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authorJianxin Xiong <jianxin.xiong@intel.com>2020-12-16 00:27:13 +0300
committerJason Gunthorpe <jgg@nvidia.com>2021-01-20 23:07:52 +0300
commit368c0159d492d7fbdb5791b40c9263ec4e97a10f (patch)
treecd16d9c4358935b05f317e4e2ed096d3e61e74f9 /include/rdma
parentabfa456555f4c2bde191cf12064168a05a2865a1 (diff)
downloadlinux-368c0159d492d7fbdb5791b40c9263ec4e97a10f.tar.xz
RDMA/umem: Support importing dma-buf as user memory region
Dma-buf is a standard cross-driver buffer sharing mechanism that can be used to support peer-to-peer access from RDMA devices. Device memory exported via dma-buf is associated with a file descriptor. This is passed to the user space as a property associated with the buffer allocation. When the buffer is registered as a memory region, the file descriptor is passed to the RDMA driver along with other parameters. Implement the common code for importing dma-buf object and mapping dma-buf pages. Link: https://lore.kernel.org/r/1608067636-98073-2-git-send-email-jianxin.xiong@intel.com Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com> Reviewed-by: Sean Hefty <sean.hefty@intel.com> Acked-by: Michael J. Ruhl <michael.j.ruhl@intel.com> Acked-by: Christian Koenig <christian.koenig@amd.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'include/rdma')
-rw-r--r--include/rdma/ib_umem.h48
1 files changed, 45 insertions, 3 deletions
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
index 7752211c9638..676c57f5ca80 100644
--- a/include/rdma/ib_umem.h
+++ b/include/rdma/ib_umem.h
@@ -1,6 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
/*
* Copyright (c) 2007 Cisco Systems. All rights reserved.
+ * Copyright (c) 2020 Intel Corporation. All rights reserved.
*/
#ifndef IB_UMEM_H
@@ -13,6 +14,7 @@
struct ib_ucontext;
struct ib_umem_odp;
+struct dma_buf_attach_ops;
struct ib_umem {
struct ib_device *ibdev;
@@ -22,12 +24,29 @@ struct ib_umem {
unsigned long address;
u32 writable : 1;
u32 is_odp : 1;
+ u32 is_dmabuf : 1;
struct work_struct work;
struct sg_table sg_head;
int nmap;
unsigned int sg_nents;
};
+struct ib_umem_dmabuf {
+ struct ib_umem umem;
+ struct dma_buf_attachment *attach;
+ struct sg_table *sgt;
+ struct scatterlist *first_sg;
+ struct scatterlist *last_sg;
+ unsigned long first_sg_offset;
+ unsigned long last_sg_trim;
+ void *private;
+};
+
+static inline struct ib_umem_dmabuf *to_ib_umem_dmabuf(struct ib_umem *umem)
+{
+ return container_of(umem, struct ib_umem_dmabuf, umem);
+}
+
/* Returns the offset of the umem start relative to the first page. */
static inline int ib_umem_offset(struct ib_umem *umem)
{
@@ -86,6 +105,7 @@ int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem,
unsigned long pgsz_bitmap,
unsigned long virt);
+
/**
* ib_umem_find_best_pgoff - Find best HW page size
*
@@ -116,6 +136,14 @@ static inline unsigned long ib_umem_find_best_pgoff(struct ib_umem *umem,
dma_addr & pgoff_bitmask);
}
+struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device,
+ unsigned long offset, size_t size,
+ int fd, int access,
+ const struct dma_buf_attach_ops *ops);
+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);
+
#else /* CONFIG_INFINIBAND_USER_MEM */
#include <linux/err.h>
@@ -124,12 +152,12 @@ static inline struct ib_umem *ib_umem_get(struct ib_device *device,
unsigned long addr, size_t size,
int access)
{
- return ERR_PTR(-EINVAL);
+ return ERR_PTR(-EOPNOTSUPP);
}
static inline void ib_umem_release(struct ib_umem *umem) { }
static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
size_t length) {
- return -EINVAL;
+ return -EOPNOTSUPP;
}
static inline unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem,
unsigned long pgsz_bitmap,
@@ -143,7 +171,21 @@ static inline unsigned long ib_umem_find_best_pgoff(struct ib_umem *umem,
{
return 0;
}
+static inline
+struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device,
+ unsigned long offset,
+ size_t size, int fd,
+ int access,
+ struct dma_buf_attach_ops *ops)
+{
+ return ERR_PTR(-EOPNOTSUPP);
+}
+static inline int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf)
+{
+ return -EOPNOTSUPP;
+}
+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) { }
#endif /* CONFIG_INFINIBAND_USER_MEM */
-
#endif /* IB_UMEM_H */