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chromium: Build with VA-API but disable it by default #85253

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merged 1 commit into from Apr 18, 2020
Merged

chromium: Build with VA-API but disable it by default #85253

merged 1 commit into from Apr 18, 2020

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primeos
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@primeos primeos commented Apr 14, 2020 •
edited

This makes it possible to enable VA-API without having to rebuild
Chromium.

Co-Authored-By: ElXreno elxreno@gmail.com
Co-Authored-By: misuzu bakalolka@gmail.com

Motivation for this change

Alternative implementation of #85076. Solves the VA-API part of #82443.

Advantages:

  • Doesn't require --ignore-gpu-blacklist, i.e. VA-API can be configured independently of other GPU features
  • Will explicitly break all existing VA-API setups (vs. silently). Bonus: We could add instructions via a throw statement.
  • Doesn't interfere with commandLineArgs. I.e. we don't accidentally enable VA-API if that argument is set.

Disadvantages:

  • More complex!

TODOs:

Tests:

  • On a working VA-API setup
  • Without any VA-API drivers
  • With XWayland (expected: VA-API doesn't work, depending on the driver)
    • enableVaapi = false: Works as expected
      • Only drawback: Additionally prints vaInitialize failed: unknown libva error
      • But: chrome://gpu now even shows the correct Video Decode information: Unavailable -> Software only. Hardware acceleration disabled
    • enableVaapi = true: Wrong VA information, but ok
      • The same as before, but chrome://gpu now incorrectly shows Video Decode: Hardware accelerated (despite the libva error and VA not actually working)
  • Optional: In a VM (virtio)
  • Invalid LIBVA_DRIVER_NAME value: Fallback to SW rendering (only wrong VA information shown, like in the second XWayland case)
  • VA-API on radeon almost works now (at least on my old HD 6950) \o/
    • Was broken before, probably fixed in the meantime by a Mesa update
    • Update: There are some minor visual glitches left at the bottom of the screen but it's watchable (vs. completely visually broken as before)
  • Tested drivers: i965, iHD, and r600 (some visual glitches with VA-API, but ok)

Note: We could also add chromium-vaapi but I'd like to avoid that for now (as we're still experimenting with it).

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.

@primeos primeos mentioned this pull request Apr 14, 2020
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@primeos primeos mentioned this pull request Apr 14, 2020
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@offlinehacker
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For some reason I tought this was already enabled. I think we should build with va-api by default, it's pretty common feature.

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primeos commented Apr 15, 2020

I added some minor improvements but it's basically a refactoring except for the Ozone "fix" and added deprecation note via throw (but the derivations for chromium and chromium.override { enableVaapi = true; } remain unchanged).

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primeos commented Apr 15, 2020 •
edited

@thefloweringash nearly forgot to ask: Could you test this on AArch64 to see if the build still works or if we have to disable VA-API there?

Edit: Apart from that this PR is ready for review :)

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I'm not sure what to make of this.

On Aarch64 it does build and run, but the GPU thread crashes during startup and prints a backtrace including VADisplayState::Initialize. Inspecting chrome://gpu shows the following warning:

GPU process was unable to boot: GPU process crashed too many times with SwiftShader.
Disabled Features: all

Software webgl is no longer available. This happens even with the default chromium running with --disable-accelerated-video-decode --disable-accelerated-video-encode.

This could be a symptom of my particular graphics stack. I only have one graphical system to test this on at the moment and I'm using the panfrost driver which IIUC is still under active development.

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primeos commented Apr 16, 2020

@thefloweringash huge thanks for your testing, that's very helpful! As for AArch64 I decided to disable VA-API for now as I'm not sure if we could get this to work properly across all platforms or if we even package VA-API drivers for GPUs on ARM systems.

If you have time for it: Could you test the new version of this PR again (which would also cover #85360) to verify that the regressions are gone. The only difference for AArch64 should now be the additional --disable-accelerated-video-decode --disable-accelerated-video-encode flags (could be avoided as well but then we might risk enabling VA-API at runtime if we should build it for AArch64 in the future).

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primeos commented Apr 16, 2020

Note: I'll try to run some more tests on x86_64, seems like this change is more complicated than anticipated. I also realized that I did only test this on systems where I tested VA-API before and it's properly supported. I'll try to test the following cases as well:

  • Without any VA-API drivers
  • With XWayland (doesn't work, depending on the driver)
  • Optional: In a VM

@primeos primeos mentioned this pull request Apr 16, 2020
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@thefloweringash
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Tested on aarch64: some browsing, youtube and software webgl are working. LGTM.

@primeos
chromium: Build with VA-API but disable it by default
267eefc 
This makes it possible to enable VA-API without having to rebuild
Chromium: `chromium.override { enableVaapi = true; }`
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primeos commented Apr 18, 2020

My testing on x86_64 didn't show any important regressions, let's hope this'll work well with any GPU+driver combination (at least for the default case with enableVaapi = false). Also this PR should at least avoid the regressions from the last PR since we disable VA-API at runtime by default for now.

I'll merge it now 🎉

Note: The last force-push was just to clean up the history (rebase+squashing - no other changes).

@primeos primeos merged commit 34643fc into NixOS:master Apr 18, 2020
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offlinehacker commented Apr 18, 2020 •
edited

enableVaapidoes not seem to be passed to mkChromiumDerivation

https://github.com/primeos/nixpkgs/blob/267eefcdb7e1ee2b0c8e1714b29125517474f54f/pkgs/applications/networking/browsers/chromium/default.nix#L37

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primeos commented Apr 18, 2020

@offlinehacker that's intentional, it only affects the wrapper ;)

@primeos primeos mentioned this pull request Jun 16, 2020
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