linux-kernel - [PATCH 2/3] ntb_hw_switchtec: Skip unnecessary re-setup of shared memory window for crosslink case

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Date:   Thu, 6 Jun 2019 15:09:43 +0800
From:   Kelvin Cao <kelvin.cao@...rochip.com>
To:     <kurt.schwemmer@...rosemi.com>, <logang@...tatee.com>,
        <jdmason@...zu.us>, <dave.jiang@...el.com>, <allenbh@...il.com>,
        <linux-pci@...r.kernel.org>, <linux-ntb@...glegroups.com>,
        <linux-kernel@...r.kernel.org>
CC:     <kelvin.cao@...rochip.com>, <kelvincao@...look.com>
Subject: [PATCH 2/3] ntb_hw_switchtec: Skip unnecessary re-setup of shared memory window for crosslink case

From: Wesley Sheng <wesley.sheng@...rochip.com>

In case of NTB crosslink topology, the setting of shared memory window in
the virtual partition doesn't reset on peer's reboot. So skip the
unnecessary re-setup of shared memory window for that case.

Signed-off-by: Wesley Sheng <wesley.sheng@...rochip.com>
---
 drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
index 947ed0b..6cf15c18 100644
--- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
+++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c
@@ -1459,6 +1459,9 @@ static int switchtec_ntb_reinit_peer(struct switchtec_ntb *sndev)
 {
 	int rc;
 
+	if (crosslink_is_enabled(sndev))
+		return 0;
+
 	dev_info(&sndev->stdev->dev, "reinitialize shared memory window\n");
 	rc = config_rsvd_lut_win(sndev, sndev->mmio_peer_ctrl, 0,
 				 sndev->self_partition,
-- 
2.7.4