202 lines
6.0 KiB
C
202 lines
6.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
|
|
/*
|
|
* Copyright (c) 2007 Cisco Systems. All rights reserved.
|
|
* Copyright (c) 2020 Intel Corporation. All rights reserved.
|
|
*/
|
|
|
|
#ifndef IB_UMEM_H
|
|
#define IB_UMEM_H
|
|
|
|
#include <linux/list.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/workqueue.h>
|
|
#include <rdma/ib_verbs.h>
|
|
|
|
struct ib_ucontext;
|
|
struct ib_umem_odp;
|
|
struct dma_buf_attach_ops;
|
|
|
|
struct ib_umem {
|
|
struct ib_device *ibdev;
|
|
struct mm_struct *owning_mm;
|
|
u64 iova;
|
|
size_t length;
|
|
unsigned long address;
|
|
u32 writable : 1;
|
|
u32 is_odp : 1;
|
|
u32 is_dmabuf : 1;
|
|
struct work_struct work;
|
|
struct sg_append_table sgt_append;
|
|
};
|
|
|
|
struct ib_umem_dmabuf {
|
|
struct ib_umem umem;
|
|
struct dma_buf_attachment *attach;
|
|
struct sg_table *sgt;
|
|
struct scatterlist *first_sg;
|
|
struct scatterlist *last_sg;
|
|
unsigned long first_sg_offset;
|
|
unsigned long last_sg_trim;
|
|
void *private;
|
|
u8 pinned : 1;
|
|
};
|
|
|
|
static inline struct ib_umem_dmabuf *to_ib_umem_dmabuf(struct ib_umem *umem)
|
|
{
|
|
return container_of(umem, struct ib_umem_dmabuf, umem);
|
|
}
|
|
|
|
/* Returns the offset of the umem start relative to the first page. */
|
|
static inline int ib_umem_offset(struct ib_umem *umem)
|
|
{
|
|
return umem->address & ~PAGE_MASK;
|
|
}
|
|
|
|
static inline unsigned long ib_umem_dma_offset(struct ib_umem *umem,
|
|
unsigned long pgsz)
|
|
{
|
|
return (sg_dma_address(umem->sgt_append.sgt.sgl) + ib_umem_offset(umem)) &
|
|
(pgsz - 1);
|
|
}
|
|
|
|
static inline size_t ib_umem_num_dma_blocks(struct ib_umem *umem,
|
|
unsigned long pgsz)
|
|
{
|
|
return (size_t)((ALIGN(umem->iova + umem->length, pgsz) -
|
|
ALIGN_DOWN(umem->iova, pgsz))) /
|
|
pgsz;
|
|
}
|
|
|
|
static inline size_t ib_umem_num_pages(struct ib_umem *umem)
|
|
{
|
|
return ib_umem_num_dma_blocks(umem, PAGE_SIZE);
|
|
}
|
|
|
|
static inline void __rdma_umem_block_iter_start(struct ib_block_iter *biter,
|
|
struct ib_umem *umem,
|
|
unsigned long pgsz)
|
|
{
|
|
__rdma_block_iter_start(biter, umem->sgt_append.sgt.sgl,
|
|
umem->sgt_append.sgt.nents, pgsz);
|
|
}
|
|
|
|
/**
|
|
* rdma_umem_for_each_dma_block - iterate over contiguous DMA blocks of the umem
|
|
* @umem: umem to iterate over
|
|
* @pgsz: Page size to split the list into
|
|
*
|
|
* pgsz must be <= PAGE_SIZE or computed by ib_umem_find_best_pgsz(). The
|
|
* returned DMA blocks will be aligned to pgsz and span the range:
|
|
* ALIGN_DOWN(umem->address, pgsz) to ALIGN(umem->address + umem->length, pgsz)
|
|
*
|
|
* Performs exactly ib_umem_num_dma_blocks() iterations.
|
|
*/
|
|
#define rdma_umem_for_each_dma_block(umem, biter, pgsz) \
|
|
for (__rdma_umem_block_iter_start(biter, umem, pgsz); \
|
|
__rdma_block_iter_next(biter);)
|
|
|
|
#ifdef CONFIG_INFINIBAND_USER_MEM
|
|
|
|
struct ib_umem *ib_umem_get(struct ib_device *device, unsigned long addr,
|
|
size_t size, int access);
|
|
void ib_umem_release(struct ib_umem *umem);
|
|
int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
|
|
size_t length);
|
|
unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem,
|
|
unsigned long pgsz_bitmap,
|
|
unsigned long virt);
|
|
|
|
/**
|
|
* ib_umem_find_best_pgoff - Find best HW page size
|
|
*
|
|
* @umem: umem struct
|
|
* @pgsz_bitmap bitmap of HW supported page sizes
|
|
* @pgoff_bitmask: Mask of bits that can be represented with an offset
|
|
*
|
|
* This is very similar to ib_umem_find_best_pgsz() except instead of accepting
|
|
* an IOVA it accepts a bitmask specifying what address bits can be represented
|
|
* with a page offset.
|
|
*
|
|
* For instance if the HW has multiple page sizes, requires 64 byte alignemnt,
|
|
* and can support aligned offsets up to 4032 then pgoff_bitmask would be
|
|
* "111111000000".
|
|
*
|
|
* If the pgoff_bitmask requires either alignment in the low bit or an
|
|
* unavailable page size for the high bits, this function returns 0.
|
|
*/
|
|
static inline unsigned long ib_umem_find_best_pgoff(struct ib_umem *umem,
|
|
unsigned long pgsz_bitmap,
|
|
u64 pgoff_bitmask)
|
|
{
|
|
struct scatterlist *sg = umem->sgt_append.sgt.sgl;
|
|
dma_addr_t dma_addr;
|
|
|
|
dma_addr = sg_dma_address(sg) + (umem->address & ~PAGE_MASK);
|
|
return ib_umem_find_best_pgsz(umem, pgsz_bitmap,
|
|
dma_addr & pgoff_bitmask);
|
|
}
|
|
|
|
struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device,
|
|
unsigned long offset, size_t size,
|
|
int fd, int access,
|
|
const struct dma_buf_attach_ops *ops);
|
|
struct ib_umem_dmabuf *ib_umem_dmabuf_get_pinned(struct ib_device *device,
|
|
unsigned long offset,
|
|
size_t size, int fd,
|
|
int access);
|
|
int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf);
|
|
void ib_umem_dmabuf_unmap_pages(struct ib_umem_dmabuf *umem_dmabuf);
|
|
void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf);
|
|
|
|
#else /* CONFIG_INFINIBAND_USER_MEM */
|
|
|
|
#include <linux/err.h>
|
|
|
|
static inline struct ib_umem *ib_umem_get(struct ib_device *device,
|
|
unsigned long addr, size_t size,
|
|
int access)
|
|
{
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
static inline void ib_umem_release(struct ib_umem *umem) { }
|
|
static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
|
|
size_t length) {
|
|
return -EOPNOTSUPP;
|
|
}
|
|
static inline unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem,
|
|
unsigned long pgsz_bitmap,
|
|
unsigned long virt)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline unsigned long ib_umem_find_best_pgoff(struct ib_umem *umem,
|
|
unsigned long pgsz_bitmap,
|
|
u64 pgoff_bitmask)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline
|
|
struct ib_umem_dmabuf *ib_umem_dmabuf_get(struct ib_device *device,
|
|
unsigned long offset,
|
|
size_t size, int fd,
|
|
int access,
|
|
struct dma_buf_attach_ops *ops)
|
|
{
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
static inline struct ib_umem_dmabuf *
|
|
ib_umem_dmabuf_get_pinned(struct ib_device *device, unsigned long offset,
|
|
size_t size, int fd, int access)
|
|
{
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
}
|
|
static inline int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
static inline void ib_umem_dmabuf_unmap_pages(struct ib_umem_dmabuf *umem_dmabuf) { }
|
|
static inline void ib_umem_dmabuf_release(struct ib_umem_dmabuf *umem_dmabuf) { }
|
|
|
|
#endif /* CONFIG_INFINIBAND_USER_MEM */
|
|
#endif /* IB_UMEM_H */
|