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Alice Ryhl
da939ef4c4
Patch series "Add Rust abstraction for Maple Trees", v3. This will be used in the Tyr driver [1] to allocate from the GPU's VA space that is not owned by userspace, but by the kernel, for kernel GPU mappings. Danilo tells me that in nouveau, the maple tree is used for keeping track of "VM regions" on top of GPUVM, and that he will most likely end up doing the same in the Rust Nova driver as well. These abstractions intentionally do not expose any way to make use of external locking. You are required to use the internal spinlock. For now, we do not support loads that only utilize rcu for protection. This contains some parts taken from Andrew Ballance's RFC [2] from April. However, it has also been reworked significantly compared to that RFC taking the use-cases in Tyr into account. This patch (of 3): The maple tree will be used in the Tyr driver to allocate and keep track of GPU allocations created internally (i.e. not by userspace). It will likely also be used in the Nova driver eventually. This adds the simplest methods for additional and removal that do not require any special care with respect to concurrency. This implementation is based on the RFC by Andrew but with significant changes to simplify the implementation. [[email protected]: fix intra-doc links] Link: https://lkml.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/[email protected] Link: https://lkml.kernel.org/r/[email protected] Link: https://lore.kernel.org/r/[email protected] [1] Link: https://lore.kernel.org/r/[email protected] [2] Co-developed-by: Andrew Ballance <[email protected]> Signed-off-by: Andrew Ballance <[email protected]> Signed-off-by: Alice Ryhl <[email protected]> Reviewed-by: Danilo Krummrich <[email protected]> Cc: Andreas Hindborg <[email protected]> Cc: Björn Roy Baron <[email protected]> Cc: Boqun Feng <[email protected]> Cc: Daniel Almeida <[email protected]> Cc: Gary Guo <[email protected]> Cc: Liam Howlett <[email protected]> Cc: Lorenzo Stoakes <[email protected]> Cc: Miguel Ojeda <[email protected]> Cc: Trevor Gross <[email protected]> Signed-off-by: Andrew Morton <[email protected]>