linux-kernel - [PATCH 4/6] hisi_sas: use slot abort in v2 hw

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Message-ID: <1455625351-165881-5-git-send-email-john.garry@huawei.com>
Date:	Tue, 16 Feb 2016 20:22:29 +0800
From:	John Garry <john.garry@...wei.com>
To:	<JBottomley@...n.com>, <martin.petersen@...cle.com>
CC:	<linuxarm@...wei.com>, <zhangfei.gao@...aro.org>,
	<xuwei5@...ilicon.com>, <john.garry2@...l.dcu.ie>,
	<linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	John Garry <john.garry@...wei.com>
Subject: [PATCH 4/6] hisi_sas: use slot abort in v2 hw

When TRANS_TX_ERR_FRAME_TXED error occurs for
a command, the command should be re-attempted.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 drivers/scsi/hisi_sas/hisi_sas_v2_hw.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
index 58e1956..2bf93079b 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
@@ -1190,7 +1190,8 @@ static void sata_done_v2_hw(struct hisi_hba *hisi_hba, struct sas_task *task,
 /* by default, task resp is complete */
 static void slot_err_v2_hw(struct hisi_hba *hisi_hba,
 			   struct sas_task *task,
-			   struct hisi_sas_slot *slot)
+			   struct hisi_sas_slot *slot,
+			   int *abort_slot)
 {
 	struct task_status_struct *ts = &task->task_status;
 	struct hisi_sas_err_record_v2 *err_record = slot->status_buffer;
@@ -1299,6 +1300,13 @@ static void slot_err_v2_hw(struct hisi_hba *hisi_hba,
 			ts->stat = SAS_DATA_UNDERRUN;
 			break;
 		}
+		case TRANS_TX_ERR_FRAME_TXED:
+		{
+			/* This will request a retry */
+			ts->stat = SAS_QUEUE_FULL;
+			++(*abort_slot);
+			break;
+		}
 		case TRANS_TX_OPEN_FAIL_WITH_IT_NEXUS_LOSS:
 		case TRANS_TX_ERR_PHY_NOT_ENABLE:
 		case TRANS_TX_OPEN_CNX_ERR_BY_OTHER:
@@ -1491,11 +1499,17 @@ slot_complete_v2_hw(struct hisi_hba *hisi_hba, struct hisi_sas_slot *slot,
 
 	if ((complete_hdr->dw0 & CMPLT_HDR_ERX_MSK) &&
 		(!(complete_hdr->dw0 & CMPLT_HDR_RSPNS_XFRD_MSK))) {
+		int abort_slot = 0;
 		dev_dbg(dev, "%s slot %d has error info 0x%x\n",
 			__func__, slot->cmplt_queue_slot,
 			complete_hdr->dw0 & CMPLT_HDR_ERX_MSK);
 
-		slot_err_v2_hw(hisi_hba, task, slot);
+		slot_err_v2_hw(hisi_hba, task, slot, &abort_slot);
+		if (unlikely(abort_slot)) {
+			queue_work(hisi_hba->wq, &slot->abort_slot);
+			sts = ts->stat;
+			goto out_1;
+		}
 		goto out;
 	}
 
@@ -1555,6 +1569,7 @@ out:
 
 	if (task->task_done)
 		task->task_done(task);
+out_1:
 
 	return sts;
 }
-- 
1.9.1