rdma/siw: application buffer management

Broken up commit to add the Soft iWarp RDMA driver.

Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

1 files changed, 74 insertions, 0 deletions

diff --git a/drivers/infiniband/sw/siw/siw_mem.h b/drivers/infiniband/sw/siw/siw_mem.h
new file mode 100644
index 000000000000..f43daf280891
--- /dev/null
+++ b/drivers/infiniband/sw/siw/siw_mem.h
@@ -0,0 +1,74 @@
+/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
+
+/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
+/* Copyright (c) 2008-2019, IBM Corporation */
+
+#ifndef _SIW_MEM_H
+#define _SIW_MEM_H
+
+struct siw_umem *siw_umem_get(u64 start, u64 len, bool writable);
+void siw_umem_release(struct siw_umem *umem, bool dirty);
+struct siw_pbl *siw_pbl_alloc(u32 num_buf);
+u64 siw_pbl_get_buffer(struct siw_pbl *pbl, u64 off, int *len, int *idx);
+struct siw_mem *siw_mem_id2obj(struct siw_device *sdev, int stag_index);
+int siw_mem_add(struct siw_device *sdev, struct siw_mem *m);
+int siw_invalidate_stag(struct ib_pd *pd, u32 stag);
+int siw_check_mem(struct ib_pd *pd, struct siw_mem *mem, u64 addr,
+		  enum ib_access_flags perms, int len);
+int siw_check_sge(struct ib_pd *pd, struct siw_sge *sge,
+		  struct siw_mem *mem[], enum ib_access_flags perms,
+		  u32 off, int len);
+void siw_wqe_put_mem(struct siw_wqe *wqe, enum siw_opcode op);
+int siw_mr_add_mem(struct siw_mr *mr, struct ib_pd *pd, void *mem_obj,
+		   u64 start, u64 len, int rights);
+void siw_mr_drop_mem(struct siw_mr *mr);
+void siw_free_mem(struct kref *ref);
+
+static inline void siw_mem_put(struct siw_mem *mem)
+{
+	kref_put(&mem->ref, siw_free_mem);
+}
+
+static inline struct siw_mr *siw_mem2mr(struct siw_mem *m)
+{
+	return container_of(m, struct siw_mr, mem);
+}
+
+static inline void siw_unref_mem_sgl(struct siw_mem **mem, unsigned int num_sge)
+{
+	while (num_sge) {
+		if (*mem == NULL)
+			break;
+
+		siw_mem_put(*mem);
+		*mem = NULL;
+		mem++;
+		num_sge--;
+	}
+}
+
+#define CHUNK_SHIFT 9 /* sets number of pages per chunk */
+#define PAGES_PER_CHUNK (_AC(1, UL) << CHUNK_SHIFT)
+#define CHUNK_MASK (~(PAGES_PER_CHUNK - 1))
+#define PAGE_CHUNK_SIZE (PAGES_PER_CHUNK * sizeof(struct page *))
+
+/*
+ * siw_get_upage()
+ *
+ * Get page pointer for address on given umem.
+ *
+ * @umem: two dimensional list of page pointers
+ * @addr: user virtual address
+ */
+static inline struct page *siw_get_upage(struct siw_umem *umem, u64 addr)
+{
+	unsigned int page_idx = (addr - umem->fp_addr) >> PAGE_SHIFT,
+		     chunk_idx = page_idx >> CHUNK_SHIFT,
+		     page_in_chunk = page_idx & ~CHUNK_MASK;
+
+	if (likely(page_idx < umem->num_pages))
+		return umem->page_chunk[chunk_idx].plist[page_in_chunk];
+
+	return NULL;
+}
+#endif