[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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https://bugs.freedesktop.org/show_bug.cgi?id=107516

            Bug ID: 107516
           Summary: Firefox for WebGL fallbacks to swrast_dri.so, not
                    using radeon_si.so
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: bugs.freedesktop.org@pm.port0.org

With recent build of libdrm (2.4.93) Mozilla Firefox cannot use accelerated
WebGL, use software emulation instead.

HW. AMD RX560 and AMD WX2100 (RX550).

SW. Ubuntu 16.04 with kernels 4.17.X and 4.18.rc from
http://kernel.ubuntu.com/~kernel-ppa/mainline/, plus Oibaf's PPA builds of drm,
mesa, etc. https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers

Symptoms. Firefox works OK, but on site with WebGL it works very slow - due to
fallback to software GL rendering.

Note. about:support page in Firefox DOES show correct driver info:
WebGL 1 Driver Renderer X.Org -- AMD Radeon Pro WX2100 (POLARIS12, DRM 3.26.0,
4.18.0-041800rc6-generic, LLVM 6.0.1)

But, on WebGL site (ex. windy.com), swrast_dri.so get loaded and eats all CPU
cores.

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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https://bugs.freedesktop.org/show_bug.cgi?id=107516

--- Comment #1 from Mike <bugs.freedesktop.org@pm.port0.org> ---
Possibly related to bugs 107384 and/or 98629.

If firefox start with LIBGL_DEBUG=verbose parameter, it shows:
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: unable to load driver: amdgpu_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: amdgpu

I.e. it cannot retrieve device info (and name of driver as "radeonsi"), trying
to load non-existant amdgpu_dri.so, then fallbacks to swrast_dri.so

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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https://bugs.freedesktop.org/show_bug.cgi?id=107516

Mike <bugs.freedesktop.org@pm.port0.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=107384

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=107516

Mike <bugs.freedesktop.org@pm.port0.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=98629

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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https://bugs.freedesktop.org/show_bug.cgi?id=107516

--- Comment #2 from Mike <bugs.freedesktop.org@pm.port0.org> ---
One more thing. This bug might be firefox-specific, because other OpenGL apps,
say, glxgears, use correct driver and get HW accel.

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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https://bugs.freedesktop.org/show_bug.cgi?id=107516

--- Comment #3 from Emil Velikov <emil.l.velikov@gmail.com> ---
The FF sandboxing is fairly, ahem, strange. The following Mozilla bug addresses
that.

https://bugzilla.mozilla.org/show_bug.cgi?id=1480755#c1

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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https://bugs.freedesktop.org/show_bug.cgi?id=107516

--- Comment #4 from Mike <bugs.freedesktop.org@pm.port0.org> ---
(In reply to Emil Velikov from comment #3)
> https://bugzilla.mozilla.org/show_bug.cgi?id=1480755#c1

Indeed, this is Firefox's problem.

Аlthough security.sandbox.content.read_path_whitelist trick didn't work for me,
I think this bug should be resolved as INVALID.

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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https://bugs.freedesktop.org/show_bug.cgi?id=107516

Mike <bugs.freedesktop.org@pm.port0.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTOURBUG

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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https://bugs.freedesktop.org/show_bug.cgi?id=107516

--- Comment #5 from Mike <bugs.freedesktop.org@pm.port0.org> ---
PS. security.sandbox.content.read_path_whitelist works.
Need to add /sys/ (with trailing slash, as
https://wiki.mozilla.org/Security/Sandbox says), and restart Firefox.

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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https://bugs.freedesktop.org/show_bug.cgi?id=107516

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kai@dev.carbon-project.org

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
*** Bug 107660 has been marked as a duplicate of this bug. ***

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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--- Comment #7 from Michel Dänzer <michel@daenzer.net> ---
Emil, as it might take a while for users to get the related Firefox sandbox
change, would it be possible for libdrm to fall back to the same method that
worked before?

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[Bug 107516] Firefox for WebGL fallbacks to swrast_dri.so, not using radeon_si.so

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Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|DRM/AMDgpu                  |libdrm

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--- Comment #8 from Gian-Carlo Pascutto <gcp@sjeng.org> ---
To clarify the underlying cause of this:

>Earlier commit reworked our sysfs handling to use realpath.
>Sadly that backfired since the Firefox sandboxing mechanism rejects
>that. Despite the files/folders being in the allowed list, of the
>sandboxing mechanism.

The problem is that the underlying implementation of realpath() in libc will
issue lstat calls on each of the path components. In Mesa's case, this will
cause it to try to stat /sys, which is not on the list of allowed paths. This
in turn causes the realpath() call to fail. If this failure isn't handled
things broke.

Firefox 62 and later will now specifically allow the stat call (only).

>Oddly enough, the Chromium sandboxing doesn't complain about any of
>this.

I'm not sure how much of Chromium's GPU sandbox is enabled by default (on
non-Chromebooks), but they literally just did the same fix as we did a few days
ago:
https://chromium.googlesource.com/chromium/src/+/8655d49f657d3878c937f1387b3d31fa66c8e76a%5E%21/content/gpu/gpu_sandbox_hook_linux.cc

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