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