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From: Tero Kristo <t-kristo@ti.com>
To: Peter Ujfalusi <peter.ujfalusi@ti.com>, <vkoul@kernel.org>,
	<robh+dt@kernel.org>, <nm@ti.com>, <ssantosh@kernel.org>
Cc: <dan.j.williams@intel.com>, <dmaengine@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<grygorii.strashko@ti.com>, <lokeshvutla@ti.com>,
	<tony@atomide.com>, <j-keerthy@ti.com>
Subject: Re: [PATCH v3 05/14] dmaengine: Add support for reporting DMA cached data amount
Date: Wed, 9 Oct 2019 12:17:47 +0300
Message-ID: <b20087a9-6a1f-6e5c-9311-e921a1c63f13@ti.com> (raw)
In-Reply-To: <20191001061704.2399-6-peter.ujfalusi@ti.com>

On 01/10/2019 09:16, Peter Ujfalusi wrote:
> A DMA hardware can have big cache or FIFO and the amount of data sitting in
> the DMA fabric can be an interest for the clients.
> 
> For example in audio we want to know the delay in the data flow and in case
> the DMA have significantly large FIFO/cache, it can affect the latenc/delay
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>

Reviewed-by: Tero Kristo <t-kristo@ti.com>

> ---
>   drivers/dma/dmaengine.h   | 8 ++++++++
>   include/linux/dmaengine.h | 2 ++
>   2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/dma/dmaengine.h b/drivers/dma/dmaengine.h
> index 501c0b063f85..b0b97475707a 100644
> --- a/drivers/dma/dmaengine.h
> +++ b/drivers/dma/dmaengine.h
> @@ -77,6 +77,7 @@ static inline enum dma_status dma_cookie_status(struct dma_chan *chan,
>   		state->last = complete;
>   		state->used = used;
>   		state->residue = 0;
> +		state->in_flight_bytes = 0;
>   	}
>   	return dma_async_is_complete(cookie, complete, used);
>   }
> @@ -87,6 +88,13 @@ static inline void dma_set_residue(struct dma_tx_state *state, u32 residue)
>   		state->residue = residue;
>   }
>   
> +static inline void dma_set_in_flight_bytes(struct dma_tx_state *state,
> +					   u32 in_flight_bytes)
> +{
> +	if (state)
> +		state->in_flight_bytes = in_flight_bytes;
> +}
> +
>   struct dmaengine_desc_callback {
>   	dma_async_tx_callback callback;
>   	dma_async_tx_callback_result callback_result;
> diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> index 40d062c3b359..02ceef95340a 100644
> --- a/include/linux/dmaengine.h
> +++ b/include/linux/dmaengine.h
> @@ -682,11 +682,13 @@ static inline struct dma_async_tx_descriptor *txd_next(struct dma_async_tx_descr
>    * @residue: the remaining number of bytes left to transmit
>    *	on the selected transfer for states DMA_IN_PROGRESS and
>    *	DMA_PAUSED if this is implemented in the driver, else 0
> + * @in_flight_bytes: amount of data in bytes cached by the DMA.
>    */
>   struct dma_tx_state {
>   	dma_cookie_t last;
>   	dma_cookie_t used;
>   	u32 residue;
> +	u32 in_flight_bytes;
>   };
>   
>   /**
> 

--
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  reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-01  6:16 [PATCH v3 00/14] dmaengine/soc: Add Texas Instruments UDMA support Peter Ujfalusi
2019-10-01  6:16 ` [PATCH v3 01/14] bindings: soc: ti: add documentation for k3 ringacc Peter Ujfalusi
2019-10-01  6:16 ` [PATCH v3 02/14] soc: ti: k3: add navss ringacc driver Peter Ujfalusi
2019-10-09  7:14   ` Tero Kristo
2019-10-09 13:27   ` Lokesh Vutla
2019-10-01  6:16 ` [PATCH v3 03/14] dmaengine: doc: Add sections for per descriptor metadata support Peter Ujfalusi
2019-10-09  7:30   ` Tero Kristo
2019-10-01  6:16 ` [PATCH v3 04/14] dmaengine: Add metadata_ops for dma_async_tx_descriptor Peter Ujfalusi
2019-10-09  7:37   ` Tero Kristo
2019-10-01  6:16 ` [PATCH v3 05/14] dmaengine: Add support for reporting DMA cached data amount Peter Ujfalusi
2019-10-09  9:17   ` Tero Kristo [this message]
2019-10-01  6:16 ` [PATCH v3 06/14] dmaengine: ti: Add cppi5 header for UDMA Peter Ujfalusi
2019-10-09  9:13   ` Tero Kristo
2019-10-01  6:16 ` [PATCH v3 07/14] dt-bindings: dma: ti: Add document for K3 UDMA Peter Ujfalusi
2019-10-10 17:52   ` Rob Herring
2019-10-11  7:30     ` Peter Ujfalusi
2019-10-15 17:30       ` Peter Ujfalusi
2019-10-17 14:03         ` Rob Herring
2019-10-01  6:16 ` [PATCH v3 08/14] dmaengine: ti: New driver for K3 UDMA - split#1: defines, structs, io func Peter Ujfalusi
2019-10-09 13:40   ` Tero Kristo
2019-10-01  6:16 ` [PATCH v3 09/14] dmaengine: ti: New driver for K3 UDMA - split#2: probe/remove, xlate and filter_fn Peter Ujfalusi
2019-10-03  8:35   ` Peter Ujfalusi
2019-10-01  6:17 ` [PATCH v3 10/14] dmaengine: ti: New driver for K3 UDMA - split#3: alloc/free chan_resources Peter Ujfalusi
2019-10-01  6:17 ` [PATCH v3 11/14] dmaengine: ti: New driver for K3 UDMA - split#4: dma_device callbacks 1 Peter Ujfalusi
2019-10-01  6:17 ` [PATCH v3 12/14] dmaengine: ti: New driver for K3 UDMA - split#5: dma_device callbacks 2 Peter Ujfalusi
2019-10-01  6:17 ` [PATCH v3 13/14] dmaengine: ti: New driver for K3 UDMA - split#6: Kconfig and Makefile Peter Ujfalusi
2019-10-01  6:17 ` [PATCH v3 14/14] dmaengine: ti: k3-udma: Add glue layer for non DMAengine users Peter Ujfalusi
2019-10-04 16:35 ` [PATCH v3 00/14] dmaengine/soc: Add Texas Instruments UDMA support santosh.shilimkar
2019-10-08 10:09   ` Peter Ujfalusi
2019-10-09 16:02     ` santosh.shilimkar

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