bpf: Add dmabuf iterator

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The dmabuf iterator traverses the list of all DMA buffers.

DMA buffers are refcounted through their associated struct file. A
reference is taken on each buffer as the list is iterated to ensure each
buffer persists for the duration of the bpf program execution without
holding the list mutex.

Signed-off-by: T.J. Mercier <tjmercier@google.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/r/20250522230429.941193-3-tjmercier@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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T.J. Mercier 2025-05-22 23:04:26 +00:00 • committed by Alexei Starovoitov

parent 89f9dba365

commit 76ea955349

4 changed files with 175 additions and 0 deletions

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68

drivers/dma-buf/dma-buf.c

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2

include/linux/dma-buf.h

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3

kernel/bpf/Makefile

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102

kernel/bpf/dmabuf_iter.c

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