linux-kernel - [PATCH AUTOSEL 6.6 09/36] RDMA/hfi1: Use FIELD

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Date:   Tue,  7 Nov 2023 10:45:51 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Dean Luick <dean.luick@...nelisnetworks.com>,
        Leon Romanovsky <leon@...nel.org>,
        Sasha Levin <sashal@...nel.org>,
        dennis.dalessandro@...nelisnetworks.com, linux-rdma@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 09/36] RDMA/hfi1: Use FIELD_GET() to extract Link Width

From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

[ Upstream commit 8bf7187d978610b9e327a3d92728c8864a575ebd ]

Use FIELD_GET() to extract PCIe Negotiated Link Width field instead of
custom masking and shifting, and remove extract_width() which only
wraps that FIELD_GET().

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Link: https://lore.kernel.org/r/20230919125648.1920-2-ilpo.jarvinen@linux.intel.com
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Reviewed-by: Dean Luick <dean.luick@...nelisnetworks.com>
Signed-off-by: Leon Romanovsky <leon@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/hw/hfi1/pcie.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/pcie.c b/drivers/infiniband/hw/hfi1/pcie.c
index 08732e1ac9662..c132a9c073bff 100644
--- a/drivers/infiniband/hw/hfi1/pcie.c
+++ b/drivers/infiniband/hw/hfi1/pcie.c
@@ -3,6 +3,7 @@
  * Copyright(c) 2015 - 2019 Intel Corporation.
  */
 
+#include <linux/bitfield.h>
 #include <linux/pci.h>
 #include <linux/io.h>
 #include <linux/delay.h>
@@ -210,12 +211,6 @@ static u32 extract_speed(u16 linkstat)
 	return speed;
 }
 
-/* return the PCIe link speed from the given link status */
-static u32 extract_width(u16 linkstat)
-{
-	return (linkstat & PCI_EXP_LNKSTA_NLW) >> PCI_EXP_LNKSTA_NLW_SHIFT;
-}
-
 /* read the link status and set dd->{lbus_width,lbus_speed,lbus_info} */
 static void update_lbus_info(struct hfi1_devdata *dd)
 {
@@ -228,7 +223,7 @@ static void update_lbus_info(struct hfi1_devdata *dd)
 		return;
 	}
 
-	dd->lbus_width = extract_width(linkstat);
+	dd->lbus_width = FIELD_GET(PCI_EXP_LNKSTA_NLW, linkstat);
 	dd->lbus_speed = extract_speed(linkstat);
 	snprintf(dd->lbus_info, sizeof(dd->lbus_info),
 		 "PCIe,%uMHz,x%u", dd->lbus_speed, dd->lbus_width);
-- 
2.42.0