linux-kernel - Re: [PATCH v3 0/4] Add APIs to request TX/RX DMA channels for thread ID

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Date: Fri, 22 Dec 2023 22:16:11 +0200
From: Péter Ujfalusi <peter.ujfalusi@...il.com>
To: Siddharth Vadapalli <s-vadapalli@...com>, vkoul@...nel.org
Cc: dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, srk@...com, vigneshr@...com
Subject: Re: [PATCH v3 0/4] Add APIs to request TX/RX DMA channels for thread
 ID

Hi Siddharth,

On 12/18/23 08:26, Siddharth Vadapalli wrote:
> The existing APIs for requesting TX and RX DMA channels rely on parsing
> a device-tree node to obtain the Channel/Thread IDs from their names.
> However, it is possible to know the thread IDs by alternative means such
> as being informed by Firmware on a remote core via RPMsg regarding the
> allocated TX/RX DMA channel thread IDs. In such cases, the driver can be
> probed by non device-tree methods such as RPMsg-bus, due to which it is not
> necessary that the device using the DMA has a device-tree node
> corresponding to it. Thus, add APIs to enable the driver to make use of
> the existing DMA APIs even when there's no device-tree node.
> 
> Additionally, since the name of the device for the remote RX channel is
> being set purely on the basis of the RX channel ID itself, it can result
> in duplicate names when multiple flows are used on the same channel.
> Avoid name duplication by including the flow in the name.

Thank you for the updates,
Acked-by: Peter Ujfalusi <peter.ujfalusi@...il.com>

> Series is based on linux-next tagged next-20231215.
> 
> v2:
> https://lore.kernel.org/r/20231212111011.1401641-1-s-vadapalli@ti.com/
> Changes since v2:
> - Rebased series on linux-next tagged next-20231215.
> - Renamed the function "k3_udma_glue_request_tx_chn_by_id()" to
>   "k3_udma_glue_request_tx_chn_for_thread_id()" as suggested by:
>   Péter Ujfalusi <peter.ujfalusi@...il.com>
> - Similar to the above change, I have also renamed the function
>   "k3_udma_glue_request_remote_rx_chn_by_id()" to
>   "k3_udma_glue_request_remote_rx_chn_for_thread_id()".
> - Updated the function prototypes in include/linux/dma/k3-udma-glue.h
>   accordingly.
> - Updated the commit messages for patches 3/4 and 4/4 to match the
>   changes made to the function names.
> 
> v1:
> https://lore.kernel.org/r/20231114083906.3143548-1-s-vadapalli@ti.com/
> Changes since v1:
> - Rebased series on linux-next tagged next-20231212.
> - Updated commit messages with details regarding the use-case for which
>   the newly added APIs will be required.
> - Removed unnecessary return value check within
>   "of_k3_udma_glue_parse_chn()" function in patch 1, since it will fall
>   through to "out_put_spec" anyway.
> - Removed unnecessary return value check within
>   "of_k3_udma_glue_parse_chn_by_id()" function in patch 1, since it will
>   fall through to "out_put_spec" anyway.
> - Moved patch 4 of v1 series to patch 2 of current series.
> 
> RFC Series:
> https://lore.kernel.org/r/20231111121555.2656760-1-s-vadapalli@ti.com/
> Changes since RFC Series:
> - Rebased patches 1, 2 and 3 on linux-next tagged next-20231114.
> - Added patch 4 to the series.
> 
> Regards,
> Siddharth.
> 
> Siddharth Vadapalli (4):
>   dmaengine: ti: k3-udma-glue: Add function to parse channel by ID
>   dmaengine: ti: k3-udma-glue: Update name for remote RX channel device
>   dmaengine: ti: k3-udma-glue: Add function to request TX chan for
>     thread ID
>   dmaengine: ti: k3-udma-glue: Add function to request RX chan for
>     thread ID
> 
>  drivers/dma/ti/k3-udma-glue.c    | 306 ++++++++++++++++++++++---------
>  include/linux/dma/k3-udma-glue.h |  10 +
>  2 files changed, 229 insertions(+), 87 deletions(-)
> 

-- 
Péter