diff options
Diffstat (limited to 'include/rdma/ib_umem.h')
| -rw-r--r-- | include/rdma/ib_umem.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h index 70597508c765..7752211c9638 100644 --- a/include/rdma/ib_umem.h +++ b/include/rdma/ib_umem.h @@ -34,6 +34,13 @@ 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->sg_head.sgl) + ib_umem_offset(umem)) & + (pgsz - 1); +} + static inline size_t ib_umem_num_dma_blocks(struct ib_umem *umem, unsigned long pgsz) { @@ -79,6 +86,35 @@ int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset, 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->sg_head.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); +} #else /* CONFIG_INFINIBAND_USER_MEM */ @@ -101,6 +137,12 @@ static inline unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem, { return 0; } +static inline unsigned long ib_umem_find_best_pgoff(struct ib_umem *umem, + unsigned long pgsz_bitmap, + u64 pgoff_bitmask) +{ + return 0; +} #endif /* CONFIG_INFINIBAND_USER_MEM */ |