PCIe transfer rate using EDMA in the filetest demo

Hi,

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It is not a expected PCIe throughput test result with EDMA. C6655 have single DSP core only. Desktop Linux support C6678 devices only.

The Linux host loader Example only works on Linux PC. Please refer “\ti\mcsdk_x_xx_xx_xx\tools\boot_loader\examples\pcie\docs\Readme.pdf” document for more information.

Thanks,

Like I said in my previous post, we have ported the Desktop linux SDK to support the C6655. We have no problems using the SDK to transfer data to and from the DSP using either the memcpy or the CMEM approach. We managed to get EDMA to work simply by setting the EDMA_TPCC0_BASE_ADDRESS base address to 0x0274000. However, I am getting poor transfer rate when using small payloads.

Also, I have tried to compile the Linux host loader example for the C6655. I have enabled the EDMA_INTC_DEMO and the EVMC6657L defines but I am getting the following compilation errors:

/extra/opt/ti/mcsdk_2_01_02_06/tools/boot_loader/examples/pcie/linux_host_loader/pciedemo.c: In function 'init_module':
/extra/opt/ti/mcsdk_2_01_02_06/tools/boot_loader/examples/pcie/linux_host_loader/pciedemo.c:1640:12: error: 'pcieInterrupt' undeclared (first use in this function)
   pushData(pcieInterrupt, 0, &bootEntryAddr);
            ^
/extra/opt/ti/mcsdk_2_01_02_06/tools/boot_loader/examples/pcie/linux_host_loader/pciedemo.c:1640:12: note: each undeclared identifier is reported only once for each function it appears in
/extra/opt/ti/mcsdk_2_01_02_06/tools/boot_loader/examples/pcie/linux_host_loader/pciedemo.c:1573:20: warning: ignoring return value of 'pci_enable_device', declared with attribute warn_unused_result [-Wunused-result]
   pci_enable_device(PCIE_DEV);
                    ^
/extra/opt/ti/mcsdk_2_01_02_06/tools/boot_loader/examples/pcie/linux_host_loader/pciedemo.c:1597:14: warning: ignoring return value of 'request_irq', declared with attribute warn_unused_result [-Wunused-result]
   request_irq(irqNo, ISR_handler, IRQF_SHARED, "TI 667x PCIE", &dummy);
              ^
make[2]: *** [/extra/opt/ti/mcsdk_2_01_02_06/tools/boot_loader/examples/pcie/linux_host_loader/pciedemo.o] Error 1
make[1]: *** [_module_/extra/opt/ti/mcsdk_2_01_02_06/tools/boot_loader/examples/pcie/linux_host_loader] Error 2

So, I can't test using that demo either.

Regards,

- David

Hi,

I managed to modify the pcieboot_interrupt CCS project for the C6657 and use the linux_host_loader example to transfer PCIe data using EDMA. Now, I wanted to port the logic from the pcieboot_interrupt example (the interrupt handler) to SYS/BIOS.

I need to map the PCIEXpress_Legacy_INTA (Secondary Interrupts for C66x CorePacs) to one of the interrupt controller output. From what I can understand, this should be done using the CpIntc API and use the Hwi API to map the returned event Id to an actual ISR function. However, I can't get this to work.

I am using the following code to initialize and trap the ISR. Any help in investigating my issue will be greatly appreciated.

Regards,

#define PCIE_EP_IRQ_SET              0x21800064
#define PCIEXpress_Legacy_INTA               50

#define HOST_INT  3
#define HWI_INT  4

void MyIsrFunction(UArg intNum)
{
  printf    ("DSP receives interrupt from host.\n");

  Hwi_clearInterrupt(intNum);
  *((uint32_t *)PCIE_EP_IRQ_SET) = 0x1;
  printf    ("DSP generates interrupt to host.\n");

}

void EnableSysInterrupt()
{
  UInt32 cookie = Hwi_disable();

  CpIntc_mapSysIntToHostInt(0, PCIEXpress_Legacy_INTA, HOST_INT); 
  CpIntc_dispatchPlug(PCIEXpress_Legacy_INTA, &MyIsrFunction, PCIEXpress_Legacy_INTA, TRUE);
  CpIntc_enableHostInt(0, HOST_INT);
  CpIntc_clearSysInt(0, PCIEXpress_Legacy_INTA);

  int eventId = CpIntc_getEventId(HOST_INT);                                          // get the event id for host interrupt 8

  Hwi_Params params;
  Hwi_Params_init(&params);
  params.arg = HOST_INT;
  params.eventId = eventId;      
  params.enableInt = TRUE;       
  Hwi_Handle hdl = Hwi_create(HWI_INT, &CpIntc_dispatch, &params, NULL);      // plug interrupt vector 4, make sure function here is the CpIntc_dispatch

  Hwi_enableInterrupt(HWI_INT);

  CpIntc_enableAllHostInts(0);

  /* Restore interrupts */
  Hwi_restore(cookie);

  printf("sys(%d) -> host(%d) -> eventId(%d) -> Hwi(%d)\n", PCIEXpress_Legacy_INTA, HOST_INT, eventId, HWI_INT);
}

Thanks for your update.