[Bug 104837] 'radeonsi: Failed to create context' with 32 bit applications

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104837

            Bug ID: 104837
           Summary: 'radeonsi: Failed to create context' with 32 bit
                    applications
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: rafael.ristovski at gmail.com

Created attachment 137021
  --> https://bugs.freedesktop.org/attachment.cgi?id=137021&action=edit
dmesg log

Running 32bit OpenGL applications on my AMD card with DRI_PRIME=1 produces the
following error, running 64bit applications works just fine.
Somehow I suspect virtual memory is the cause.

libGL: pci id for fd 5: 1002:6823, driver radeonsi
libGL: OpenDriver: trying /usr/lib32/dri/tls/radeonsi_dri.so
libGL: OpenDriver: trying /usr/lib32/dri/radeonsi_dri.so
/usr/share/libdrm/amdgpu.ids version: 1.0.0
radeonsi: Failed to create a context.
libGL: Using DRI3 for screen 0
radeonsi: Failed to create a context.
X Error of failed request:  BadValue (integer parameter out of range for
operation)
  Major opcode of failed request:  154 (GLX)
  Minor opcode of failed request:  3 (X_GLXCreateContext)
  Value in failed request:  0x0
  Serial number of failed request:  31
  Current serial number in output stream:  33

At the same time, the following messages are logged in dmesg:
(See similar but apparently harmless:
https://bugs.freedesktop.org/show_bug.cgi?id=104082)

[433611.485600] amdgpu 0000:03:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[433611.485602] amdgpu 0000:03:00.0: swiotlb: coherent allocation failed,
size=2097152

Full relevant dmesg log of the accident is attached

Various VRAM/GTT info from boot:

[   10.485945] [drm] amdgpu kernel modesetting enabled.
[   10.486189] amdgpu 0000:03:00.0: enabling device (0000 -> 0003)
[   10.669296] amdgpu 0000:03:00.0: VRAM: 2048M 0x000000F400000000 -
0x000000F47FFFFFFF (2048M used)
[   10.669298] amdgpu 0000:03:00.0: GTT: 1024M 0x0000000000000000 -
0x000000003FFFFFFF
[   10.669387] [drm] amdgpu: 2048M of VRAM memory ready
[   10.669388] [drm] amdgpu: 3072M of GTT memory ready.
[   10.670190] amdgpu 0000:03:00.0: PCIE GART of 1024M enabled (table at
0x000000F400040000).
[   10.685934] [drm] amdgpu: dpm initialized
[   11.043323] [drm] Initialized amdgpu 3.23.0 20150101 for 0000:03:00.0 on
minor 1

Sysinfo:

- Gentoo x86_64
- llvm/clang/mesa/libdrm and friends, including drivers all pulled from git as
of ~2 days ago.

- Intel HD 4400 Gen7.5 Haswell - i915
- AMD Radeon HD 8850M - amdgpu
- Both drivers are using DRI3 for PRIME

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