IB/core: Add umem function to read data from user-space

In some drivers there's a need to read data from a user space area
that was pinned using ib_umem when running from a different process
context.

The ib_umem_copy_from function allows reading data from the physical
pages pinned in the ib_umem struct.

Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

2 files changed, 36 insertions, 0 deletions

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index e0f883292374..6f152628e0d2 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -292,3 +292,37 @@ int ib_umem_page_count(struct ib_umem *umem)
         return n;
 }
 EXPORT_SYMBOL(ib_umem_page_count);
+
+/*
+ * Copy from the given ib_umem's pages to the given buffer.
+ *
+ * umem - the umem to copy from
+ * offset - offset to start copying from
+ * dst - destination buffer
+ * length - buffer length
+ *
+ * Returns 0 on success, or an error code.
+ */
+int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
+                      size_t length)
+{
+        size_t end = offset + length;
+        int ret;
+
+        if (offset > umem->length || length > umem->length - offset) {
+                pr_err("ib_umem_copy_from not in range. offset: %zd umem length: %zd end: %zd\n",
+                       offset, umem->length, end);
+                return -EINVAL;
+        }
+
+        ret = sg_pcopy_to_buffer(umem->sg_head.sgl, umem->nmap, dst, length,
+                                 offset + ib_umem_offset(umem));
+
+        if (ret < 0)
+                return ret;
+        else if (ret != length)
+                return -EINVAL;
+        else
+                return 0;
+}
+EXPORT_SYMBOL(ib_umem_copy_from);
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
index 7ed6d4ff58dc..45bb04bc88cd 100644
--- a/include/rdma/ib_umem.h
+++ b/include/rdma/ib_umem.h
@@ -84,6 +84,8 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
                             size_t size, int access, int dmasync);
 void ib_umem_release(struct ib_umem *umem);
 int ib_umem_page_count(struct ib_umem *umem);
+int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
+                      size_t length);
 
 #else /* CONFIG_INFINIBAND_USER_MEM */