On Tue, Aug 25, 2026 at 09:28:01AM +0300, Leon Romanovsky wrote:
From: Leon Romanovsky leonro@nvidia.com
Commit 95308225e5ba ("dma-buf: Rename dma_buf_move_notify() to dma_buf_invalidate_mappings()") left the DMABUF section of the P2PDMA documentation pointing at move_notify(), a symbol that no longer exists. Readers grepping for it find nothing, and this is the only place in Documentation/ describing the revocation requirement.
Name the current function and record that importers which cannot unmap within bounded time have to be rejected at attach time, which is what makes the synchronous unmap on remove() achievable.
Fixes: 95308225e5ba ("dma-buf: Rename dma_buf_move_notify() to dma_buf_invalidate_mappings()") Signed-off-by: Leon Romanovsky leonro@nvidia.com
Acked-by: Bjorn Helgaas bhelgaas@google.com
It looks like 2/2 might be updated, and it probably makes sense to merge them both together, but let me know if you want me to take this.
Documentation/driver-api/pci/p2pdma.rst | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/Documentation/driver-api/pci/p2pdma.rst b/Documentation/driver-api/pci/p2pdma.rst index d3f406cca694..63cff9e4d2c9 100644 --- a/Documentation/driver-api/pci/p2pdma.rst +++ b/Documentation/driver-api/pci/p2pdma.rst @@ -167,9 +167,11 @@ In this case the initiator and target pci_devices are known and the P2P subsyste is used to determine the mapping type. The phys_addr_t-based DMA API is used to establish the dma_addr_t. -Lifecycle is controlled by DMABUF move_notify(). When the exporting driver wants +Lifecycle is controlled by DMABUF revocation. When the exporting driver wants to remove() it must deliver an invalidation shutdown to all DMABUF importing -drivers through move_notify() and synchronously DMA unmap all the MMIO. +drivers through dma_buf_invalidate_mappings() and synchronously DMA unmap all +the MMIO. Importers unable to complete that unmap within bounded time have to +be rejected when they attach, which dma_buf_attach_revocable() checks for. No importing driver can continue to have a DMA map to the MMIO after the exporting driver has destroyed its p2p_provider.
-- 2.55.0