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| author | Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com> | 2026-05-05 09:05:37 +0800 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2026-05-11 17:53:31 -0400 |
| commit | 183182235f6d53bac62c6c39014738a54a68dfa6 (patch) | |
| tree | b71b6d7b81f08e9f11715d3b2327348c823ea98c /tools/perf/scripts/python/exported-sql-viewer.py | |
| parent | 0071e01c61aa73f22edd5252f0a3e2c2eff744d6 (diff) | |
| download | linux-183182235f6d53bac62c6c39014738a54a68dfa6.tar.gz linux-183182235f6d53bac62c6c39014738a54a68dfa6.zip | |
drm/amd/display: Wrap DCN32 phantom-plane allocation in DC_RUN_WITH_PREEMPTION_ENABLED
[Why]
dcn32_validate_bandwidth() wraps dcn32_internal_validate_bw() with
DC_FP_START()/DC_FP_END(). In x86 non-RT, DC_FP_START takes fpregs_lock(),
which disables local softirqs.
The DML1 path through dcn32_enable_phantom_plane() calls kvzalloc() to
allocate ~335 KiB for dc_plane_state. This triggers the vmalloc path,
which calls BUG_ON(in_interrupt()) because it's invoked within the
FPU-enabled (softirq disabled) region, leading to a kernel crash.
[How]
Wrap the dc_state_create_phantom_plane() call with the
DC_RUN_WITH_PREEMPTION_ENABLED() macro to allow preemption during
this memory allocation.
Fixes: 235c67634230 ("drm/amd/display: add DCN32/321 specific files for Display Core")
Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/4470
Reviewed-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Signed-off-by: James Lin <pinglei.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 885ccbef7b94a8b38f69c4211c679021aa27ad11)
Cc: stable@vger.kernel.org
Diffstat (limited to 'tools/perf/scripts/python/exported-sql-viewer.py')
0 files changed, 0 insertions, 0 deletions