#include <linux/export.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
+#include <linux/count_zeros.h>
#include <rdma/ib_umem_odp.h>
#include "uverbs.h"
unsigned long virt)
{
struct scatterlist *sg;
- unsigned int best_pg_bit;
unsigned long va, pgoff;
dma_addr_t mask;
int i;
mask |= va;
pgoff = 0;
}
- best_pg_bit = rdma_find_pg_bit(mask, pgsz_bitmap);
- return BIT_ULL(best_pg_bit);
+ /* The mask accumulates 1's in each position where the VA and physical
+ * address differ, thus the length of trailing 0 is the largest page
+ * size that can pass the VA through to the physical.
+ */
+ if (mask)
+ pgsz_bitmap &= GENMASK(count_trailing_zeros(mask), 0);
+ return rounddown_pow_of_two(pgsz_bitmap);
}
EXPORT_SYMBOL(ib_umem_find_best_pgsz);
}
/**
- * rdma_find_pg_bit - Find page bit given address and HW supported page sizes
- *
- * @addr: address
- * @pgsz_bitmap: bitmap of HW supported page sizes
- */
-static inline unsigned int rdma_find_pg_bit(unsigned long addr,
- unsigned long pgsz_bitmap)
-{
- unsigned long align;
- unsigned long pgsz;
-
- align = addr & -addr;
-
- /* Find page bit such that addr is aligned to the highest supported
- * HW page size
- */
- pgsz = pgsz_bitmap & ~(-align << 1);
- if (!pgsz)
- return __ffs(pgsz_bitmap);
-
- return __fls(pgsz);
-}
-
-/**
* rdma_core_cap_opa_port - Return whether the RDMA Port is OPA or not.
* @device: Device
* @port_num: 1 based Port number