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/* 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 {
struct ib_umem umem;
struct mmu_interval_notifier notifier;
struct pid *tgid;
/*
* An array of the pages included in the on-demand paging umem.
* Indices of pages that are currently not mapped into the device will
* contain NULL.
*/
struct page **page_list;
/*
* An array of the same size as page_list, with DMA addresses mapped
* for pages the pages in page_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_pages(struct ib_umem_odp *umem_odp, u64 start_offset,
u64 bcnt, u64 access_mask,
unsigned long current_seq);
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 */
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