From: Quinn Tran <qtran@marvell.com>
Date: Thu, 24 Jan 2019 23:23:40 -0800
Subject: [PATCH] scsi: qla2xxx: Add pci function reset support.
Git-commit: 590f806ddd2e4d44dca9d73cbe08d2088a453a71
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git
Patch-mainline: Queued in subsystem maintainer repository
References: bsc#1124541

This patch provide call back functions to stop the chip and resume the chip
if the PCI lower level driver wants to perform function level reset/FLR.
Before the FLR, the chip will be stopped to turn off all DMA activity.
After the FLR, the chip is reset to resume previous operation state.

Signed-off-by: Quinn Tran <qtran@marvell.com>
Signed-off-by: Himanshu Madhani <hmadhani@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 drivers/scsi/qla2xxx/qla_os.c | 53 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 715b5526fb0a..ea58398bfdb1 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -7115,6 +7115,57 @@ qla2xxx_pci_resume(struct pci_dev *pdev)
 	ha->flags.eeh_busy = 0;
 }
 
+static void
+qla_pci_reset_prepare(struct pci_dev *pdev)
+{
+	scsi_qla_host_t *base_vha = pci_get_drvdata(pdev);
+	struct qla_hw_data *ha = base_vha->hw;
+	struct qla_qpair *qpair;
+
+	ql_log(ql_log_warn, base_vha, 0xffff,
+	    "%s.\n", __func__);
+
+	/*
+	 * PCI FLR/function reset is about to reset the
+	 * slot. Stop the chip to stop all DMA access.
+	 * It is assumed that pci_reset_done will be called
+	 * after FLR to resume Chip operation.
+	 */
+	ha->flags.eeh_busy = 1;
+	mutex_lock(&ha->mq_lock);
+	list_for_each_entry(qpair, &base_vha->qp_list, qp_list_elem)
+		qpair->online = 0;
+	mutex_unlock(&ha->mq_lock);
+
+	set_bit(ABORT_ISP_ACTIVE, &base_vha->dpc_flags);
+	qla2x00_abort_isp_cleanup(base_vha);
+	qla2x00_abort_all_cmds(base_vha, DID_RESET << 16);
+}
+
+static void
+qla_pci_reset_done(struct pci_dev *pdev)
+{
+	scsi_qla_host_t *base_vha = pci_get_drvdata(pdev);
+	struct qla_hw_data *ha = base_vha->hw;
+	struct qla_qpair *qpair;
+
+	ql_log(ql_log_warn, base_vha, 0xffff,
+	    "%s.\n", __func__);
+
+	/*
+	 * FLR just completed by PCI layer. Resume adapter
+	 */
+	ha->flags.eeh_busy = 0;
+	mutex_lock(&ha->mq_lock);
+	list_for_each_entry(qpair, &base_vha->qp_list, qp_list_elem)
+		qpair->online = 1;
+	mutex_unlock(&ha->mq_lock);
+
+	base_vha->flags.online = 1;
+	ha->isp_ops->abort_isp(base_vha);
+	clear_bit(ABORT_ISP_ACTIVE, &base_vha->dpc_flags);
+}
+
 static int qla2xxx_map_queues(struct Scsi_Host *shost)
 {
 	int rc;
@@ -7133,6 +7184,8 @@ static const struct pci_error_handlers qla2xxx_err_handler = {
 	.mmio_enabled = qla2xxx_pci_mmio_enabled,
 	.slot_reset = qla2xxx_pci_slot_reset,
 	.resume = qla2xxx_pci_resume,
+	.reset_prepare = qla_pci_reset_prepare,
+	.reset_done = qla_pci_reset_done,
 };
 
 static struct pci_device_id qla2xxx_pci_tbl[] = {
-- 
2.16.4