From: "Dan Horák" <dan@danny.cz>
To: linuxppc-dev@lists.ozlabs.org
Cc: amd-gfx@lists.freedesktop.org
Subject: amdgpu driver fails to initialize on ppc64le in 7.0-rc1 and newer
Date: Fri, 13 Mar 2026 14:23:51 +0100 [thread overview]
Message-ID: <20260313142351.609bc4c3efe1184f64ca5f44@danny.cz> (raw)
Hi,
starting with 7.0-rc1 (meaning 6.19 is OK) the amdgpu driver fails to
initialize on my Linux/ppc64le Power9 based system (with Radeon Pro WX4100)
with the following in the log
...
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: GART: 256M 0x000000FF00000000 - 0x000000FF0FFFFFFF
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: [drm] Detected VRAM RAM=4096M, BAR=4096M
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: [drm] RAM width 128bits GDDR5
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: iommu: 64-bit OK but direct DMA is limited by 0
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: dma_iommu_get_required_mask: returning bypass mask 0xfffffffffffffff
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: 4096M of VRAM memory ready
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: 32570M of GTT memory ready.
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: (-12) failed to allocate kernel bo
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: [drm] Debug VRAM access will use slowpath MM access
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: [drm] GART: num cpu pages 4096, num gpu pages 65536
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: [drm] PCIE GART of 256M enabled (table at 0x000000F4FFF80000).
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: (-12) failed to allocate kernel bo
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: (-12) create WB bo failed
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: amdgpu_device_wb_init failed -12
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: amdgpu_device_ip_init failed
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: Fatal error during GPU init
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: finishing device.
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: probe with driver amdgpu failed with error -12
bře 05 08:35:40 talos.danny.cz kernel: amdgpu 0000:01:00.0: ttm finalized
...
After some hints from Alex and bisecting and other investigation I have
found that https://github.com/torvalds/linux/commit/1471c517cf7dae1a6342fb821d8ed501af956dd0
is the culprit and reverting it makes amdgpu load (and work) again.
for the record, I have originally opened https://gitlab.freedesktop.org/drm/amd/-/issues/5039
With regards,
Dan
next reply other threads:[~2026-03-13 13:24 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-13 13:23 Dan Horák [this message]
2026-03-15 4:25 ` amdgpu driver fails to initialize on ppc64le in 7.0-rc1 and newer Ritesh Harjani
2026-03-15 9:50 ` Dan Horák
2026-03-16 21:02 ` Gaurav Batra
2026-03-25 12:12 ` Ritesh Harjani
2026-03-25 14:56 ` Gaurav Batra
2026-03-25 16:28 ` Gaurav Batra
2026-03-25 17:42 ` Ritesh Harjani
2026-03-25 20:00 ` Dan Horák
2026-03-26 10:29 ` Dan Horák
2026-03-26 10:38 ` Ritesh Harjani
2026-03-26 13:37 ` Gaurav Batra
2026-03-17 11:43 ` Ritesh Harjani
2026-03-17 14:31 ` Dan Horák
2026-03-17 22:34 ` Karl Schimanek
2026-03-16 13:55 ` Alex Deucher
2026-03-23 0:30 ` Timothy Pearson
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