Hello,

My FPGA is connected via PCIe to the host PC via a PCIe switch.
According to lspci, the FPGA is MSI enabled.

But - The FPGA has only legacy interrupt. The design does not support MSI at all.

Is it possible that somehow the PCIe switch "enabled" MSI ?

I ran:
and got rc!=0

Thank you,
Zvika

Hold on there.

You're looking at your FPGA and you know what you're talking about, but we don't.

We'd need a pretty full explanation of the project & equipment, brand names, etc. You probably have at least one paranoid manager who would consider publishing research data on a public forum a firing offence. And then we have the term MSI, which means there's probably comms of some description going on. So by answering your post we could have the doubtful pleasure of working for your boss for free, while you get the credit, and the pay.

That said, there's underlying circuitry in an FPGA, and that is probably MSI capable, even if your design is not. I don't understand what code you ran or what relevance the answer has, and I'm one of the few hardware guys here.

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Check any of your other FPGA threads, going back at least *THIRTEEN YEARS* now:
https://www.linuxquestions.org/quest...rrupts-686156/
https://www.linuxquestions.org/quest...hw-4175608928/
https://www.linuxquestions.org/quest...-a-4175617636/
https://www.linuxquestions.org/quest...er-4175632357/
https://www.linuxquestions.org/quest...ng-4175671805/
https://www.linuxquestions.org/quest...a-disk-948858/

In your previous threads, you claimed to have an "FPGA specialist". You also are *STILL* providing next to zero information about your device, OS, etc., past the facts that this is a totally custom piece of hardware with a custom kernel (apparently).

*AGAIN*:

• We do not have your custom hardware
• We do not have your custom OS
• We don't have ANY of your code
• We don't even know what this thing IS, or what it's supposed to do

Yet somehow you expect us to be able to help you?? You have been working on this for 13 years now...you rarely, if ever, post back or answer questions when asked. What do you think anyone is going to be able to help you with at this point, if you've had a 'team' working on this for 13 years and can't get it done?

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Hello,

Thank you for your reply.

I'm running centos 8.2 in root account.
Did not insert any driver I wrote yet (only centos default ones)
lspci reports MSI+

According to: https://www.kernel.org/doc/html/late...msi-howto.html
pci_disable_msi() is depracated and should not be used.
Should I try ?

Can you please tell what extra info is required ?

Best regards,
Zvika

You could have just TRIED IT faster than you posted back here, couldn't you???
You keep changing the story, and you have been *REPEATEDLY* asked to provide full information (for years at this point), and still don't, so what's the point in asking again?? And your story has now changed, since previously it's been a 'custom OS' for an embedded system, and yet now it's a stock CentOS 8 kernel.

*AGAIN*: you are running a custom OS, on custom hardware, using a custom kernel module. You *STILL* don't say what this mystery hardware is, what it does, or what this FPGA device is doing. You post no code, message(s)/error(s) that would let us know ANYTHING about your situation, yet you repeatedly are asking us for help. We *CANNOT* help you, since you have a 100% custom environment which you won't tell us anything about.

You have been working on this for *THIRTEEN YEARS* and claim to have an 'FPGA engineer' on your 'team'....so again, it's hard to see why you are posting on a forum when you have these resources available to you, and have all the knowledge of the environment which you *WILL NOT SHARE* with us.

He hasn't been working on the same project for 13 years, I'm pretty sure. But he does think we will provide help on something we know nothing about. I suppose I qualify as an FPGA engineer but I don't want his information. I'd have to spend days boning up before I could provide a few sentences of advice, free gratis and for nothing. And I'm retired.

If this is repeating for 13 years, why not report the thread? Oh, and if he can't do his job after 13 years, I'd fire that FPGA engineer. Come to think about it, it's hard to see how zvivered is earning his keep either… but I'd defer to management on that one.

Don't know about that; his post history says it's either the same thing, or something VERY similar. Either way, the OP claims to have an FPGA engineer on their 'team', and have developed kernel modules for this custom embedded hardware before. So given all that, I can't imagine why they'd post on a forum, given...
..this?? Agreed totally; they haven't provided info, and keep reiterating "Can you tell me what extra info is needed?" thing when asked.
I won't confirm or deny if I've had the same thoughts.

Hello,

I checked again. MSI in the FPGA is disabled (as it should be)

The reason request_irq returned an error is because the last parameter is NULL.

When I changed to :
rc=request_irq(pci_dev_s->irq, IrqHandlerPacket, IRQF_SHARED,"fio", pci_dev_s);
I got rc=0

Thank you,
Zvika

Great; and we still don't know anything about what you're doing, your code, hardware, or OS. So this information doesn't give us anything new, or let us understand anything further. Mark the thread SOLVED.

Next time, we'll let him sink without trace.

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