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8ada2c1c0c
* Extend the umem struct to keep the ODP related data. * Allocate and initialize the ODP related information in the umem (page_list, dma_list) and freeing as needed in the end of the run. * Store a reference to the process PID struct in the ucontext. Used to safely obtain the task_struct and the mm during fault handling, without preventing the task destruction if needed. * Add 2 helper functions: ib_umem_odp_map_dma_pages and ib_umem_odp_unmap_dma_pages. These functions get the DMA addresses of specific pages of the umem (and, currently, pin them). * Support for page faults only - IB core will keep the reference on the pages used and call put_page when freeing an ODP umem area. Invalidations support will be added in a later patch. Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Shachar Raindel <raindel@mellanox.com> Signed-off-by: Haggai Eran <haggaie@mellanox.com> Signed-off-by: Majd Dibbiny <majd@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
/*
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* Copyright (c) 2014 Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef IB_UMEM_ODP_H
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#define IB_UMEM_ODP_H
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#include <rdma/ib_umem.h>
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struct ib_umem_odp {
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/*
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* An array of the pages included in the on-demand paging umem.
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* Indices of pages that are currently not mapped into the device will
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* contain NULL.
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*/
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struct page **page_list;
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/*
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* An array of the same size as page_list, with DMA addresses mapped
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* for pages the pages in page_list. The lower two bits designate
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* access permissions. See ODP_READ_ALLOWED_BIT and
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* ODP_WRITE_ALLOWED_BIT.
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*/
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dma_addr_t *dma_list;
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/*
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* The umem_mutex protects the page_list and dma_list fields of an ODP
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* umem, allowing only a single thread to map/unmap pages.
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*/
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struct mutex umem_mutex;
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void *private; /* for the HW driver to use. */
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};
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#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
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int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem);
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void ib_umem_odp_release(struct ib_umem *umem);
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/*
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* The lower 2 bits of the DMA address signal the R/W permissions for
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* the entry. To upgrade the permissions, provide the appropriate
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* bitmask to the map_dma_pages function.
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*
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* Be aware that upgrading a mapped address might result in change of
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* the DMA address for the page.
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*/
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#define ODP_READ_ALLOWED_BIT (1<<0ULL)
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#define ODP_WRITE_ALLOWED_BIT (1<<1ULL)
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#define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT))
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int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 start_offset, u64 bcnt,
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u64 access_mask, unsigned long current_seq);
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void ib_umem_odp_unmap_dma_pages(struct ib_umem *umem, u64 start_offset,
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u64 bound);
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#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
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static inline int ib_umem_odp_get(struct ib_ucontext *context,
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struct ib_umem *umem)
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{
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return -EINVAL;
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}
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static inline void ib_umem_odp_release(struct ib_umem *umem) {}
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#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
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#endif /* IB_UMEM_ODP_H */
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