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Diffstat (limited to 'include/rdma/ib_umem.h')
-rw-r--r--include/rdma/ib_umem.h46
1 files changed, 37 insertions, 9 deletions
diff --git a/include/rdma/ib_umem.h b/include/rdma/ib_umem.h
index 71f573a418bf..70597508c765 100644
--- a/include/rdma/ib_umem.h
+++ b/include/rdma/ib_umem.h
@@ -17,6 +17,7 @@ struct ib_umem_odp;
struct ib_umem {
struct ib_device *ibdev;
struct mm_struct *owning_mm;
+ u64 iova;
size_t length;
unsigned long address;
u32 writable : 1;
@@ -33,19 +34,46 @@ static inline int ib_umem_offset(struct ib_umem *umem)
return umem->address & ~PAGE_MASK;
}
+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 (ALIGN(umem->address + umem->length, PAGE_SIZE) -
- ALIGN_DOWN(umem->address, PAGE_SIZE)) >>
- PAGE_SHIFT;
+ 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->sg_head.sgl, umem->nmap, 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_page_count(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,
@@ -63,15 +91,15 @@ static inline struct ib_umem *ib_umem_get(struct ib_device *device,
return ERR_PTR(-EINVAL);
}
static inline void ib_umem_release(struct ib_umem *umem) { }
-static inline int ib_umem_page_count(struct ib_umem *umem) { return 0; }
static inline int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
size_t length) {
return -EINVAL;
}
-static inline int ib_umem_find_best_pgsz(struct ib_umem *umem,
- unsigned long pgsz_bitmap,
- unsigned long virt) {
- return -EINVAL;
+static inline unsigned long ib_umem_find_best_pgsz(struct ib_umem *umem,
+ unsigned long pgsz_bitmap,
+ unsigned long virt)
+{
+ return 0;
}
#endif /* CONFIG_INFINIBAND_USER_MEM */