[PATCH v2 3/3] scsi: hisi_sas: add support for dev info update notification

[Xingui Yang]

Implement the lldd_dev_info_update callback for hisi_sas driver. When
a device's information changes (such as linkrate), clear the old ITCT
entry and setup a new one to reflect the new settings. This ensures the
hardware uses the correct information after events like cable reconnection
or renegotiation.

Signed-off-by: Xingui Yang <yangxingui@xxxxxxxxxx>
---
 drivers/scsi/hisi_sas/hisi_sas_main.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 944ce19ae2fc..095960aef6d8 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -900,6 +900,21 @@ static int hisi_sas_dev_found(struct domain_device *device)
 	return rc;
 }
 
+static void hisi_sas_dev_info_update(struct domain_device *device)
+{
+	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
+	struct hisi_sas_device *sas_dev = device->lldd_dev;
+	struct device *dev = hisi_hba->dev;
+
+	if (!sas_dev)
+		return;
+
+	dev_info(dev, "update itct for device %016llx\n",
+		 SAS_ADDR(device->sas_addr));
+	hisi_hba->hw->clear_itct(hisi_hba, sas_dev);
+	hisi_hba->hw->setup_itct(hisi_hba, sas_dev);
+}
+
 int hisi_sas_sdev_configure(struct scsi_device *sdev, struct queue_limits *lim)
 {
 	struct domain_device *dev = sdev_to_domain_dev(sdev);
@@ -2168,6 +2183,7 @@ EXPORT_SYMBOL_GPL(hisi_sas_stt);
 static struct sas_domain_function_template hisi_sas_transport_ops = {
 	.lldd_dev_found		= hisi_sas_dev_found,
 	.lldd_dev_gone		= hisi_sas_dev_gone,
+	.lldd_dev_info_update	= hisi_sas_dev_info_update,
 	.lldd_execute_task	= hisi_sas_queue_command,
 	.lldd_control_phy	= hisi_sas_control_phy,
 	.lldd_abort_task	= hisi_sas_abort_task,
-- 
2.43.0