drm/gpusvm: extract drm_gpusvm_dma_map_pages() helper

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Move the per-device DMA mapping loop of drm_gpusvm_get_pages() into a
helper drm_gpusvm_dma_map_pages(). The mapping logic is only moved, not
changed, so there is no functional change.

The helper maps the already-faulted pfns into one drm_gpusvm_pages
instance under the notifier lock and unwinds its own partial mapping on
error. The HMM fault and the notifier retry loop stay in get_pages()
common code rather than being pushed down to drivers, so no driver has
to reimplement the subtle fault and retry logic.

With the mapping isolated per instance, get_pages() can later fault once
and DMA map an array of drm_gpusvm_pages plus a count, one per owning
drm_device.

Suggested-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Honglei Huang <honghuan@amd.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20260905133142.3628027-3-honghuan@amd.com

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Honglei Huang 2026-09-05 21:31:38 +08:00 • committed by Matthew Brost

parent ca76137442

commit 1ae616edb6

1 changed files with 129 additions and 96 deletions

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drivers/gpu/drm/drm_gpusvm.c

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