116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/* 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 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 */
|