From: "Danilo Krummrich" <dakr@kernel.org>
To: "Joel Fernandes" <joelagnelf@nvidia.com>
Cc: "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>,
"Huang Rui" <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>,
"John Hubbard" <jhubbard@nvidia.com>,
"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>,
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<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 01:09:21 +0100 [thread overview]
Message-ID: <DG0MXC1R8IRS.Y5X6XDUBOGR5@kernel.org> (raw)
In-Reply-To: <c0a3ac65-e2e5-4b62-bc75-49b1599e160f@nvidia.com>
On Wed Jan 28, 2026 at 4:27 PM CET, Joel Fernandes wrote:
> I will go over these concerns, just to clarify - do you mean forbidding
> *any* lock or do you mean only forbidding non-atomic locks? I believe we
> can avoid non-atomic locks completely - actually I just wrote a patch
> before I read this email to do just. If we are to forbid any locking at
> all, that might require some careful redesign to handle the above race
> afaics.
It's not about the locks themselves, sleeping locks are fine too. It's about
holding locks that are held elsewhere when doing memory allocations that can
call back into MMU notifiers or the shrinker.
I.e. if in the fence signalling critical path you wait for a mutex that is held
elsewhere while allocating memory and the memory allocation calls back into the
shrinker, you may end up waiting for your own DMA fence to be signaled, which
causes a deadlock.
next prev parent reply other threads:[~2026-01-29 0:09 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 [this message]
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
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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