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Diffstat (limited to '')
| -rw-r--r-- | include/rdma/ib_umem.h | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h new file mode 100644 index 000000000..a1fd63871 --- /dev/null +++ b/include/rdma/ib_umem.h @@ -0,0 +1,108 @@ +/* + * Copyright (c) 2007 Cisco Systems. All rights reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#ifndef IB_UMEM_H +#define IB_UMEM_H + +#include <linux/list.h> +#include <linux/scatterlist.h> +#include <linux/workqueue.h> + +struct ib_ucontext; +struct ib_umem_odp; + +struct ib_umem { + struct ib_ucontext *context; + size_t length; + unsigned long address; + int page_shift; + int writable; + int hugetlb; + struct work_struct work; + struct mm_struct *mm; + unsigned long diff; + struct ib_umem_odp *odp_data; + struct sg_table sg_head; + int nmap; + int npages; +}; + +/* Returns the offset of the umem start relative to the first page. */ +static inline int ib_umem_offset(struct ib_umem *umem) +{ + return umem->address & (BIT(umem->page_shift) - 1); +} + +/* Returns the first page of an ODP umem. */ +static inline unsigned long ib_umem_start(struct ib_umem *umem) +{ + return umem->address - ib_umem_offset(umem); +} + +/* Returns the address of the page after the last one of an ODP umem. */ +static inline unsigned long ib_umem_end(struct ib_umem *umem) +{ + return ALIGN(umem->address + umem->length, BIT(umem->page_shift)); +} + +static inline size_t ib_umem_num_pages(struct ib_umem *umem) +{ + return (ib_umem_end(umem) - ib_umem_start(umem)) >> umem->page_shift; +} + +#ifdef CONFIG_INFINIBAND_USER_MEM + +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 */ + +#include <linux/err.h> + +static inline struct ib_umem *ib_umem_get(struct ib_ucontext *context, + unsigned long addr, size_t size, + int access, int dmasync) { + return ERR_PTR(-EINVAL); +} +static inline void ib_umem_release(struct ib_umem *umem) { } +static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; } +static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, + size_t length) { + return -EINVAL; +} +#endif /* CONFIG_INFINIBAND_USER_MEM */ + +#endif /* IB_UMEM_H */ |