This is a note to let you know that I've just added the patch titled
dmaengine: idxd: Clear PRS disable flag when disabling IDXD device
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
dmaengine-idxd-clear-prs-disable-flag-when-disabling-idxd-device.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 863676fe1ac1b82fc9eb56c242e80acfbfc18b76 Mon Sep 17 00:00:00 2001
From: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Date: Wed, 12 Jul 2023 12:35:05 -0700
Subject: dmaengine: idxd: Clear PRS disable flag when disabling IDXD device
From: Fenghua Yu <fenghua.yu@xxxxxxxxx>
commit 863676fe1ac1b82fc9eb56c242e80acfbfc18b76 upstream.
Disabling IDXD device doesn't reset Page Request Service (PRS)
disable flag to its initial value 0. This may cause user confusion
because once PRS is disabled user will see PRS still remains the
previous setting (i.e. disabled) via sysfs interface even after the
device is disabled.
To eliminate user confusion, reset PRS disable flag to ensure that
the PRS flag bit reflects correct state after the device is disabled.
Additionally, simplify the code by setting wq->flags to 0, which clears
all flag bits, including any future additions.
Fixes: f2dc327131b5 ("dmaengine: idxd: add per wq PRS disable")
Tested-by: Tony Zhu <tony.zhu@xxxxxxxxx>
Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx>
Link: https://lore.kernel.org/r/20230712193505.3440752-1-fenghua.yu@xxxxxxxxx
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/dma/idxd/device.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index 5abbcc61c528..9a15f0d12c79 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -384,9 +384,7 @@ static void idxd_wq_disable_cleanup(struct idxd_wq *wq)
wq->threshold = 0;
wq->priority = 0;
wq->enqcmds_retries = IDXD_ENQCMDS_RETRIES;
- clear_bit(WQ_FLAG_DEDICATED, &wq->flags);
- clear_bit(WQ_FLAG_BLOCK_ON_FAULT, &wq->flags);
- clear_bit(WQ_FLAG_ATS_DISABLE, &wq->flags);
+ wq->flags = 0;
memset(wq->name, 0, WQ_NAME_SIZE);
wq->max_xfer_bytes = WQ_DEFAULT_MAX_XFER;
idxd_wq_set_max_batch_size(idxd->data->type, wq, WQ_DEFAULT_MAX_BATCH);
--
2.41.0
Patches currently in stable-queue which might be from fenghua.yu@xxxxxxxxx are
queue-6.4/dmaengine-idxd-clear-prs-disable-flag-when-disabling-idxd-device.patch
