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1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */2/*3 * Copyright (c) 2014 Mellanox Technologies. All rights reserved.4 */5 6#ifndef IB_UMEM_ODP_H7#define IB_UMEM_ODP_H8 9#include <rdma/ib_umem.h>10#include <rdma/ib_verbs.h>11 12struct ib_umem_odp {13 struct ib_umem umem;14 struct mmu_interval_notifier notifier;15 struct pid *tgid;16 17 /* An array of the pfns included in the on-demand paging umem. */18 unsigned long *pfn_list;19 20 /*21 * An array with DMA addresses mapped for pfns in pfn_list.22 * The lower two bits designate access permissions.23 * See ODP_READ_ALLOWED_BIT and ODP_WRITE_ALLOWED_BIT.24 */25 dma_addr_t *dma_list;26 /*27 * The umem_mutex protects the page_list and dma_list fields of an ODP28 * umem, allowing only a single thread to map/unmap pages. The mutex29 * also protects access to the mmu notifier counters.30 */31 struct mutex umem_mutex;32 void *private; /* for the HW driver to use. */33 34 int npages;35 36 /*37 * An implicit odp umem cannot be DMA mapped, has 0 length, and serves38 * only as an anchor for the driver to hold onto the per_mm. FIXME:39 * This should be removed and drivers should work with the per_mm40 * directly.41 */42 bool is_implicit_odp;43 44 unsigned int page_shift;45};46 47static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)48{49 return container_of(umem, struct ib_umem_odp, umem);50}51 52/* Returns the first page of an ODP umem. */53static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp)54{55 return umem_odp->notifier.interval_tree.start;56}57 58/* Returns the address of the page after the last one of an ODP umem. */59static inline unsigned long ib_umem_end(struct ib_umem_odp *umem_odp)60{61 return umem_odp->notifier.interval_tree.last + 1;62}63 64static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp)65{66 return (ib_umem_end(umem_odp) - ib_umem_start(umem_odp)) >>67 umem_odp->page_shift;68}69 70/*71 * The lower 2 bits of the DMA address signal the R/W permissions for72 * the entry. To upgrade the permissions, provide the appropriate73 * bitmask to the map_dma_pages function.74 *75 * Be aware that upgrading a mapped address might result in change of76 * the DMA address for the page.77 */78#define ODP_READ_ALLOWED_BIT (1<<0ULL)79#define ODP_WRITE_ALLOWED_BIT (1<<1ULL)80 81#define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT))82 83#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING84 85struct ib_umem_odp *86ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size,87 int access, const struct mmu_interval_notifier_ops *ops);88struct ib_umem_odp *ib_umem_odp_alloc_implicit(struct ib_device *device,89 int access);90struct ib_umem_odp *91ib_umem_odp_alloc_child(struct ib_umem_odp *root_umem, unsigned long addr,92 size_t size,93 const struct mmu_interval_notifier_ops *ops);94void ib_umem_odp_release(struct ib_umem_odp *umem_odp);95 96int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 start_offset,97 u64 bcnt, u64 access_mask, bool fault);98 99void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset,100 u64 bound);101 102#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */103 104static inline struct ib_umem_odp *105ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size,106 int access, const struct mmu_interval_notifier_ops *ops)107{108 return ERR_PTR(-EINVAL);109}110 111static inline void ib_umem_odp_release(struct ib_umem_odp *umem_odp) {}112 113#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */114 115#endif /* IB_UMEM_ODP_H */116