Re: [PATCH 00/18] dmaengine/soc: k3-udma: Add support for BCDMA and PKTDMA

From: Peter Ujfalusi
Date: Wed Sep 30 2020 - 06:17:42 EST

Hi,

On 30/09/2020 12.13, Peter Ujfalusi wrote:
> Hi,

for some reason I have missed Grygorii from the TO, sorry.

Grygorii: the series in lore:
https://lore.kernel.org/lkml/20200930091412.8020-1-peter.ujfalusi@xxxxxx/

> The series have build dependency on ti_sci/soc series (v1):
> https://lore.kernel.org/lkml/20200928083429.17390-1-peter.ujfalusi@xxxxxx/
>
> The unmapped event handling in INTA is also needed, but it is not a build
> dependency (v2):
> https://lore.kernel.org/lkml/20200930074559.18028-1-peter.ujfalusi@xxxxxx/
>
> The DMSS introduced within AM64 as a simplified Data movement engine is built
> on similar grounds as the K3 NAVSS and UDMAP, but with significant architectural
> changes.
>
> - Rings are built into the DMAs
> The DMAs no longer use the general purpose ringacc, all rings has been moved
> inside of the DMAs. The new rings within the DMAs are simplified to be dual
> directional compared to the uni-directional rings in ringacc.
> There is no more of a concept of generic purpose rings, all rings are assigned
> to specific channels or flows.
>
> - Per channel coherency support
> The DMAs use the 'ASEL' bits to select data and configuration fetch path. The
> ASEL bits are placed at the unused parts of any address field used by the
> DMAs (pointers to descriptors, addresses in descriptors, ring base addresses).
> The ASEL is not part of the address (the DMAs can address 48bits).
> Individual channels can be configured to be coherent (via ACP port) or non
> coherent individually by configuring the ASEL to appropriate value.
>
> - Two different DMAs (well, three actually)
> PKTDMA
> Similar to UDMAP channels configured in packet mode.
> The flow configuration of the channels has changed significantly in a way that
> each channel have at least one flow assigned at design time and each flow is
> directly mapped to corresponding ring.
> When multiple flows are set, the channel can only use the flows within it's
> assigned range.
> PKTDMA also introduced multiple tflows which did not existed in UDMAP.
>
> BCDMA
> It has two types of channels:
> - split channels (tchan/rchan): Similar to UDMAP channels configured in TR mode.
> - Block copy channels (bchan): Similar to EDMA or traditional DMA channels, they
> can be used for mem2mem type of transfers or to service peripherals not
> accessible via PSI-L by using external triggers for the TR.
> BCDMA channels do not have support for multiple flows
>
> With the introduction of the new DMAs (especially the BCDMA) we also need to
> update the resource manager code to support the second range from sysfw for
> UDMA channels.
>
> The two outstanding change in the series in my view is
> the handling of the DMAs sideband signal of ASEL to select path to provide
> coherency or non coherency.
>
> the smaller one is the device_router_config callback to allow the configuration
> of the triggers when BCDMA is servicing a triggering peripheral to solve a
> chicken-egg situation:
> The router needs to know the event number to send which in turn depends on the
> channel we got for servicing the peripheral.
>
> I'm sending this series as early as possible to have time for review and
> changes.
>
> When all things resolved, it would be nice if Santosh could create an immutable
> branch with the ti_sci/soc patches for Vinod to use for this series.
>
> Regards,
> Peter
> ---
> Grygorii Strashko (1):
> soc: ti: k3-ringacc: add AM64 DMA rings support.
>
> Peter Ujfalusi (16):
> dmaengine: of-dma: Add support for optional router configuration
> callback
> dmaengine: Add support for per channel coherency handling
> dmaengine: doc: client: Update for dmaengine_get_dma_device() usage
> dmaengine: dmatest: Use dmaengine_get_dma_device
> dmaengine: ti: k3-udma: Wait for peer teardown completion if supported
> dmaengine: ti: k3-udma: Add support for second resource range from
> sysfw
> dmaengine: ti: k3-udma-glue: Add function to get device pointer for
> DMA API
> dmaengine: ti: k3-udma-glue: Configure the dma_dev for rings
> dt-bindings: dma: ti: Add document for K3 BCDMA
> dt-bindings: dma: ti: Add document for K3 PKTDMA
> dmaengine: ti: k3-psil: Extend psil_endpoint_config for K3 PKTDMA
> dmaengine: ti: k3-psil: Add initial map for AM64
> dmaengine: ti: Add support for k3 event routers
> dmaengine: ti: k3-udma: Initial support for K3 BCDMA
> dmaengine: ti: k3-udma: Add support for BCDMA channel TPL handling
> dmaengine: ti: k3-udma: Initial support for K3 PKTDMA
>
> Vignesh Raghavendra (1):
> dmaengine: ti: k3-udma-glue: Add support for K3 PKTDMA
>
> .../devicetree/bindings/dma/ti/k3-bcdma.yaml | 183 ++
> .../devicetree/bindings/dma/ti/k3-pktdma.yaml | 189 ++
> Documentation/driver-api/dmaengine/client.rst | 4 +-
> drivers/dma/dmatest.c | 13 +-
> drivers/dma/of-dma.c | 10 +
> drivers/dma/ti/Makefile | 3 +-
> drivers/dma/ti/k3-psil-am64.c | 75 +
> drivers/dma/ti/k3-psil-priv.h | 1 +
> drivers/dma/ti/k3-psil.c | 1 +
> drivers/dma/ti/k3-udma-glue.c | 294 ++-
> drivers/dma/ti/k3-udma-private.c | 39 +
> drivers/dma/ti/k3-udma.c | 1975 +++++++++++++++--
> drivers/dma/ti/k3-udma.h | 27 +-
> drivers/soc/ti/k3-ringacc.c | 325 ++-
> include/linux/dma/k3-event-router.h | 16 +
> include/linux/dma/k3-psil.h | 16 +
> include/linux/dma/k3-udma-glue.h | 12 +
> include/linux/dmaengine.h | 14 +
> include/linux/soc/ti/k3-ringacc.h | 17 +
> 19 files changed, 2994 insertions(+), 220 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/dma/ti/k3-bcdma.yaml
> create mode 100644 Documentation/devicetree/bindings/dma/ti/k3-pktdma.yaml
> create mode 100644 drivers/dma/ti/k3-psil-am64.c
> create mode 100644 include/linux/dma/k3-event-router.h
>

- Péter

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