GNU/Linux & PCI (Express): Part 10 - Accessing PCI(e) IO ports from userspace

#GNU #Linux #PCIe #PCI #Programming #Tutorial #foss
In this series I already covered how to access the config and memory space of a PCI or PCI Express device from userspace. So, there is one address space missing. In this video I will show you how to access the IO ports of a PCI or PCI Express devices from userspace in a simple C application. Enjoy!
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[@paulov9626]

WunderBAR 😉 Really nice series of tuts, no nonsense just plain, interesting info. Subscribed.

[@Alperic27]

‘gnu slash linux’ …. 🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️🤦‍♂️ jezzzz that is profoundly stupid…

[@maximerkhov4164]

Very nice explanation as usual, thank you for another great video! Aren't there any plans for creating userspace drivers with the use of VFIO? It would be incredibly interesting!

[@johannes4gnu_linux96]

Thanks.
No concret plans but I am currently preparing a Video on uio for the near Future.

[@ShreyaMandal-f7b]

Thanks Johannes for the wonderful explanation. Here why are you not using mmap() ? Is mmap() not possible here or you are trying out a different method ? Are these address space different from memory address space ?

[@johannes4gnu_linux96]

@@ShreyaMandal-f7b you are welcome ;) you can only memory map memory but Not io Ports. Thats why I am using the io functions here.
But modern devices don't use Classic io Ports any longer. Instead they are using memory mapped io (mmio) which can bei accessed with mmap.

[@Skren-uf8dq]

Wow, this is really cool! Thank you so much for this!!

[@rodrigoolmos9202]

Great job dude 😊

[@lihtbarraovermelho7928]

very good

[@Ninja_Sh11]

Nice explanation.. Thanks Team