On Thu, Sep 03, 2026 at 03:34:31PM -0500, Bjorn Helgaas wrote: > On Tue, Aug 25, 2026 at 09:28:01AM +0300, Leon Romanovsky wrote: > > From: Leon Romanovsky <[email protected]> > > > > 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 <[email protected]> > > Acked-by: Bjorn Helgaas <[email protected]> > > 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.
This PCI patch is completely standalone, so I sent it separately: https://lore.kernel.org/all/[email protected]/ Can you please take it from there? Thanks > > > --- > > 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 > >
