linux-kernel - RE: [PATCH 2/2] habanalabs: handle barriers in DMA QMAN streams

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Message-ID: <DB8PR02MB5468F96C4CDD58D2A3676E3ED2C80@DB8PR02MB5468.eurprd02.prod.outlook.com>
Date:   Tue, 31 Mar 2020 18:29:57 +0000
From:   Tomer Tayar <ttayar@...ana.ai>
To:     Oded Gabbay <oded.gabbay@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Omer Shpigelman <oshpigelman@...ana.ai>
CC:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: RE: [PATCH 2/2] habanalabs: handle barriers in DMA QMAN streams

On Sat, Mar 31, 2020 at 17:56, Oded Gabbay <oded.gabbay@...il.com> wrote:
> When we have DMA QMAN with multiple streams, we need to know
> whether the
> command buffer contains at least one DMA packet in order to configure the
> barriers correctly when adding the 2xMSG_PROT at the end of the JOB. If
> there is no DMA packet, then there is no need to put engine barrier. This
> is relevant only for GAUDI as GOYA doesn't have streams so the engine can't
> be busy by another stream.
> 
> Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>

Reviewed-by: Tomer Tayar <ttayar@...ana.ai>