diff options
| author | Leon Romanovsky <leonro@nvidia.com> | 2026-01-31 08:34:18 +0300 |
|---|---|---|
| committer | Christian König <christian.koenig@amd.com> | 2026-02-23 21:51:41 +0300 |
| commit | 8c5f9645c3893f0db679d9affe4fe4e665b990dd (patch) | |
| tree | 559864b5593de3697db87bd902482827b9255544 | |
| parent | 6ffe939bf94fbbeaaa4050a0e9c22820e959b15f (diff) | |
| download | linux-8c5f9645c3893f0db679d9affe4fe4e665b990dd.tar.xz | |
iommufd: Add dma_buf_pin()
IOMMUFD relies on a private protocol with VFIO, and this always operated
in pinned mode.
Now that VFIO can support pinned importers update IOMMUFD to invoke the
normal dma-buf flow to request pin.
This isn't enough to allow IOMMUFD to work with other exporters, it still
needs a way to get the physical address list which is another series.
IOMMUFD supports the defined revoke semantics. It immediately stops and
fences access to the memory inside it's invalidate_mappings() callback,
and it currently doesn't use scatterlists so doesn't call map/unmap at
all.
It is expected that a future revision can synchronously call unmap from
the move_notify callback as well.
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://lore.kernel.org/r/20260131-dmabuf-revoke-v7-8-463d956bd527@nvidia.com
| -rw-r--r-- | drivers/iommu/iommufd/pages.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/iommu/iommufd/pages.c b/drivers/iommu/iommufd/pages.c index 1d41ac625c98..8124c554f2cc 100644 --- a/drivers/iommu/iommufd/pages.c +++ b/drivers/iommu/iommufd/pages.c @@ -1502,16 +1502,22 @@ static int iopt_map_dmabuf(struct iommufd_ctx *ictx, struct iopt_pages *pages, mutex_unlock(&pages->mutex); } - rc = sym_vfio_pci_dma_buf_iommufd_map(attach, &pages->dmabuf.phys); + rc = dma_buf_pin(attach); if (rc) goto err_detach; + rc = sym_vfio_pci_dma_buf_iommufd_map(attach, &pages->dmabuf.phys); + if (rc) + goto err_unpin; + dma_resv_unlock(dmabuf->resv); /* On success iopt_release_pages() will detach and put the dmabuf. */ pages->dmabuf.attach = attach; return 0; +err_unpin: + dma_buf_unpin(attach); err_detach: dma_resv_unlock(dmabuf->resv); dma_buf_detach(dmabuf, attach); @@ -1657,6 +1663,7 @@ void iopt_release_pages(struct kref *kref) if (iopt_is_dmabuf(pages) && pages->dmabuf.attach) { struct dma_buf *dmabuf = pages->dmabuf.attach->dmabuf; + dma_buf_unpin(pages->dmabuf.attach); dma_buf_detach(dmabuf, pages->dmabuf.attach); dma_buf_put(dmabuf); WARN_ON(!list_empty(&pages->dmabuf.tracker)); |