Revert "RDMA/hns: Fix base address table allocation"

driver inclusion
category: cleanup
bugzilla: https://gitee.com/openeuler/kernel/issues/I7RKQ1

---------------------------------------------------------------------------

This reverts commit cae22979.
Signed-off-by: NJuan Zhou <zhoujuan51@h-partners.com>

drivers/infiniband/hw/hns/hns_roce_mr.c

@@ -34,7 +34,6 @@
 #include <linux/vmalloc.h>
 #include <linux/count_zeros.h>
 #include <rdma/ib_umem.h>
-#include <linux/bitops.h>
 #include "hns_roce_device.h"
 #include "hns_roce_cmd.h"
 #include "hns_roce_hem.h"
@@ -1071,44 +1070,6 @@ static int mtr_init_buf_cfg(struct hns_roce_dev *hr_dev,
 	return 0;
 }
 
-static u64 cal_pages_per_l1ba(unsigned int ba_per_bt, unsigned int hopnum)
-{
-	return int_pow(ba_per_bt, hopnum - 1);
-}
-
-static unsigned int cal_best_bt_pg_sz(struct hns_roce_dev *hr_dev,
-				      struct hns_roce_mtr *mtr,
-				      unsigned int pg_shift)
-{
-	unsigned long cap = hr_dev->caps.page_size_cap;
-	struct hns_roce_buf_region *re;
-	unsigned int pgs_per_l1ba;
-	unsigned int ba_per_bt;
-	unsigned int ba_num;
-	int i;
-
-	for_each_set_bit_from(pg_shift, &cap, sizeof(cap) * BITS_PER_BYTE) {
-		if (!(BIT(pg_shift) & cap))
-			continue;
-
-		ba_per_bt = BIT(pg_shift) / BA_BYTE_LEN;
-		ba_num = 0;
-		for (i = 0; i < mtr->hem_cfg.region_count; i++) {
-			re = &mtr->hem_cfg.region[i];
-			if (re->hopnum == 0)
-				continue;
-
-			pgs_per_l1ba = cal_pages_per_l1ba(ba_per_bt, re->hopnum);
-			ba_num += DIV_ROUND_UP(re->count, pgs_per_l1ba);
-		}
-
-		if (ba_num <= ba_per_bt)
-			return pg_shift;
-	}
-
-	return 0;
-}
-
 static int mtr_alloc_mtt(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
 			 unsigned int ba_page_shift)
 {
@@ -1117,10 +1078,6 @@ static int mtr_alloc_mtt(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
 
 	hns_roce_hem_list_init(&mtr->hem_list);
 	if (!cfg->is_direct) {
-		ba_page_shift = cal_best_bt_pg_sz(hr_dev, mtr, ba_page_shift);
-		if (!ba_page_shift)
-			return -ERANGE;
-
 		ret = hns_roce_hem_list_request(hr_dev, &mtr->hem_list,
 						cfg->region, cfg->region_count,
 						ba_page_shift);