From 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 27 Apr 2024 12:05:51 +0200 Subject: Adding upstream version 5.10.209. Signed-off-by: Daniel Baumann --- include/rdma/ib_umem_odp.h | 115 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100644 include/rdma/ib_umem_odp.h (limited to 'include/rdma/ib_umem_odp.h') diff --git a/include/rdma/ib_umem_odp.h b/include/rdma/ib_umem_odp.h new file mode 100644 index 000000000..0844c1d05 --- /dev/null +++ b/include/rdma/ib_umem_odp.h @@ -0,0 +1,115 @@ +/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ +/* + * Copyright (c) 2014 Mellanox Technologies. All rights reserved. + */ + +#ifndef IB_UMEM_ODP_H +#define IB_UMEM_ODP_H + +#include +#include + +struct ib_umem_odp { + struct ib_umem umem; + struct mmu_interval_notifier notifier; + struct pid *tgid; + + /* An array of the pfns included in the on-demand paging umem. */ + unsigned long *pfn_list; + + /* + * An array with DMA addresses mapped for pfns in pfn_list. + * The lower two bits designate access permissions. + * See ODP_READ_ALLOWED_BIT and ODP_WRITE_ALLOWED_BIT. + */ + dma_addr_t *dma_list; + /* + * The umem_mutex protects the page_list and dma_list fields of an ODP + * umem, allowing only a single thread to map/unmap pages. The mutex + * also protects access to the mmu notifier counters. + */ + struct mutex umem_mutex; + void *private; /* for the HW driver to use. */ + + int npages; + + /* + * An implicit odp umem cannot be DMA mapped, has 0 length, and serves + * only as an anchor for the driver to hold onto the per_mm. FIXME: + * This should be removed and drivers should work with the per_mm + * directly. + */ + bool is_implicit_odp; + + unsigned int page_shift; +}; + +static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem) +{ + return container_of(umem, struct ib_umem_odp, umem); +} + +/* Returns the first page of an ODP umem. */ +static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp) +{ + return umem_odp->notifier.interval_tree.start; +} + +/* Returns the address of the page after the last one of an ODP umem. */ +static inline unsigned long ib_umem_end(struct ib_umem_odp *umem_odp) +{ + return umem_odp->notifier.interval_tree.last + 1; +} + +static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp) +{ + return (ib_umem_end(umem_odp) - ib_umem_start(umem_odp)) >> + umem_odp->page_shift; +} + +/* + * The lower 2 bits of the DMA address signal the R/W permissions for + * the entry. To upgrade the permissions, provide the appropriate + * bitmask to the map_dma_pages function. + * + * Be aware that upgrading a mapped address might result in change of + * the DMA address for the page. + */ +#define ODP_READ_ALLOWED_BIT (1<<0ULL) +#define ODP_WRITE_ALLOWED_BIT (1<<1ULL) + +#define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT)) + +#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING + +struct ib_umem_odp * +ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size, + int access, const struct mmu_interval_notifier_ops *ops); +struct ib_umem_odp *ib_umem_odp_alloc_implicit(struct ib_device *device, + int access); +struct ib_umem_odp * +ib_umem_odp_alloc_child(struct ib_umem_odp *root_umem, unsigned long addr, + size_t size, + const struct mmu_interval_notifier_ops *ops); +void ib_umem_odp_release(struct ib_umem_odp *umem_odp); + +int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 start_offset, + u64 bcnt, u64 access_mask, bool fault); + +void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset, + u64 bound); + +#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */ + +static inline struct ib_umem_odp * +ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size, + int access, const struct mmu_interval_notifier_ops *ops) +{ + return ERR_PTR(-EINVAL); +} + +static inline void ib_umem_odp_release(struct ib_umem_odp *umem_odp) {} + +#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */ + +#endif /* IB_UMEM_ODP_H */ -- cgit v1.2.3