videobuf_vmalloc Deprecated

[PseudoResonance]

Videobuf has long been deprecated, and now Arch kernel 6.4 has removed the videobuf_vmalloc module that this project depends on. CONFIG_VIDEOBUF_VMALLOC=m on line 5844

[NuiceT]

I just noticed when trying to run make load:

root@elgato:~/sc0710# make load
make -C /lib/modules/5.15.0-78-generic/build M=/root/sc0710 modules
make[1]: Entering directory '/usr/src/linux-headers-5.15.0-78-generic'
make[1]: Leaving directory '/usr/src/linux-headers-5.15.0-78-generic'
sudo dmesg -c >/dev/null
sudo cp /dev/null /var/log/debug
#sudo modprobe videobuf2-core
sudo modprobe videobuf2-common
sudo modprobe videodev
#sudo modprobe videobuf-dma-sg
sudo modprobe videobuf-vmalloc
sudo insmod ./sc0710.ko \
	thread_dma_poll_interval_ms=2 \
	dma_status=0
insmod: ERROR: could not insert module ./sc0710.ko: Unknown symbol in module
make: *** [Makefile:26: load] Error 1

[pborrell]

I'm hoping someone can beat me to forcing this to upgrade as I only have maybe an hour a week to devote to hacking drivers in Linux. But I'm looking at this as a challenge accepted moment.

[ApolloXI14]

Try changing videobuf-vmalloc to videobuf2-vmalloc

[PseudoResonance]

That's not how this works unfortunately. Videobuf2 and videobuf are incompatible and you can't just quickly swap it out. It requires a not insignificant amount of rewriting the driver. Here's something that describes a few of these differences.

[stoth68000]

I have a lot going on with work, I can’t look at this anytime soon. This is one of many pet projects for me, just the reality of life.

I acknowledge the ongoing discussion, I’m just in no position to work on it. If you need the driver to work, use a kernel it was developed against. My last update added support for a recent Ubuntu distribution, detail are probably in the commits.

• Steve

On Tue, Sep 19, 2023 at 03:43 Josh @.***> wrote:

That's not how this works unfortunately. Videobuf2 and videobuf are incompatible and you can't just quickly swap it out. It requires a not insignificant amount of rewriting the driver.

— Reply to this email directly, view it on GitHub https://github.com/stoth68000/sc0710/issues/17#issuecomment-1724991240, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEEERBCVBLHREAMSD5GLQVDX3FEKPANCNFSM6AAAAAA4NKPCCA . You are receiving this because you are subscribed to this thread.Message ID: @.***>

[pborrell]

Try changing videobuf-vmalloc to videobuf2-vmalloc

I looked at that, and based on the structures, of 1 and 2

They aren't drop in replacements. Steve, I feel where you're coming from with the lot of work going on if I had 120 hours to devote to this I could most likely update it myself, but with the changes to the queue system alone. With small amounts of work here and there, it would most likely take me a few months to move the queue to the non-deprecated system, let alone the malloc and the buffer.

[stoth68000]

Steve, I feel where you're coming from with the lot of work going on if I had 120 hours to devote to this I could most likely update it myself, but with the changes to the queue system alone. With small amounts of work here and there, it would most likely take me a few months to move the queue to the non-deprecated system, let alone the malloc and the buffer.

Indeed, it's just volunteer work, very low priority for me right now.

We do what we can - when we can.

-- Steven Toth - Kernel Labs http://www.kernellabs.com +1.646.355.8490

[pborrell]

I'm looking through the headers and the c code and at least it seems that most of it is already using video for linux 2 implementations. So it's not a full rewrite.

[ApolloXI14]

Thanks for the answer and article Josh and looking further into this Peter. I'm new to V4L and kernel modules myself and wanted to help since I just started using this Elgato and am happy with it, but I am disappointed in the lack of official Linux support, which encouraged me to start digging myself lately, which brought me here. Impressed and grateful for what you've already done Steve.

[PseudoResonance]

If you want, here's an example of a rewrite I found. sh_vou videobuf2 rewrite. Kinda gives an idea of the work required. Doesn't look too bad, but would also require a decent understanding of the kernel and V4L2, which I unfortunately don't know much about. Maybe if I have time...