LinuxKPI: Implement dma_map_resource/dma_unmap_resource functions.
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Authored by wulf on Jun 28 2021, 8:53 PM.

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Reviewers

• hselasky
manu
dumbbell

Group Reviewers

linuxkpi

Summary

dma_map_resource and dma_unmap_resource functions are API for mapping
and unmapping of memory-mapped IO resources so they can be accessed by
the device.

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

Test Plan

This naive implementation is completely untested as drm-kmod v5.5 uses
these functions only for testing purposes yet.

Diff Detail

Repository

rS FreeBSD src repository - subversion

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Build Status

Buildable 40150
Build 37039: arc lint + arc unit

Event Timeline

wulf created this revision.Jun 28 2021, 8:53 PM

Herald added subscribers: linuxkpi, emaste, imp. · View Herald TranscriptJun 28 2021, 8:53 PM

wulf requested review of this revision.Jun 28 2021, 8:53 PM

Harbormaster completed remote builds in B40150: Diff 91460.Jun 28 2021, 8:53 PM

Depending on the outcome in D30932 ulong vs. uintptr_t here too.

drm-kmod is a better place to stay until these routines get tested

I came across this as I touched the linux_* versions and found them directly being called from drm-kmod lkpi code. It's been two years. Can we move such code into base please?

bz mentioned this in D45294: LinuxKPI: add missing bus_dmamap_sync() calls or exclude them.Mar 29 2025, 9:23 PM

That’s fine with me. Would you like to submit the patch for review or should I do it?

EDIT: I see D45294 now. Should it be part of it?

bz mentioned this in D49625: LinuxKPI: Implement dma_map_resource/dma_unmap_resource functions.Apr 1 2025, 3:03 PM

In D30933#1130321, @dumbbell wrote:

That’s fine with me. Would you like to submit the patch for review or should I do it?

EDIT: I see D45294 now. Should it be part of it?

I opened D49625 for it.