[PATCH 5.17 0723/1126] dmaengine: idxd: restore traffic class defaults after wq reset

Greg Kroah-Hartman
2022-04-05T09:52:09Z

From: Dave Jiang <dave.jiang@intel.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@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/164304123369.824298.6952463420266592087.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.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 573ad8b86804..3061fe857d69 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -681,8 +681,13 @@ 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