From: Joel Fernandes <joelagnelf@nvidia.com>
To: John Hubbard <jhubbard@nvidia.com>
Cc: Danilo Krummrich <dakr@kernel.org>, Zhi Wang <zhiw@nvidia.com>,
linux-kernel@vger.kernel.org,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>, Simona Vetter <simona@ffwll.ch>,
Jonathan Corbet <corbet@lwn.net>,
Alex Deucher <alexander.deucher@amd.com>,
Christian Koenig <christian.koenig@amd.com>,
Jani Nikula <jani.nikula@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
Tvrtko Ursulin <tursulin@ursulin.net>,
Rui Huang <ray.huang@amd.com>,
Matthew Auld <matthew.auld@intel.com>,
Matthew Brost <matthew.brost@intel.com>,
Lucas De Marchi <lucas.demarchi@intel.com>,
Thomas Hellstrom <thomas.hellstrom@linux.intel.com>,
Helge Deller <deller@gmx.de>, Alice Ryhl <aliceryhl@google.com>,
Miguel Ojeda <ojeda@kernel.org>,
Alex Gaynor <alex.gaynor@gmail.com>,
Boqun Feng <boqun.feng@gmail.com>, Gary Guo <gary@garyguo.net>,
Bjorn Roy Baron <bjorn3_gh@protonmail.com>,
Benno Lossin <lossin@kernel.org>,
Andreas Hindborg <a.hindborg@kernel.org>,
Trevor Gross <tmgross@umich.edu>,
Alistair Popple <apopple@nvidia.com>,
Timur Tabi <ttabi@nvidia.com>, Edwin Peer <epeer@nvidia.com>,
Alexandre Courbot <acourbot@nvidia.com>,
Andrea Righi <arighi@nvidia.com>,
Andy Ritger <aritger@nvidia.com>,
Alexey Ivanov <alexeyi@nvidia.com>,
Balbir Singh <balbirs@nvidia.com>,
Philipp Stanner <phasta@kernel.org>,
Elle Rhumsaa <elle@weathered-steel.dev>,
Daniel Almeida <daniel.almeida@collabora.com>,
nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
rust-for-linux@vger.kernel.org, linux-doc@vger.kernel.org,
amd-gfx@lists.freedesktop.org, intel-gfx@lists.freedesktop.org,
intel-xe@lists.freedesktop.org, linux-fbdev@vger.kernel.org
Subject: Re: [PATCH RFC v6 05/26] nova-core: mm: Add support to use PRAMIN windows to write to VRAM
Date: Thu, 29 Jan 2026 20:59:01 -0500 [thread overview]
Message-ID: <20260130015901.GA301119@joelbox2> (raw)
In-Reply-To: <97af2d85-a905-44d4-951f-e56a40f4312e@nvidia.com>
On 1/29/26 8:12 PM, John Hubbard wrote:
> On 1/29/26 4:26 PM, Joel Fernandes wrote:
>> Based on the below discussion and research, I came up with some deadlock
>> scenarios that we need to handle in the v6 series of these patches.
>> [...]
>> memory allocations under locks that we need in the dma-fence signaling
>> critical path (when doing the virtual memory map/unmap)
>
> unmap? Are you seeing any allocations happening during unmap? I don't
> immediately see any, but that sounds surprising.
Not allocations but we are acquiring locks during unmap. My understanding
is (at least some) unmaps have to also be done in the dma fence signaling
critical path (the run stage), but Danilo/you can correct me if I am wrong
on that. We cannot avoid all locking but those same locks cannot be held in
any other paths which do a memory allocation (as mentioned in one of the
deadlock scenarios), that is probably the main thing to check for unmap.
Thanks,
--
Joel Fernandes
next prev parent reply other threads:[~2026-01-30 1:59 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-20 20:42 [PATCH RFC v6 00/26] nova-core: Memory management infrastructure (v6) Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 01/26] rust: clist: Add support to interface with C linked lists Joel Fernandes
2026-01-20 23:48 ` Gary Guo
2026-01-21 19:50 ` Joel Fernandes
2026-01-21 20:36 ` Gary Guo
2026-01-21 20:41 ` Joel Fernandes
2026-01-21 20:46 ` Joel Fernandes
2026-01-25 1:51 ` Joel Fernandes
2026-01-21 7:27 ` Zhi Wang
2026-01-21 18:12 ` Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 02/26] gpu: Move DRM buddy allocator one level up Joel Fernandes
2026-02-05 20:55 ` Dave Airlie
2026-02-06 1:04 ` Joel Fernandes
2026-02-06 1:07 ` Dave Airlie
2026-01-20 20:42 ` [PATCH RFC v6 03/26] rust: gpu: Add GPU buddy allocator bindings Joel Fernandes
2026-02-04 3:55 ` Dave Airlie
2026-02-05 1:00 ` Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 04/26] nova-core: mm: Select GPU_BUDDY for VRAM allocation Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 05/26] nova-core: mm: Add support to use PRAMIN windows to write to VRAM Joel Fernandes
2026-01-21 8:07 ` Zhi Wang
2026-01-21 17:52 ` Joel Fernandes
2026-01-22 23:16 ` Joel Fernandes
2026-01-23 10:13 ` Zhi Wang
2026-01-23 12:59 ` Joel Fernandes
2026-01-28 12:04 ` Danilo Krummrich
2026-01-28 15:27 ` Joel Fernandes
2026-01-29 0:09 ` Danilo Krummrich
2026-01-29 1:02 ` John Hubbard
2026-01-29 1:49 ` Joel Fernandes
2026-01-29 1:28 ` Joel Fernandes
2026-01-30 0:26 ` Joel Fernandes
2026-01-30 1:11 ` John Hubbard
2026-01-30 1:59 ` Joel Fernandes [this message]
2026-01-30 3:38 ` John Hubbard
2026-01-30 21:14 ` Joel Fernandes
2026-01-31 3:00 ` Dave Airlie
2026-01-31 3:21 ` John Hubbard
2026-01-31 20:08 ` Joel Fernandes
2026-01-31 20:02 ` Joel Fernandes
2026-02-02 9:12 ` Christian König
2026-02-04 23:42 ` Joel Fernandes
2026-01-30 1:16 ` Gary Guo
2026-01-30 1:45 ` Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 06/26] docs: gpu: nova-core: Document the PRAMIN aperture mechanism Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 07/26] nova-core: Add BAR1 aperture type and size constant Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 08/26] nova-core: gsp: Add BAR1 PDE base accessors Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 09/26] nova-core: mm: Add common memory management types Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 10/26] nova-core: mm: Add common types for all page table formats Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 11/26] nova-core: mm: Add MMU v2 page table types Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 12/26] nova-core: mm: Add MMU v3 " Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 13/26] nova-core: mm: Add unified page table entry wrapper enums Joel Fernandes
2026-01-21 9:54 ` Zhi Wang
2026-01-21 18:35 ` Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 14/26] nova-core: mm: Add TLB flush support Joel Fernandes
2026-01-21 9:59 ` Zhi Wang
2026-01-21 18:45 ` Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 15/26] nova-core: mm: Add GpuMm centralized memory manager Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 16/26] nova-core: mm: Add page table walker for MMU v2 Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 17/26] nova-core: mm: Add Virtual Memory Manager Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 18/26] nova-core: mm: Add virtual address range tracking to VMM Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 19/26] nova-core: mm: Add BAR1 user interface Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 20/26] nova-core: gsp: Return GspStaticInfo and FbLayout from boot() Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 21/26] nova-core: mm: Add memory management self-tests Joel Fernandes
2026-01-20 20:42 ` [PATCH RFC v6 22/26] nova-core: mm: Add PRAMIN aperture self-tests Joel Fernandes
2026-01-20 20:43 ` [PATCH RFC v6 23/26] nova-core: gsp: Extract usable FB region from GSP Joel Fernandes
2026-01-20 20:43 ` [PATCH RFC v6 24/26] nova-core: fb: Add usable_vram field to FbLayout Joel Fernandes
2026-01-20 20:43 ` [PATCH RFC v6 25/26] nova-core: mm: Use usable VRAM region for buddy allocator Joel Fernandes
2026-01-20 20:43 ` [PATCH RFC v6 26/26] nova-core: mm: Add BarUser to struct Gpu and create at boot Joel Fernandes
2026-01-28 11:37 ` [PATCH RFC v6 00/26] nova-core: Memory management infrastructure (v6) Danilo Krummrich
2026-01-28 12:44 ` Joel Fernandes
2026-01-29 0:01 ` Danilo Krummrich
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