From: Dave Airlie <airlied@gmail.com>
To: dri-devel@lists.freedesktop.org
Cc: nouveau@lists.freedesktop.org
Subject: nouveau/vmm: fix switching between small and large PTEs
Date: Tue, 3 Feb 2026 15:25:24 +1000 [thread overview]
Message-ID: <20260203052823.2220053-1-airlied@gmail.com> (raw)
The nouveau page table has dual page tables with special states for
tracking small vs large pages at the bottom level. However the current
code isn't designed with the higher level large page support in mind.
The nouveau_uvmm/gpuvm code can cause unrefs to get delayed, so things
like ref SPT, map SPT, unmap SPT, ref LPT, map LPT, unref SPT can happen.
unrefs can end up quite delayed and it shouldn't matter as unref should
just affect reference counts.
However at least the SPT unref path was overwriting the LPT value when
all SPT were unreffed even if an LPT was referenced in between.
This series refactors the code to use a union, then increases the size
as I think even with the current code there was enough ref counts for SPTE.
The last patch adds LPTE tracking.
Dave.
next reply other threads:[~2026-02-03 5:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-03 5:25 Dave Airlie [this message]
2026-02-03 5:25 ` [PATCH 1/3] nouveau/vmm: rewrite pte tracker using a struct and bitfields Dave Airlie
2026-02-03 5:25 ` [PATCH 2/3] nouveau/vmm: increase size of vmm pte tracker struct to u32 Dave Airlie
2026-02-03 5:25 ` [PATCH 3/3] nouveau/vmm: start tracking if the LPT PTE is valid. (v6) Dave Airlie
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