linux-kernel - [PATCH 5/9] dmaengine: idxd: Allow DMA clients to empty the pending queue

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Message-Id: <20250804-idxd-fix-flr-on-kernel-queues-v3-v1-5-4e020fbf52c1@intel.com>
Date: Mon, 04 Aug 2025 18:27:56 -0700
From: Vinicius Costa Gomes <vinicius.gomes@...el.com>
To: Dave Jiang <dave.jiang@...el.com>, Vinod Koul <vkoul@...nel.org>, 
 Fenghua Yu <fenghua.yu@...el.com>, Dan Williams <dan.j.williams@...el.com>
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Vinicius Costa Gomes <vinicius.gomes@...el.com>
Subject: [PATCH 5/9] dmaengine: idxd: Allow DMA clients to empty the
 pending queue

Send a request to drain all pending commands from the hardware queue
when the DMA clients request.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
---
 drivers/dma/idxd/dma.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/dma/idxd/dma.c b/drivers/dma/idxd/dma.c
index dbecd699237e3ac5a73b49ed2097a897abc9a043..10356a00cbdfc2ddfeea629aa749c40e7eec0a56 100644
--- a/drivers/dma/idxd/dma.c
+++ b/drivers/dma/idxd/dma.c
@@ -194,6 +194,15 @@ static void idxd_dma_release(struct dma_device *device)
 	kfree(idxd_dma);
 }
 
+static int idxd_dma_terminate_all(struct dma_chan *c)
+{
+	struct idxd_wq *wq = to_idxd_wq(c);
+
+	idxd_wq_drain(wq);
+
+	return 0;
+}
+
 int idxd_register_dma_device(struct idxd_device *idxd)
 {
 	struct idxd_dma_dev *idxd_dma;
@@ -224,6 +233,7 @@ int idxd_register_dma_device(struct idxd_device *idxd)
 	dma->device_issue_pending = idxd_dma_issue_pending;
 	dma->device_alloc_chan_resources = idxd_dma_alloc_chan_resources;
 	dma->device_free_chan_resources = idxd_dma_free_chan_resources;
+	dma->device_terminate_all = idxd_dma_terminate_all;
 
 	rc = dma_async_device_register(dma);
 	if (rc < 0) {

-- 
2.50.1