dmaengine Archive on lore.kernel.org
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From: Peter Ujfalusi <peter.ujfalusi@ti.com>
To: <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>,
	<t-kristo@ti.com>, <tony@atomide.com>, <j-keerthy@ti.com>
Subject: [PATCH v6 05/17] dmaengine: Add support for reporting DMA cached data amount
Date: Thu, 28 Nov 2019 12:59:33 +0200
Message-ID: <20191128105945.13071-6-peter.ujfalusi@ti.com> (raw)
In-Reply-To: <20191128105945.13071-1-peter.ujfalusi@ti.com>

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 0e8b426bbde9..c4c5219030a6 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;
 };
 
 /**
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki


  parent reply index

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-28 10:59 [PATCH v6 00/17] dmaengine/soc: Add Texas Instruments UDMA support Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 01/17] bindings: soc: ti: add documentation for k3 ringacc Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 02/17] soc: ti: k3: add navss ringacc driver Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 03/17] dmaengine: doc: Add sections for per descriptor metadata support Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 04/17] dmaengine: Add metadata_ops for dma_async_tx_descriptor Peter Ujfalusi
2019-11-28 10:59 ` Peter Ujfalusi [this message]
2019-11-28 10:59 ` [PATCH v6 06/17] dmaengine: ti: Add cppi5 header for K3 NAVSS/UDMA Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 07/17] dmaengine: ti: k3 PSI-L remote endpoint configuration Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 08/17] dt-bindings: dma: ti: Add document for K3 UDMA Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 09/17] dmaengine: ti: New driver for K3 UDMA - split#1: defines, structs, io func Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 10/17] dmaengine: ti: New driver for K3 UDMA - split#2: probe/remove, xlate and filter_fn Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 11/17] dmaengine: ti: New driver for K3 UDMA - split#3: alloc/free chan_resources Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 12/17] dmaengine: ti: New driver for K3 UDMA - split#4: dma_device callbacks 1 Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 13/17] dmaengine: ti: New driver for K3 UDMA - split#5: dma_device callbacks 2 Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 14/17] dmaengine: ti: New driver for K3 UDMA - split#6: Kconfig and Makefile Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 15/17] dmaengine: ti: k3-udma: Add glue layer for non DMAengine users Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 16/17] firmware: ti_sci: rm: Add support for tx_tdtype parameter for tx channel Peter Ujfalusi
2019-11-28 10:59 ` [PATCH v6 17/17] dmaengine: ti: k3-udma: Wait for peer teardown completion if supported Peter Ujfalusi

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