RDMA/umem: Introduce an option to revoke DMABUF umem

Introduce an option to revoke DMABUF umem. This option will retain the umem allocation while revoking its DMA mapping. Furthermore, any subsequent attempts to map the pages should fail once the umem has been revoked. This functionality will be utilized in the upcoming patches in the series, where we aim to delay umem deallocation until the mkey deregistration. However, we must unmap its pages immediately. Signed-off-by: Yishai Hadas <[email protected]> Link: https://patch.msgid.link/a38270f2fe4a194868ca2312f4c1c760e51bcbff.1722512548.git.leon@kernel.org Signed-off-by: Leon Romanovsky <[email protected]> (cherry-picked from commit 253c61d linux) Signed-off-by: Tushar Dave <[email protected]> Acked-by: Matthew R. Ochs <[email protected]> Acked-by: Jamie Nguyen <[email protected]> Acked-by: Carol L Soto <[email protected]> Signed-off-by: Matthew R. Ochs <[email protected]>
NVIDIA · Oct 18, 2024 · 53b8e2c · 53b8e2c
1 parent 4524efd
commit 53b8e2c
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Showing 2 changed files with 22 additions and 2 deletions.
diff --git a/drivers/infiniband/core/umem_dmabuf.c b/drivers/infiniband/core/umem_dmabuf.c
@@ -23,6 +23,9 @@ int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf)
 
 	dma_resv_assert_held(umem_dmabuf->attach->dmabuf->resv);
 
+	if (umem_dmabuf->revoked)
+		return -EINVAL;
+
 	if (umem_dmabuf->sgt)
 		goto wait_fence;
 
@@ -242,15 +245,29 @@ struct ib_umem_dmabuf *ib_umem_dmabuf_get_pinned(struct ib_device *device,
 }
 EXPORT_SYMBOL(ib_umem_dmabuf_get_pinned);
 
-void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf)
+void ib_umem_dmabuf_revoke(struct ib_umem_dmabuf *umem_dmabuf)
 {
 	struct dma_buf *dmabuf = umem_dmabuf->attach->dmabuf;
 
 	dma_resv_lock(dmabuf->resv, NULL);
+	if (umem_dmabuf->revoked)
+		goto end;
 	ib_umem_dmabuf_unmap_pages(umem_dmabuf);
-	if (umem_dmabuf->pinned)
+	if (umem_dmabuf->pinned) {
 		dma_buf_unpin(umem_dmabuf->attach);
+		umem_dmabuf->pinned = 0;
+	}
+	umem_dmabuf->revoked = 1;
+end:
 	dma_resv_unlock(dmabuf->resv);
+}
+EXPORT_SYMBOL(ib_umem_dmabuf_revoke);
+
+void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf)
+{
+	struct dma_buf *dmabuf = umem_dmabuf->attach->dmabuf;
+
+	ib_umem_dmabuf_revoke(umem_dmabuf);
 
 	dma_buf_detach(dmabuf, umem_dmabuf->attach);
 	dma_buf_put(dmabuf);

diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
@@ -38,6 +38,7 @@ struct ib_umem_dmabuf {
 	unsigned long last_sg_trim;
 	void *private;
 	u8 pinned : 1;
+	u8 revoked : 1;
 };
 
 static inline struct ib_umem_dmabuf *to_ib_umem_dmabuf(struct ib_umem *umem)
@@ -158,6 +159,7 @@ ib_umem_dmabuf_get_pinned_with_dma_device(struct ib_device *device,
 int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf);
 void ib_umem_dmabuf_unmap_pages(struct ib_umem_dmabuf *umem_dmabuf);
 void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf);
+void ib_umem_dmabuf_revoke(struct ib_umem_dmabuf *umem_dmabuf);
 
 #else /* CONFIG_INFINIBAND_USER_MEM */
 
@@ -217,6 +219,7 @@ static inline int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf)
 }
 static inline void ib_umem_dmabuf_unmap_pages(struct ib_umem_dmabuf *umem_dmabuf) { }
 static inline void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf) { }
+static inline void ib_umem_dmabuf_revoke(struct ib_umem_dmabuf *umem_dmabuf) {}
 
 #endif /* CONFIG_INFINIBAND_USER_MEM */
 #endif /* IB_UMEM_H */