kernel/git/next/linux-next.git/drivers/gpu/Makefile, branch master

gpu: drm: nova: depend on nova-core and use its symbols

2026-06-29T09:28:39+00:00

Make nova-core a build dependency of nova-drm, so its crate metadata is available and up-to-date when the latter is built. This is intended to be a workaround until the build system supports Rust cross-crate dependencies natively. Signed-off-by: Alexandre Courbot Link: https://patch.msgid.link/20260622-nova-exports-v5-4-6191773fc977@nvidia.com Signed-off-by: Danilo Krummrich

gpu: nova-core: emit Rust metadata for nova-drm

2026-06-29T09:28:38+00:00

Emit nova-core's crate metadata (libnova_core.rmeta) so that nova-drm can import nova-core's types and functions at compile time. This is intended to be a workaround until the build system supports Rust cross-crate dependencies natively. Signed-off-by: Alexandre Courbot Link: https://patch.msgid.link/20260622-nova-exports-v5-3-6191773fc977@nvidia.com Signed-off-by: Danilo Krummrich

gpu: nova-core: export Rust symbols for nova-drm

2026-06-29T09:28:38+00:00

Export nova-core's Rust symbols so nova-drm can resolve references to it when loaded as a module. This is done by generating declarations and EXPORT_SYMBOL_RUST_GPL() calls for Rust symbols referenced by nova-drm, and compiling them into the module as `nova_core_exports.o`. `nova_core_exports.o` declares every Rust symbol as `extern int`. Running `gendwarfksyms` on it would compute CRCs from those placeholder types instead of the real Rust ones, so make MODVERSIONS use this shim only for the export list, and derive CRCs from `nova_core.o`. This patch is intended to be a workaround until the build system supports Rust cross-crate dependencies natively. Signed-off-by: Alexandre Courbot Link: https://patch.msgid.link/20260622-nova-exports-v5-2-6191773fc977@nvidia.com Signed-off-by: Danilo Krummrich

gpu: build nova-core and nova-drm from drivers/gpu/Makefile

2026-06-29T09:28:38+00:00

A dependency between nova-core and nova-drm is about to be introduced, which requires nova-core to be built first. As this is not easily doable from separate directories, move both build targets to the first common parent, `drivers/gpu/Makefile`. Suggested-by: Miguel Ojeda Signed-off-by: Alexandre Courbot Link: https://patch.msgid.link/20260622-nova-exports-v5-1-6191773fc977@nvidia.com Signed-off-by: Danilo Krummrich

gpu: Fix uninitialized buddy for built-in drivers

2026-02-24T03:40:59+00:00

Move buddy to the start of the link order, so its __init runs before any other built-in drivers that may depend on it. Otherwise, a built-in driver that tries to use the buddy allocator will run into a kernel NULL pointer dereference because slab_blocks is uninitialized. Specifically, this fixes drm/xe (as built-in) running into a kernel panic during boot, because it uses buddy during device probe. Fixes: ba110db8e1bc ("gpu: Move DRM buddy allocator one level up (part two)") Cc: Joel Fernandes Cc: Dave Airlie Cc: intel-xe@lists.freedesktop.org Reviewed-by: Dave Airlie Tested-by: Peter Senna Tschudin Signed-off-by: Koen Koning Signed-off-by: Dave Airlie Link: https://patch.msgid.link/20260213152047.179628-1-koen.koning@linux.intel.com

gpu: Move DRM buddy allocator one level up (part two)

2026-02-06T01:38:35+00:00

Move the DRM buddy allocator one level up so that it can be used by GPU drivers (example, nova-core) that have usecases other than DRM (such as VFIO vGPU support). Modify the API, structures and Kconfigs to use "gpu_buddy" terminology. Adapt the drivers and tests to use the new API. The commit cannot be split due to bisectability, however no functional change is intended. Verified by running K-UNIT tests and build tested various configurations. Signed-off-by: Joel Fernandes Reviewed-by: Dave Airlie [airlied: I've split this into two so git can find copies easier. I've also just nuked drm_random library, that stuff needs to be done elsewhere and only the buddy tests seem to be using it]. Signed-off-by: Dave Airlie

gpu: Move DRM buddy allocator one level up (part one)

2026-02-06T01:34:02+00:00

gpu: nova-core: add initial driver stub

2025-03-09T18:24:27+00:00

Add the initial nova-core driver stub. nova-core is intended to serve as a common base for nova-drm (the corresponding DRM driver) and the vGPU manager VFIO driver, serving as a hard- and firmware abstraction layer for GSP-based NVIDIA GPUs. The Nova project, including nova-core and nova-drm, in the long term, is intended to serve as the successor of Nouveau for all GSP-based GPUs. The motivation for both, starting a successor project for Nouveau and doing so using the Rust programming language, is documented in detail through a previous post on the mailing list [1], an LWN article [2] and a talk from LPC '24. In order to avoid the chicken and egg problem to require a user to upstream Rust abstractions, but at the same time require the Rust abstractions to implement the driver, nova-core kicks off as a driver stub and is subsequently developed upstream. Link: https://lore.kernel.org/dri-devel/Zfsj0_tb-0-tNrJy@cassiopeiae/T/#u [1] Link: https://lwn.net/Articles/990736/ [2] Link: https://youtu.be/3Igmx28B3BQ?si=sBdSEer4tAPKGpOs [3] Reviewed-by: Alexandre Courbot Link: https://lore.kernel.org/r/20250306222336.23482-5-dakr@kernel.org Signed-off-by: Danilo Krummrich

gpu: host1x: Add context bus

2022-06-01T09:50:42+00:00

The context bus is a "dummy" bus that contains struct devices that correspond to IOMMU contexts assigned through Host1x to processes. Even when host1x itself is built as a module, the bus is registered in built-in code so that the built-in ARM SMMU driver is able to reference it. Signed-off-by: Mikko Perttunen Signed-off-by: Thierry Reding

gpu/trace: add a gpu total memory usage tracepoint

2020-03-03T22:52:41+00:00

This change adds the below gpu memory tracepoint: gpu_mem/gpu_mem_total: track global or proc gpu memory total usages Per process tracking of total gpu memory usage in the gem layer is not appropriate and hard to implement with trivial overhead. So for the gfx device driver layer to track total gpu memory usage both globally and per process in an easy and uniform way is to integrate the tracepoint in this patch to the underlying varied implementations of gpu memory tracking system from vendors. Putting this tracepoint in the common trace events can not only help wean the gfx drivers off of debugfs but also greatly help the downstream Android gpu vendors because debugfs is to be deprecated in the upcoming Android release. Then the gpu memory tracking of both Android kernel and the upstream linux kernel can stay closely, which can benefit the whole kernel eco-system in the long term. Link: http://lkml.kernel.org/r/20200302235044.59163-1-zzyiwei@google.com Acked-by: Greg Kroah-Hartman Signed-off-by: Yiwei Zhang Signed-off-by: Steven Rostedt (VMware)