/* 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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