Question about MSI interrupt in PCIe for C6678

ZAKARIA BOURZOUK

Intellectual 560 points

Other Parts Discussed in Thread: SYSBIOS

Hi,

I'am work on communication between three DSP ( two as an EP and one as RC ) with PCIe.

the both EP send the interruption to the RC :

* EP1 send interrupt to the Core_0 of the RC ( the EP1 send MSI_0)

* EP2 send interrupt to the Core_1 of the RC ( the EP2 send MSI_1)

I launch the both Core ( 0 and 1 ) of the RC , then i launch the EP1 and an error appears in the console :

>> ti.sysbios.gates.GateMutex: line 92: assertion failure: A_badContext: bad calling context. See GateMutex API doc for details.
xdc.runtime.Error.raise: terminating execution

so, I want to know if it is possible to acheive this scenario : two EP send interrupt to two Core of RC ?

if yes, what is means the error displayed in the console ?

thank you,

Sincerely,

Zakaria.

over 9 years ago

0 Ganapathi Dhandapani95 over 9 years ago

TI__Mastermind 28085 points

Hi,

Yes, it is possible. Please refer to CorePac primary interrupt able in C66xx data manual. C6678 device have 8 cores, each core will receive separate MSI INTs, that only C6678 have exactly eight MSI group. CorePac 0 will only receive interrupt from MSI_0 (vectors 0/8/16/24). Similarly, Core1 will receive MSI_1 (vectors 1/9/17/25), Core 7 will receive MSI_7, etc

The status of each MSI vector will be shown in the corresponding bit in the MSI status registers (for example, MSI0_IRQ_STATUS register, bit0 is for vector 0, bit 1 is for vector 8, bit 2 is for vector 16 and bit 3 is for vector 24).

In C6657, we can only use MSI_INT0/4 for Core0 and MSI_INT1/5 for Core1. And the other setup should be similar as your current single core setup. You can do the same for Core1 but use the correct MSI interrupt/vector numbers.

There are several threads discussing about PCIe MSI interrupt. Please take a look and hope they could cover your questions.
e2e.ti.com/.../825032
e2e.ti.com/.../978205

Thanks,

0 ZAKARIA BOURZOUK over 9 years ago in reply to Ganapathi Dhandapani95

Intellectual 560 points

HI,
I know what you said Mr. Ganapathi . So, what is means the error displayed in the console ?

>> ti.sysbios.gates.GateMutex: line 92: assertion failure: A_badContext: bad calling context. See GateMutex API doc for details.
xdc.runtime.Error.raise: terminating execution

thank you,

Sincerely,

Zakaria.

0 Ganapathi Dhandapani95 over 9 years ago in reply to ZAKARIA BOURZOUK

TI__Mastermind 28085 points

Hi,

Take a look at below wiki link and similar threads, it will help you:
processors.wiki.ti.com/.../GateMutex_Assert
e2e.ti.com/.../238059
e2e.ti.com/.../198234

Thanks,

0 ZAKARIA BOURZOUK over 9 years ago in reply to Ganapathi Dhandapani95

Intellectual 560 points

OKey, thank you Mr. Ganapathi

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Question about MSI interrupt in PCIe for C6678