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115 lines
3.4 KiB
115 lines
3.4 KiB
/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ |
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/* |
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* Copyright (c) 2014 Mellanox Technologies. All rights reserved. |
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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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#include <rdma/ib_verbs.h> |
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struct ib_umem_odp { |
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struct ib_umem umem; |
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struct mmu_interval_notifier notifier; |
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struct pid *tgid; |
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/* An array of the pfns included in the on-demand paging umem. */ |
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unsigned long *pfn_list; |
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/* |
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* An array with DMA addresses mapped for pfns in pfn_list. |
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* The lower two bits designate access permissions. |
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* See ODP_READ_ALLOWED_BIT and 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. The mutex |
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* also protects access to the mmu notifier counters. |
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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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int npages; |
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/* |
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* An implicit odp umem cannot be DMA mapped, has 0 length, and serves |
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* only as an anchor for the driver to hold onto the per_mm. FIXME: |
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* This should be removed and drivers should work with the per_mm |
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* directly. |
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*/ |
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bool is_implicit_odp; |
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unsigned int page_shift; |
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}; |
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static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem) |
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{ |
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return container_of(umem, struct ib_umem_odp, umem); |
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} |
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/* Returns the first page of an ODP umem. */ |
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static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp) |
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{ |
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return umem_odp->notifier.interval_tree.start; |
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} |
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/* Returns the address of the page after the last one of an ODP umem. */ |
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static inline unsigned long ib_umem_end(struct ib_umem_odp *umem_odp) |
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{ |
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return umem_odp->notifier.interval_tree.last + 1; |
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} |
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static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp) |
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{ |
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return (ib_umem_end(umem_odp) - ib_umem_start(umem_odp)) >> |
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umem_odp->page_shift; |
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} |
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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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#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING |
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struct ib_umem_odp * |
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ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size, |
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int access, const struct mmu_interval_notifier_ops *ops); |
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struct ib_umem_odp *ib_umem_odp_alloc_implicit(struct ib_device *device, |
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int access); |
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struct ib_umem_odp * |
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ib_umem_odp_alloc_child(struct ib_umem_odp *root_umem, unsigned long addr, |
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size_t size, |
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const struct mmu_interval_notifier_ops *ops); |
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void ib_umem_odp_release(struct ib_umem_odp *umem_odp); |
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int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 start_offset, |
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u64 bcnt, u64 access_mask, bool fault); |
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void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, 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 struct ib_umem_odp * |
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ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size, |
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int access, const struct mmu_interval_notifier_ops *ops) |
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{ |
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return ERR_PTR(-EINVAL); |
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} |
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static inline void ib_umem_odp_release(struct ib_umem_odp *umem_odp) {} |
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#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */ |
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#endif /* IB_UMEM_ODP_H */
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