drm/gpusvm: Add devmem callback to get_pages

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Add an optional drm_gpusvm_ctx.devmem_fn, invoked for each device-memory
allocation backing the range's faulted pages. It runs under the notifier
lock and independently of the DMA map, so it also fires with no_dma_map.
Adjacent pages of one allocation are coalesced, so the callback must be
idempotent.

v2
Reset last to NULL for non-devmem pages(Sashiko/Matt)

v3
Run drm_gpusvm_pages_valid_unlocked() on the map_dma path even when
devmem_fn is set, so an invalidated range's stale inline mapping is
reset.

Suggested-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patch.msgid.link/20261001033602.3166274-8-himal.prasad.ghimiray@intel.com
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

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Himal Prasad Ghimiray 2026-10-01 09:06:05 +05:30 • committed by Rodrigo Vivi

parent 2069eeb76a

commit 927a6ab619

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2 changed files with 86 additions and 25 deletions

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105

drivers/gpu/drm/drm_gpusvm.c

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6

include/drm/drm_gpusvm.h

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