linux-kernel - [PATCH v3] dmaengine: idxd: Clear PRS disable flag when disabling IDXD device

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Message-Id: <20230712193505.3440752-1-fenghua.yu@intel.com>
Date:   Wed, 12 Jul 2023 12:35:05 -0700
From:   Fenghua Yu <fenghua.yu@...el.com>
To:     "Vinod Koul" <vkoul@...nel.org>,
        "Dave Jiang" <dave.jiang@...el.com>
Cc:     dmaengine@...r.kernel.org,
        "linux-kernel" <linux-kernel@...r.kernel.org>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Tony Zhu <tony.zhu@...el.com>
Subject: [PATCH v3] dmaengine: idxd: Clear PRS disable flag when disabling IDXD device

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@...el.com>
Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
v3:
- Add "Fixes" tag.
- Set wq->flags to 0.

v2:
- Fix Tony's email typo

 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);
-- 
2.37.1