1 /* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
2 
3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
4 /* Copyright (c) 2008-2019, IBM Corporation */
5 
6 #ifndef _SIW_MEM_H
7 #define _SIW_MEM_H
8 
9 struct siw_umem *siw_umem_get(u64 start, u64 len, bool writable);
10 void siw_umem_release(struct siw_umem *umem, bool dirty);
11 struct siw_pbl *siw_pbl_alloc(u32 num_buf);
12 dma_addr_t siw_pbl_get_buffer(struct siw_pbl *pbl, u64 off, int *len, int *idx);
13 struct siw_mem *siw_mem_id2obj(struct siw_device *sdev, int stag_index);
14 int siw_mem_add(struct siw_device *sdev, struct siw_mem *m);
15 int siw_invalidate_stag(struct ib_pd *pd, u32 stag);
16 int siw_check_mem(struct ib_pd *pd, struct siw_mem *mem, u64 addr,
17 		  enum ib_access_flags perms, int len);
18 int siw_check_sge(struct ib_pd *pd, struct siw_sge *sge,
19 		  struct siw_mem *mem[], enum ib_access_flags perms,
20 		  u32 off, int len);
21 void siw_wqe_put_mem(struct siw_wqe *wqe, enum siw_opcode op);
22 int siw_mr_add_mem(struct siw_mr *mr, struct ib_pd *pd, void *mem_obj,
23 		   u64 start, u64 len, int rights);
24 void siw_mr_drop_mem(struct siw_mr *mr);
25 void siw_free_mem(struct kref *ref);
26 
27 static inline void siw_mem_put(struct siw_mem *mem)
28 {
29 	kref_put(&mem->ref, siw_free_mem);
30 }
31 
32 static inline void siw_unref_mem_sgl(struct siw_mem **mem, unsigned int num_sge)
33 {
34 	while (num_sge) {
35 		if (*mem == NULL)
36 			break;
37 
38 		siw_mem_put(*mem);
39 		*mem = NULL;
40 		mem++;
41 		num_sge--;
42 	}
43 }
44 
45 #define CHUNK_SHIFT 9 /* sets number of pages per chunk */
46 #define PAGES_PER_CHUNK (_AC(1, UL) << CHUNK_SHIFT)
47 #define CHUNK_MASK (~(PAGES_PER_CHUNK - 1))
48 #define PAGE_CHUNK_SIZE (PAGES_PER_CHUNK * sizeof(struct page *))
49 
50 /*
51  * siw_get_upage()
52  *
53  * Get page pointer for address on given umem.
54  *
55  * @umem: two dimensional list of page pointers
56  * @addr: user virtual address
57  */
58 static inline struct page *siw_get_upage(struct siw_umem *umem, u64 addr)
59 {
60 	unsigned int page_idx = (addr - umem->fp_addr) >> PAGE_SHIFT,
61 		     chunk_idx = page_idx >> CHUNK_SHIFT,
62 		     page_in_chunk = page_idx & ~CHUNK_MASK;
63 
64 	if (likely(page_idx < umem->num_pages))
65 		return umem->page_chunk[chunk_idx].plist[page_in_chunk];
66 
67 	return NULL;
68 }
69 #endif
70