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(struct ib_device *base_dave, u64 start, 10 u64 len, int rights); 11 void siw_umem_release(struct siw_umem *umem); 12 struct siw_pbl *siw_pbl_alloc(u32 num_buf); 13 dma_addr_t siw_pbl_get_buffer(struct siw_pbl *pbl, u64 off, int *len, int *idx); 14 struct siw_mem *siw_mem_id2obj(struct siw_device *sdev, int stag_index); 15 int siw_mem_add(struct siw_device *sdev, struct siw_mem *m); 16 int siw_invalidate_stag(struct ib_pd *pd, u32 stag); 17 int siw_check_mem(struct ib_pd *pd, struct siw_mem *mem, u64 addr, 18 enum ib_access_flags perms, int len); 19 int siw_check_sge(struct ib_pd *pd, struct siw_sge *sge, 20 struct siw_mem *mem[], enum ib_access_flags perms, 21 u32 off, int len); 22 void siw_wqe_put_mem(struct siw_wqe *wqe, enum siw_opcode op); 23 int siw_mr_add_mem(struct siw_mr *mr, struct ib_pd *pd, void *mem_obj, 24 u64 start, u64 len, int rights); 25 void siw_mr_drop_mem(struct siw_mr *mr); 26 void siw_free_mem(struct kref *ref); 27 28 static inline void siw_mem_put(struct siw_mem *mem) 29 { 30 kref_put(&mem->ref, siw_free_mem); 31 } 32 33 static inline void siw_unref_mem_sgl(struct siw_mem **mem, unsigned int num_sge) 34 { 35 while (num_sge) { 36 if (*mem == NULL) 37 break; 38 39 siw_mem_put(*mem); 40 *mem = NULL; 41 mem++; 42 num_sge--; 43 } 44 } 45 46 #define CHUNK_SHIFT 9 /* sets number of pages per chunk */ 47 #define PAGES_PER_CHUNK (_AC(1, UL) << CHUNK_SHIFT) 48 #define CHUNK_MASK (~(PAGES_PER_CHUNK - 1)) 49 #define PAGE_CHUNK_SIZE (PAGES_PER_CHUNK * sizeof(struct page *)) 50 51 /* 52 * siw_get_upage() 53 * 54 * Get page pointer for address on given umem. 55 * 56 * @umem: two dimensional list of page pointers 57 * @addr: user virtual address 58 */ 59 static inline struct page *siw_get_upage(struct siw_umem *umem, u64 addr) 60 { 61 unsigned int page_idx = (addr - umem->fp_addr) >> PAGE_SHIFT, 62 chunk_idx = page_idx >> CHUNK_SHIFT, 63 page_in_chunk = page_idx & ~CHUNK_MASK; 64 65 if (likely(page_idx < umem->num_pages)) 66 return umem->page_chunk[chunk_idx].plist[page_in_chunk]; 67 68 return NULL; 69 } 70 #endif 71