Differential D49625

LinuxKPI: Implement dma_map_resource/dma_unmap_resource functions
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Authored by bz on Apr 1 2025, 3:03 PM.

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rG106294d5801f: LinuxKPI: Implement dma_map_resource/dma_unmap_resource functions
rGa02180cf60a6: LinuxKPI: Implement dma_map_resource/dma_unmap_resource functions

Summary

dma_map_resource() and dma_unmap_resource() functions are used to map
and unmap of memory-mapped IO resources so they can be accessed by
the device.

Required by drm-kmod v5.5 to be built.

While for drm-kmod 6.6-lts only amdgpu uses these in one place and
the code apparently has not been exercised a lot it has been around
like this for years. With changing the underlying implementations
bring it into the tree; should we find errors with it they can also
be fixed here.

Obtained from: D30933 (by wulf)
Sponsored by: The FreeBSD Foundation
MFC after: 3 days

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rG FreeBSD src repository

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Event Timeline

bz created this revision.Apr 1 2025, 3:03 PM

Herald added subscribers: emaste, imp. · View Herald TranscriptApr 1 2025, 3:03 PM

bz requested review of this revision.Apr 1 2025, 3:03 PM

bz mentioned this in D30933: LinuxKPI: Implement dma_map_resource/dma_unmap_resource functions..Apr 1 2025, 3:04 PM

Harbormaster completed remote builds in B63268: Diff 152989.Apr 1 2025, 3:04 PM

bz added a parent revision: D45294: LinuxKPI: add missing bus_dmamap_sync() calls or exclude them.Apr 1 2025, 3:04 PM

dumbbell accepted this revision.Apr 1 2025, 3:56 PM

This revision is now accepted and ready to land.Apr 1 2025, 3:56 PM

I'll bump __FreeBSD_version when this all goes in so drm-kmod can track it.

bz mentioned this in D45294: LinuxKPI: add missing bus_dmamap_sync() calls or exclude them.Apr 12 2025, 5:34 PM

Closed by commit rGa02180cf60a6: LinuxKPI: Implement dma_map_resource/dma_unmap_resource functions (authored by bz). · Explain WhyJun 3 2025, 6:38 PM

This revision was automatically updated to reflect the committed changes.

bz added a commit: rGa02180cf60a6: LinuxKPI: Implement dma_map_resource/dma_unmap_resource functions.

bz added a commit: rG106294d5801f: LinuxKPI: Implement dma_map_resource/dma_unmap_resource functions.Jul 13 2025, 7:31 PM

Revision Contents
Changeset List

Path

Size

4 lines

sys/

compat/

linuxkpi/

common/

include/

linux/

14 lines

sys/

2 lines

Diff 156485

UPDATING

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sys/compat/linuxkpi/common/include/linux/dma-mapping.h

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sys/sys/param.h

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