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

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Message-ID: <1554734722-7833-3-git-send-email-wesley.sheng@microchip.com>
Date:   Mon, 8 Apr 2019 22:45:21 +0800
From:   Wesley Sheng <wesley.sheng@...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:     <wesleyshenggit@...a.com>, <wesley.sheng@...rochip.com>,
        <kelvin.cao@...rochip.com>
Subject: [PATCH 2/3] ntb_hw_switchtec: Skip unnecessary re-setup of shared memory window for crosslink case

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