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From: Dave Jiang <dave.jiang@intel.com>
To: vkoul@kernel.org
Cc: Srinijia Kambham <srinija.kambham@intel.com>,
	Srinijia Kambham <srinija.kambham@intel.com>,
	dmaengine@vger.kernel.org
Subject: [PATCH] dmaengine: idxd: set DMA channel to be private
Date: Fri, 15 Jan 2021 14:53:07 -0700	[thread overview]
Message-ID: <161074758743.2184057.3388557138816350980.stgit@djiang5-desk3.ch.intel.com> (raw)

Add DMA_PRIVATE attribute flag to idxd DMA channels. The dedicated WQs are
expected to be used by a single client and not shared. While doing NTB
testing this mistake was discovered, which prevented ntb_transport from
requesting DSA wqs as DMA channels via dma_request_channel().

Reported-by: Srinijia Kambham <srinija.kambham@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Tested-by: Srinijia Kambham <srinija.kambham@intel.com>
Fixes: 8f47d1a5e545 ("dmaengine: idxd: connect idxd to dmaengine subsystem")
---
 drivers/dma/idxd/dma.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/dma/idxd/dma.c b/drivers/dma/idxd/dma.c
index 8ed2773d8285..90d19d06783a 100644
--- a/drivers/dma/idxd/dma.c
+++ b/drivers/dma/idxd/dma.c
@@ -165,6 +165,7 @@ int idxd_register_dma_device(struct idxd_device *idxd)
 	INIT_LIST_HEAD(&dma->channels);
 	dma->dev = &idxd->pdev->dev;
 
+	dma_cap_set(DMA_PRIVATE, dma->cap_mask);
 	dma_cap_set(DMA_COMPLETION_NO_ORDER, dma->cap_mask);
 	dma->device_release = idxd_dma_release;
 



             reply	other threads:[~2021-01-15 21:53 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-15 21:53 Dave Jiang [this message]
2021-01-17  6:52 ` [PATCH] dmaengine: idxd: set DMA channel to be private Vinod Koul

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