linux-kernel - [PATCH plinth/topic-sas-4.18] {topost} scsi: hisi_sas: send HARD RESET to clear the previous affiliation of STP target port when init device

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Message-ID: <1535011127-110586-1-git-send-email-chenxiang66@hisilicon.com>
Date:   Thu, 23 Aug 2018 15:58:47 +0800
From:   c00284940 <chenxiang66@...ilicon.com>
To:     <jejb@...ux.vnet.ibm.com>, <martin.petersen@...cle.com>
CC:     <linuxarm@...wei.com>, <linux-scsi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <john.garry@...wei.com>,
        c00284940 <chenxiang66@...ilicon.com>
Subject: [PATCH plinth/topic-sas-4.18] {topost} scsi: hisi_sas: send HARD RESET to clear the previous affiliation of STP target port when init device

If exchange SAS expander from one SAS controller to other SAS controller
without power down, the STP target port will maintain previous affiliation and
reject all subsequent connection requests from other STP initiator ports
with OPEN_REJECT (STP RESOURCES BUSY).

To solve this issue, send HARD RESET to clear the previous affiliation of
STP target port according to SPL(chapter 6.19.4).

Signed-off-by: Xiang Chen <chenxiang66@...ilicon.com>
---
 drivers/scsi/hisi_sas/hisi_sas_main.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index bb0fa24..9225138 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -612,6 +612,7 @@ static int hisi_sas_init_device(struct domain_device *device)
 	struct hisi_sas_tmf_task tmf_task;
 	int retry = HISI_SAS_SRST_ATA_DISK_CNT;
 	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
+	struct sas_phy *local_phy;
 
 	switch (device->dev_type) {
 	case SAS_END_DEVICE:
@@ -627,6 +628,14 @@ static int hisi_sas_init_device(struct domain_device *device)
 	case SAS_SATA_PM:
 	case SAS_SATA_PM_PORT:
 	case SAS_SATA_PENDING:
+		/*
+		 * send HARD RESET to clear previous affiliation of
+		 * STP target port
+		 */
+		local_phy = sas_get_local_phy(device);
+		if (!scsi_is_sas_phy_local(local_phy))
+			sas_phy_reset(local_phy, 1);
+		sas_put_local_phy(local_phy);
 		while (retry-- > 0) {
 			rc = hisi_sas_softreset_ata_disk(device);
 			if (!rc)
-- 
1.9.1