scsi: mpi3mr: Support Prepare for Reset event

The IOC sends a Prepare for Reset Event to the host to prepare for a Soft
Reset. This event data has two reason codes:

 1. Start - The host is expected to gracefully quiesce all I/O within
    approximately 1 second.

 2. Abort - The IOC is requesting to abort a previous Prepare for Reset
    Event request. Normal I/O may be resumed.

Link: https://lore.kernel.org/r/20211220141159.16117-20-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

3 files changed, 96 insertions, 33 deletions

diff --git a/drivers/scsi/mpi3mr/mpi3mr.h b/drivers/scsi/mpi3mr/mpi3mr.h
index 26029570c3eb..8dd669fa5efb 100644
--- a/drivers/scsi/mpi3mr/mpi3mr.h
+++ b/drivers/scsi/mpi3mr/mpi3mr.h
@@ -114,6 +114,7 @@ extern int prot_mask;
 #define MPI3MR_TSUPDATE_INTERVAL		900
 #define MPI3MR_DEFAULT_SHUTDOWN_TIME		120
 #define	MPI3MR_RAID_ERRREC_RESET_TIMEOUT	180
+#define MPI3MR_PREPARE_FOR_RESET_TIMEOUT	180
 #define MPI3MR_RESET_ACK_TIMEOUT		30
 
 #define MPI3MR_WATCHDOG_INTERVAL		1000 /* in milli seconds */
@@ -693,6 +694,8 @@ struct scmd_priv {
  * @prev_reset_result: Result of previous reset
  * @reset_mutex: Controller reset mutex
  * @reset_waitq: Controller reset  wait queue
+ * @prepare_for_reset: Prepare for reset event received
+ * @prepare_for_reset_timeout_counter: Prepare for reset timeout
  * @diagsave_timeout: Diagnostic information save timeout
  * @logging_level: Controller debug logging level
  * @flush_io_count: I/O count to flush after reset
@@ -825,6 +828,9 @@ struct mpi3mr_ioc {
 	struct mutex reset_mutex;
 	wait_queue_head_t reset_waitq;
 
+	u8 prepare_for_reset;
+	u16 prepare_for_reset_timeout_counter;
+
 	u16 diagsave_timeout;
 	int logging_level;
 	u16 flush_io_count;
diff --git a/drivers/scsi/mpi3mr/mpi3mr_fw.c b/drivers/scsi/mpi3mr/mpi3mr_fw.c
index b25f8e5ee8a0..a9491f790cd8 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_fw.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_fw.c
@@ -2262,7 +2262,8 @@ static void mpi3mr_watchdog_work(struct work_struct *work)
 	    container_of(work, struct mpi3mr_ioc, watchdog_work.work);
 	unsigned long flags;
 	enum mpi3mr_iocstate ioc_state;
-	u32 fault, host_diagnostic;
+	u32 fault, host_diagnostic, ioc_status;
+	u32 reset_reason = MPI3MR_RESET_FROM_FAULT_WATCH;
 
 	if (mrioc->reset_in_progress || mrioc->unrecoverable)
 		return;
@@ -2272,43 +2273,55 @@ static void mpi3mr_watchdog_work(struct work_struct *work)
 		mpi3mr_sync_timestamp(mrioc);
 	}
 
+	if ((mrioc->prepare_for_reset) &&
+	    ((mrioc->prepare_for_reset_timeout_counter++) >=
+	     MPI3MR_PREPARE_FOR_RESET_TIMEOUT)) {
+		mpi3mr_soft_reset_handler(mrioc,
+		    MPI3MR_RESET_FROM_CIACTVRST_TIMER, 1);
+		return;
+	}
+
+	ioc_status = readl(&mrioc->sysif_regs->ioc_status);
+	if (ioc_status & MPI3_SYSIF_IOC_STATUS_RESET_HISTORY) {
+		mpi3mr_soft_reset_handler(mrioc, MPI3MR_RESET_FROM_FIRMWARE, 0);
+		return;
+	}
+
 	/*Check for fault state every one second and issue Soft reset*/
 	ioc_state = mpi3mr_get_iocstate(mrioc);
-	if (ioc_state == MRIOC_STATE_FAULT) {
-		fault = readl(&mrioc->sysif_regs->fault) &
-		    MPI3_SYSIF_FAULT_CODE_MASK;
-		host_diagnostic = readl(&mrioc->sysif_regs->host_diagnostic);
-		if (host_diagnostic & MPI3_SYSIF_HOST_DIAG_SAVE_IN_PROGRESS) {
-			if (!mrioc->diagsave_timeout) {
-				mpi3mr_print_fault_info(mrioc);
-				ioc_warn(mrioc, "Diag save in progress\n");
-			}
-			if ((mrioc->diagsave_timeout++) <=
-			    MPI3_SYSIF_DIAG_SAVE_TIMEOUT)
-				goto schedule_work;
-		} else
-			mpi3mr_print_fault_info(mrioc);
-		mrioc->diagsave_timeout = 0;
+	if (ioc_state != MRIOC_STATE_FAULT)
+		goto schedule_work;
 
-		if (fault == MPI3_SYSIF_FAULT_CODE_POWER_CYCLE_REQUIRED) {
-			ioc_info(mrioc,
-			    "Factory Reset fault occurred marking controller as unrecoverable"
-			    );
-			mrioc->unrecoverable = 1;
-			goto out;
+	fault = readl(&mrioc->sysif_regs->fault) & MPI3_SYSIF_FAULT_CODE_MASK;
+	host_diagnostic = readl(&mrioc->sysif_regs->host_diagnostic);
+	if (host_diagnostic & MPI3_SYSIF_HOST_DIAG_SAVE_IN_PROGRESS) {
+		if (!mrioc->diagsave_timeout) {
+			mpi3mr_print_fault_info(mrioc);
+			ioc_warn(mrioc, "diag save in progress\n");
 		}
+		if ((mrioc->diagsave_timeout++) <= MPI3_SYSIF_DIAG_SAVE_TIMEOUT)
+			goto schedule_work;
+	}
 
-		if ((fault == MPI3_SYSIF_FAULT_CODE_DIAG_FAULT_RESET) ||
-		    (fault == MPI3_SYSIF_FAULT_CODE_SOFT_RESET_IN_PROGRESS) ||
-		    (mrioc->reset_in_progress))
-			goto out;
-		if (fault == MPI3_SYSIF_FAULT_CODE_CI_ACTIVATION_RESET)
-			mpi3mr_soft_reset_handler(mrioc,
-			    MPI3MR_RESET_FROM_CIACTIV_FAULT, 0);
-		else
-			mpi3mr_soft_reset_handler(mrioc,
-			    MPI3MR_RESET_FROM_FAULT_WATCH, 0);
+	mpi3mr_print_fault_info(mrioc);
+	mrioc->diagsave_timeout = 0;
+
+	switch (fault) {
+	case MPI3_SYSIF_FAULT_CODE_POWER_CYCLE_REQUIRED:
+		ioc_info(mrioc,
+		    "controller requires system power cycle, marking controller as unrecoverable\n");
+		mrioc->unrecoverable = 1;
+		return;
+	case MPI3_SYSIF_FAULT_CODE_SOFT_RESET_IN_PROGRESS:
+		return;
+	case MPI3_SYSIF_FAULT_CODE_CI_ACTIVATION_RESET:
+		reset_reason = MPI3MR_RESET_FROM_CIACTIV_FAULT;
+		break;
+	default:
+		break;
 	}
+	mpi3mr_soft_reset_handler(mrioc, reset_reason, 0);
+	return;
 
 schedule_work:
 	spin_lock_irqsave(&mrioc->watchdog_lock, flags);
@@ -2317,7 +2330,6 @@ schedule_work:
 		    &mrioc->watchdog_work,
 		    msecs_to_jiffies(MPI3MR_WATCHDOG_INTERVAL));
 	spin_unlock_irqrestore(&mrioc->watchdog_lock, flags);
-out:
 	return;
 }
 
@@ -3488,6 +3500,7 @@ static int mpi3mr_enable_events(struct mpi3mr_ioc *mrioc)
 	mpi3mr_unmask_events(mrioc, MPI3_EVENT_SAS_BROADCAST_PRIMITIVE);
 	mpi3mr_unmask_events(mrioc, MPI3_EVENT_PCIE_TOPOLOGY_CHANGE_LIST);
 	mpi3mr_unmask_events(mrioc, MPI3_EVENT_PCIE_ENUMERATION);
+	mpi3mr_unmask_events(mrioc, MPI3_EVENT_PREPARE_FOR_RESET);
 	mpi3mr_unmask_events(mrioc, MPI3_EVENT_CABLE_MGMT);
 	mpi3mr_unmask_events(mrioc, MPI3_EVENT_ENERGY_PACK_CHANGE);
 
@@ -4223,6 +4236,10 @@ int mpi3mr_soft_reset_handler(struct mpi3mr_ioc *mrioc,
 	mpi3mr_cleanup_fwevt_list(mrioc);
 	mpi3mr_flush_host_io(mrioc);
 	mpi3mr_invalidate_devhandles(mrioc);
+	if (mrioc->prepare_for_reset) {
+		mrioc->prepare_for_reset = 0;
+		mrioc->prepare_for_reset_timeout_counter = 0;
+	}
 	mpi3mr_memset_buffers(mrioc);
 	retval = mpi3mr_reinit_ioc(mrioc, 0);
 	if (retval) {
diff --git a/drivers/scsi/mpi3mr/mpi3mr_os.c b/drivers/scsi/mpi3mr/mpi3mr_os.c
index 728d6ce51079..192986f38533 100644
--- a/drivers/scsi/mpi3mr/mpi3mr_os.c
+++ b/drivers/scsi/mpi3mr/mpi3mr_os.c
@@ -1989,6 +1989,40 @@ out:
 }
 
 /**
+ * mpi3mr_preparereset_evt_th - Prepare for reset event tophalf
+ * @mrioc: Adapter instance reference
+ * @event_reply: event data
+ *
+ * Blocks and unblocks host level I/O based on the reason code
+ *
+ * Return: Nothing
+ */
+static void mpi3mr_preparereset_evt_th(struct mpi3mr_ioc *mrioc,
+	struct mpi3_event_notification_reply *event_reply)
+{
+	struct mpi3_event_data_prepare_for_reset *evtdata =
+	    (struct mpi3_event_data_prepare_for_reset *)event_reply->event_data;
+
+	if (evtdata->reason_code == MPI3_EVENT_PREPARE_RESET_RC_START) {
+		dprint_event_th(mrioc,
+		    "prepare for reset event top half with rc=start\n");
+		if (mrioc->prepare_for_reset)
+			return;
+		mrioc->prepare_for_reset = 1;
+		mrioc->prepare_for_reset_timeout_counter = 0;
+	} else if (evtdata->reason_code == MPI3_EVENT_PREPARE_RESET_RC_ABORT) {
+		dprint_event_th(mrioc,
+		    "prepare for reset top half with rc=abort\n");
+		mrioc->prepare_for_reset = 0;
+		mrioc->prepare_for_reset_timeout_counter = 0;
+	}
+	if ((event_reply->msg_flags & MPI3_EVENT_NOTIFY_MSGFLAGS_ACK_MASK)
+	    == MPI3_EVENT_NOTIFY_MSGFLAGS_ACK_REQUIRED)
+		mpi3mr_send_event_ack(mrioc, event_reply->event, NULL,
+		    le32_to_cpu(event_reply->event_context));
+}
+
+/**
  * mpi3mr_energypackchg_evt_th - Energy pack change evt tophalf
  * @mrioc: Adapter instance reference
  * @event_reply: event data
@@ -2075,6 +2109,12 @@ void mpi3mr_os_handle_events(struct mpi3mr_ioc *mrioc,
 		mpi3mr_pcietopochg_evt_th(mrioc, event_reply);
 		break;
 	}
+	case MPI3_EVENT_PREPARE_FOR_RESET:
+	{
+		mpi3mr_preparereset_evt_th(mrioc, event_reply);
+		ack_req = 0;
+		break;
+	}
 	case MPI3_EVENT_DEVICE_INFO_CHANGED:
 	{
 		process_evt_bh = 1;