linux/include/rdma/ib_umem_odp.h

/* 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 <rdma/ib_umem.h>
#include <rdma/ib_verbs.h>

struct ib_umem_odp { … };

static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)
{ … }

/* Returns the first page of an ODP umem. */
static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp)
{ … }

/* 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)
{ … }

static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp)
{ … }

/*
 * 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 …
#define ODP_WRITE_ALLOWED_BIT …

#define ODP_DMA_ADDR_MASK …

#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 */