibmvscsis_trans_event(struct scsi_info *vscsi,
vscsi->flags |= (RESPONSE_Q_DOWN | TRANS_EVENT);
break;
}
break;
case PREPARE_FOR_SUSPEND:
pr_debug("Prep for Suspend, crq status = 0x%x\n",
(int)crq->status);
switch (vscsi->state) {
case ERR_DISCONNECTED:
case WAIT_CONNECTION:
case CONNECTED:
ibmvscsis_ready_for_suspend(vscsi, false);
break;
case SRP_PROCESSING:
vscsi->resume_state = vscsi->state;
vscsi->flags |= PREP_FOR_SUSPEND_PENDING;
if (crq->status == CRQ_ENTRY_OVERWRITTEN)
vscsi->flags |= PREP_FOR_SUSPEND_OVERWRITE;
ibmvscsis_post_disconnect(vscsi, WAIT_IDLE, 0);
break;
case NO_QUEUE:
case UNDEFINED:
case UNCONFIGURING:
case WAIT_ENABLED:
case ERR_DISCONNECT:
case ERR_DISCONNECT_RECONNECT:
case WAIT_IDLE:
pr_err("Invalid state for Prepare for Suspend Trans Event: 0x%x\n",
vscsi->state);
break;
}
break;
case RESUME_FROM_SUSP:
pr_debug("Resume from Suspend, crq status = 0x%x\n",
(int)crq->status);
if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
vscsi->flags |= PREP_FOR_SUSPEND_ABORTED;
} else {
if ((crq->status == CRQ_ENTRY_OVERWRITTEN) ||
(vscsi->flags & PREP_FOR_SUSPEND_OVERWRITE)) {
ibmvscsis_post_disconnect(vscsi,
ERR_DISCONNECT_RECONNECT,
0);
vscsi->flags &= ~PREP_FOR_SUSPEND_OVERWRITE;
}
}
break;
default:
rc = ERROR;
dev_err(&vscsi->dev, "trans_event: invalid format %d\n",
(uint)crq->format);
ibmvscsis_post_disconnect(vscsi, ERR_DISCONNECT,
RESPONSE_Q_DOWN);
break;
}
rc = vscsi->flags & SCHEDULE_DISCONNECT;
@@ -1201,6 +1315,7 @@ static struct ibmvscsis_cmd *ibmvscsis_get_free_cmd(struct scsi_info *vscsi)
static void ibmvscsis_adapter_idle(struct scsi_info *vscsi)
{
int free_qs = false;
long rc = 0;
pr_debug("adapter_idle: flags 0x%x, state 0x%hx\n", vscsi->flags,
vscsi->state);
@@ -1240,7 +1355,14 @@ static void ibmvscsis_adapter_idle(struct scsi_info *vscsi)
vscsi->rsp_q_timer.timer_pops = 0;
vscsi->debit = 0;
vscsi->credit = 0;
if (vscsi->flags & TRANS_EVENT) {
if (vscsi->flags & PREP_FOR_SUSPEND_PENDING) {
vscsi->state = vscsi->resume_state;
vscsi->resume_state = 0;
rc = ibmvscsis_ready_for_suspend(vscsi, true);
vscsi->flags &= ~DISCONNECT_SCHEDULED;
if (rc)
break;
} else if (vscsi->flags & TRANS_EVENT) {
vscsi->state = WAIT_CONNECTION;
vscsi->flags &= PRESERVE_FLAG_FIELDS;
} else {