linux-kernel - [PATCH 5.15 591/913] dmaengine: idxd: restore traffic class defaults after wq reset

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Date:   Tue,  5 Apr 2022 09:27:33 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Binuraj Ravindran <binuraj.ravindran@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Vinod Koul <vkoul@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 591/913] dmaengine: idxd: restore traffic class defaults after wq reset

From: Dave Jiang <dave.jiang@...el.com>

[ Upstream commit ea7c8f598c323f6ebaf9ddae01fb2a981fe8c56a ]

When clearing the group configurations, the driver fails to restore the
default setting for DSA 1.x based devices. Add defaults in
idxd_groups_clear_state() for traffic class configuration.

Fixes: ade8a86b512c ("dmaengine: idxd: Set defaults for GRPCFG traffic class")
Reported-by: Binuraj Ravindran <binuraj.ravindran@...el.com>
Signed-off-by: Dave Jiang <dave.jiang@...el.com>
Link: https://lore.kernel.org/r/164304123369.824298.6952463420266592087.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/dma/idxd/device.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index ac671b6c0c36..7bd9ac1e93b2 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -703,8 +703,13 @@ static void idxd_groups_clear_state(struct idxd_device *idxd)
 		group->use_rdbuf_limit = false;
 		group->rdbufs_allowed = 0;
 		group->rdbufs_reserved = 0;
-		group->tc_a = -1;
-		group->tc_b = -1;
+		if (idxd->hw.version < DEVICE_VERSION_2 && !tc_override) {
+			group->tc_a = 1;
+			group->tc_b = 1;
+		} else {
+			group->tc_a = -1;
+			group->tc_b = -1;
+		}
 	}
 }
 
-- 
2.34.1