SRIO with CPPI (Problems closing CPPI)

Bernd Erbe

Expert 2065 points

Hello,

I've a small program for packetDMA with the MulticoreNavigator:

-open CPPI with 1 Rx-Channel, Flow, ...
-transfer some data with packetDMA
-close Rx-Channel, CPPI close & exit

Now integrating the SRIO-Example, it's not possible with the SRIO_init to execute the packetDMA twice as the CPPI_exit fails. Program flow is as follows:

-open CPPI with 1 Rx-Channel, Flow, ...
-transfer some data with packetDMA
-execute SRIO_deviceInit
-execute SRIO_init() -> opens 16 Rx-Channels
-close Rx-Channel, CPPI close & exit (now this fails)

Executing the program ones again, packetDMA stucks while receiving packets. I tried to close the SRIO-Rx-channels manually and then close the SRIO-CPPI-Handle (gSRIODriverMCB.cppiHnd). But this close fails with errorCode -128 (not all Rx-Channels closed).

It's not possible to get the opened Rx-Channels, isn't? How can all SRIO-Setup for CPPI be closed to avoid dependencies to other units using CPPI? I was not able to found any method, whether in the SRIO LLD nor in the CPPI to close any open items.

Any suggestions?

Regards,
Bernd

over 12 years ago

0 John Dowdal over 12 years ago

TI__Intellectual 2180 points

For the following steps:

-open CPPI with 1 Rx-Channel, Flow, ...
-transfer some data with packetDMA

-close Rx-Channel, CPPI close & exit (now this fails)

Which Cppi_cpDmaInitCfg.dmaNum are you using?

0 Bernd Erbe over 12 years ago in reply to John Dowdal

Expert 2065 points

Hello John,

1) for Cppi_init / open the "Cppi_GlobalConfigParams cppiGblCfgParams" from the examples pdk_C6678_1_0_0_21\packages\ti\drv\cppi\device is used. Therefore the same dmaNum as for the SRIO_init is used

2) As in the Multicore Navigator Example for PacketDMA, for everything about the channels a Cppi_RxChInitCfg is used and only these 2 params are set:

rxChCfg.channelNum = CPPI_PARAM_NOT_SPECIFIED;
rxChCfg.rxEnable = Cppi_ChState_CHANNEL_DISABLE;

Regards,
Bernd

0 John Dowdal over 12 years ago in reply to Bernd Erbe

TI__Intellectual 2180 points

If both the user application and the SRIO LLD are using Cppi_CpDma_SRIO_CPDMA, then the CPPI LLD will not let the CPPI be closed until all the channels in SRIO are closed.

However, if your application is trying to perform data transfers (memory to memory) using a packet DMA, then your application should use Cppi_CpDma_QMSS_CPDMA.

Are you intentionally opening the SRIO CPDMA yourself, or was the selection of the specific DMA unintended?

0 Bernd Erbe over 12 years ago in reply to John Dowdal

Expert 2065 points

Hello John,

sorry, I've explained that in a wrong way. For Cppi_init, the structure from pdk_C6678_1_0_0_21\packages\ti\drv\cppi\device is used which initializes SRIO_CPDMA, PASS_CPDMA_DMA and QMSS_CPDMA as well.

Then for the packetDMA-example, only QMSS_CPDMA is openend and the SRIO driver (device_init) only opens SRIO_CPDMA (both with Cppi_open). Therefore I think that's not the error as the dma.Num is different.

Regards,
Bernd

0 Bernd Erbe over 12 years ago in reply to Bernd Erbe

Expert 2065 points

Hello John,

are there any news about that topic? I really need a solution to close the CPPI both for SRIO and PacketDMA complete to be able to restart the program.

Regards,
Bernd

0 one and zero over 12 years ago in reply to Bernd Erbe

TI__Mastermind 18136 points

Hi John,

I believe the issue is that the SRIO LLD is not closing the CPPI. Looking at the SRIO LLD Source I can see that CPPI_open is called and also Cppi_rxChannelOpen. But nowhere in the LLD CPPI_closed is called. Am I missing something here or is this a bug in the LLD?

Kind regards,

one and zero

0 John Dowdal over 12 years ago in reply to one and zero

TI__Intellectual 2180 points

I wrote a bug tracking ticket for this which will become visible at https://cqweb.ext.ti.com/cqweb/main?command=GenerateMainFrame&service=CQ&schema=SDO-Web&contextid=SDOWP&entityID=SDOCM00096412&entityDefName=IncidentReport&username=readonly&password=readonly.

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SRIO with CPPI (Problems closing CPPI)