DMA Engine development
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From: Vinod Koul <vkoul@kernel.org>
To: Katsuhiro Suzuki <katsuhiro@katsuster.net>
Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [v2] dmaengine: pl330: introduce debugfs interface
Date: Mon, 25 Mar 2019 10:28:30 +0530	[thread overview]
Message-ID: <20190325045830.GI5348@vkoul-mobl> (raw)

On 17-03-19, 19:03, Katsuhiro Suzuki wrote:
> This patch adds debugfs interface to show the relationship between
> DMA threads (hardware resource for transferring data) and DMA
> channel ID of DMA slave.
> 
> Typically, PL330 has many slaves than number of DMA threads.
> So sometimes PL330 cannot allocate DMA threads for all slaves even
> if a user specify DMA channel ID in devicetree. This interface will
> be useful for checking that DMA threads are allocated or not.
> 
> Below is an output sample:
> 
> $ sudo cat /sys/kernel/debug/ff1f0000.dmac
> PL330 physical channels:
> THREAD:         CHANNEL:
> --------        -----
> 0               8
> 1               9
> 2               11
> 3               12
> 4               14
> 5               15
> 6               10
> 7               --
> 

Applied, thanks

             reply	other threads:[~2019-03-25  4:58 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-25  4:58 Vinod Koul [this message]
  -- strict thread matches above, loose matches on Subject: below --
2019-03-17 10:03 [v2] dmaengine: pl330: introduce debugfs interface Katsuhiro Suzuki

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