Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1052 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/hns/hns_roce_mr.c b/drivers/infiniband/hw/hns/hns_roce_mr.c
new file mode 100644
index 000000000..14376490a
--- /dev/null
+++ b/drivers/infiniband/hw/hns/hns_roce_mr.c
@@ -0,0 +1,1052 @@
+/*
+ * Copyright (c) 2016 Hisilicon Limited.
+ * Copyright (c) 2007, 2008 Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/vmalloc.h>
+#include <rdma/ib_umem.h>
+#include <linux/math.h>
+#include "hns_roce_device.h"
+#include "hns_roce_cmd.h"
+#include "hns_roce_hem.h"
+
+static u32 hw_index_to_key(int ind)
+{
+	return ((u32)ind >> 24) | ((u32)ind << 8);
+}
+
+unsigned long key_to_hw_index(u32 key)
+{
+	return (key << 24) | (key >> 8);
+}
+
+static int alloc_mr_key(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr)
+{
+	struct hns_roce_ida *mtpt_ida = &hr_dev->mr_table.mtpt_ida;
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	int err;
+	int id;
+
+	/* Allocate a key for mr from mr_table */
+	id = ida_alloc_range(&mtpt_ida->ida, mtpt_ida->min, mtpt_ida->max,
+			     GFP_KERNEL);
+	if (id < 0) {
+		ibdev_err(ibdev, "failed to alloc id for MR key, id(%d)\n", id);
+		return -ENOMEM;
+	}
+
+	mr->key = hw_index_to_key(id); /* MR key */
+
+	err = hns_roce_table_get(hr_dev, &hr_dev->mr_table.mtpt_table,
+				 (unsigned long)id);
+	if (err) {
+		ibdev_err(ibdev, "failed to alloc mtpt, ret = %d.\n", err);
+		goto err_free_bitmap;
+	}
+
+	return 0;
+err_free_bitmap:
+	ida_free(&mtpt_ida->ida, id);
+	return err;
+}
+
+static void free_mr_key(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr)
+{
+	unsigned long obj = key_to_hw_index(mr->key);
+
+	hns_roce_table_put(hr_dev, &hr_dev->mr_table.mtpt_table, obj);
+	ida_free(&hr_dev->mr_table.mtpt_ida.ida, (int)obj);
+}
+
+static int alloc_mr_pbl(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr,
+			struct ib_udata *udata, u64 start)
+{
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	bool is_fast = mr->type == MR_TYPE_FRMR;
+	struct hns_roce_buf_attr buf_attr = {};
+	int err;
+
+	mr->pbl_hop_num = is_fast ? 1 : hr_dev->caps.pbl_hop_num;
+	buf_attr.page_shift = is_fast ? PAGE_SHIFT :
+			      hr_dev->caps.pbl_buf_pg_sz + PAGE_SHIFT;
+	buf_attr.region[0].size = mr->size;
+	buf_attr.region[0].hopnum = mr->pbl_hop_num;
+	buf_attr.region_count = 1;
+	buf_attr.user_access = mr->access;
+	/* fast MR's buffer is alloced before mapping, not at creation */
+	buf_attr.mtt_only = is_fast;
+
+	err = hns_roce_mtr_create(hr_dev, &mr->pbl_mtr, &buf_attr,
+				  hr_dev->caps.pbl_ba_pg_sz + PAGE_SHIFT,
+				  udata, start);
+	if (err)
+		ibdev_err(ibdev, "failed to alloc pbl mtr, ret = %d.\n", err);
+	else
+		mr->npages = mr->pbl_mtr.hem_cfg.buf_pg_count;
+
+	return err;
+}
+
+static void free_mr_pbl(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr)
+{
+	hns_roce_mtr_destroy(hr_dev, &mr->pbl_mtr);
+}
+
+static void hns_roce_mr_free(struct hns_roce_dev *hr_dev, struct hns_roce_mr *mr)
+{
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	int ret;
+
+	if (mr->enabled) {
+		ret = hns_roce_destroy_hw_ctx(hr_dev, HNS_ROCE_CMD_DESTROY_MPT,
+					      key_to_hw_index(mr->key) &
+					      (hr_dev->caps.num_mtpts - 1));
+		if (ret)
+			ibdev_warn(ibdev, "failed to destroy mpt, ret = %d.\n",
+				   ret);
+	}
+
+	free_mr_pbl(hr_dev, mr);
+	free_mr_key(hr_dev, mr);
+}
+
+static int hns_roce_mr_enable(struct hns_roce_dev *hr_dev,
+			      struct hns_roce_mr *mr)
+{
+	unsigned long mtpt_idx = key_to_hw_index(mr->key);
+	struct hns_roce_cmd_mailbox *mailbox;
+	struct device *dev = hr_dev->dev;
+	int ret;
+
+	/* Allocate mailbox memory */
+	mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
+	if (IS_ERR(mailbox))
+		return PTR_ERR(mailbox);
+
+	if (mr->type != MR_TYPE_FRMR)
+		ret = hr_dev->hw->write_mtpt(hr_dev, mailbox->buf, mr);
+	else
+		ret = hr_dev->hw->frmr_write_mtpt(hr_dev, mailbox->buf, mr);
+	if (ret) {
+		dev_err(dev, "failed to write mtpt, ret = %d.\n", ret);
+		goto err_page;
+	}
+
+	ret = hns_roce_create_hw_ctx(hr_dev, mailbox, HNS_ROCE_CMD_CREATE_MPT,
+				     mtpt_idx & (hr_dev->caps.num_mtpts - 1));
+	if (ret) {
+		dev_err(dev, "failed to create mpt, ret = %d.\n", ret);
+		goto err_page;
+	}
+
+	mr->enabled = 1;
+
+err_page:
+	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
+
+	return ret;
+}
+
+void hns_roce_init_mr_table(struct hns_roce_dev *hr_dev)
+{
+	struct hns_roce_ida *mtpt_ida = &hr_dev->mr_table.mtpt_ida;
+
+	ida_init(&mtpt_ida->ida);
+	mtpt_ida->max = hr_dev->caps.num_mtpts - 1;
+	mtpt_ida->min = hr_dev->caps.reserved_mrws;
+}
+
+struct ib_mr *hns_roce_get_dma_mr(struct ib_pd *pd, int acc)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(pd->device);
+	struct hns_roce_mr *mr;
+	int ret;
+
+	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
+	if (!mr)
+		return  ERR_PTR(-ENOMEM);
+
+	mr->type = MR_TYPE_DMA;
+	mr->pd = to_hr_pd(pd)->pdn;
+	mr->access = acc;
+
+	/* Allocate memory region key */
+	hns_roce_hem_list_init(&mr->pbl_mtr.hem_list);
+	ret = alloc_mr_key(hr_dev, mr);
+	if (ret)
+		goto err_free;
+
+	ret = hns_roce_mr_enable(hr_dev, mr);
+	if (ret)
+		goto err_mr;
+
+	mr->ibmr.rkey = mr->ibmr.lkey = mr->key;
+
+	return &mr->ibmr;
+err_mr:
+	free_mr_key(hr_dev, mr);
+
+err_free:
+	kfree(mr);
+	return ERR_PTR(ret);
+}
+
+struct ib_mr *hns_roce_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
+				   u64 virt_addr, int access_flags,
+				   struct ib_udata *udata)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(pd->device);
+	struct hns_roce_mr *mr;
+	int ret;
+
+	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
+	if (!mr)
+		return ERR_PTR(-ENOMEM);
+
+	mr->iova = virt_addr;
+	mr->size = length;
+	mr->pd = to_hr_pd(pd)->pdn;
+	mr->access = access_flags;
+	mr->type = MR_TYPE_MR;
+
+	ret = alloc_mr_key(hr_dev, mr);
+	if (ret)
+		goto err_alloc_mr;
+
+	ret = alloc_mr_pbl(hr_dev, mr, udata, start);
+	if (ret)
+		goto err_alloc_key;
+
+	ret = hns_roce_mr_enable(hr_dev, mr);
+	if (ret)
+		goto err_alloc_pbl;
+
+	mr->ibmr.rkey = mr->ibmr.lkey = mr->key;
+
+	return &mr->ibmr;
+
+err_alloc_pbl:
+	free_mr_pbl(hr_dev, mr);
+err_alloc_key:
+	free_mr_key(hr_dev, mr);
+err_alloc_mr:
+	kfree(mr);
+	return ERR_PTR(ret);
+}
+
+struct ib_mr *hns_roce_rereg_user_mr(struct ib_mr *ibmr, int flags, u64 start,
+				     u64 length, u64 virt_addr,
+				     int mr_access_flags, struct ib_pd *pd,
+				     struct ib_udata *udata)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(ibmr->device);
+	struct ib_device *ib_dev = &hr_dev->ib_dev;
+	struct hns_roce_mr *mr = to_hr_mr(ibmr);
+	struct hns_roce_cmd_mailbox *mailbox;
+	unsigned long mtpt_idx;
+	int ret;
+
+	if (!mr->enabled)
+		return ERR_PTR(-EINVAL);
+
+	mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
+	if (IS_ERR(mailbox))
+		return ERR_CAST(mailbox);
+
+	mtpt_idx = key_to_hw_index(mr->key) & (hr_dev->caps.num_mtpts - 1);
+
+	ret = hns_roce_cmd_mbox(hr_dev, 0, mailbox->dma, HNS_ROCE_CMD_QUERY_MPT,
+				mtpt_idx);
+	if (ret)
+		goto free_cmd_mbox;
+
+	ret = hns_roce_destroy_hw_ctx(hr_dev, HNS_ROCE_CMD_DESTROY_MPT,
+				      mtpt_idx);
+	if (ret)
+		ibdev_warn(ib_dev, "failed to destroy MPT, ret = %d.\n", ret);
+
+	mr->enabled = 0;
+	mr->iova = virt_addr;
+	mr->size = length;
+
+	if (flags & IB_MR_REREG_PD)
+		mr->pd = to_hr_pd(pd)->pdn;
+
+	if (flags & IB_MR_REREG_ACCESS)
+		mr->access = mr_access_flags;
+
+	if (flags & IB_MR_REREG_TRANS) {
+		free_mr_pbl(hr_dev, mr);
+		ret = alloc_mr_pbl(hr_dev, mr, udata, start);
+		if (ret) {
+			ibdev_err(ib_dev, "failed to alloc mr PBL, ret = %d.\n",
+				  ret);
+			goto free_cmd_mbox;
+		}
+	}
+
+	ret = hr_dev->hw->rereg_write_mtpt(hr_dev, mr, flags, mailbox->buf);
+	if (ret) {
+		ibdev_err(ib_dev, "failed to write mtpt, ret = %d.\n", ret);
+		goto free_cmd_mbox;
+	}
+
+	ret = hns_roce_create_hw_ctx(hr_dev, mailbox, HNS_ROCE_CMD_CREATE_MPT,
+				     mtpt_idx);
+	if (ret) {
+		ibdev_err(ib_dev, "failed to create MPT, ret = %d.\n", ret);
+		goto free_cmd_mbox;
+	}
+
+	mr->enabled = 1;
+
+free_cmd_mbox:
+	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
+
+	if (ret)
+		return ERR_PTR(ret);
+	return NULL;
+}
+
+int hns_roce_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(ibmr->device);
+	struct hns_roce_mr *mr = to_hr_mr(ibmr);
+
+	if (hr_dev->hw->dereg_mr)
+		hr_dev->hw->dereg_mr(hr_dev);
+
+	hns_roce_mr_free(hr_dev, mr);
+	kfree(mr);
+
+	return 0;
+}
+
+struct ib_mr *hns_roce_alloc_mr(struct ib_pd *pd, enum ib_mr_type mr_type,
+				u32 max_num_sg)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(pd->device);
+	struct device *dev = hr_dev->dev;
+	struct hns_roce_mr *mr;
+	int ret;
+
+	if (mr_type != IB_MR_TYPE_MEM_REG)
+		return ERR_PTR(-EINVAL);
+
+	if (max_num_sg > HNS_ROCE_FRMR_MAX_PA) {
+		dev_err(dev, "max_num_sg larger than %d\n",
+			HNS_ROCE_FRMR_MAX_PA);
+		return ERR_PTR(-EINVAL);
+	}
+
+	mr = kzalloc(sizeof(*mr), GFP_KERNEL);
+	if (!mr)
+		return ERR_PTR(-ENOMEM);
+
+	mr->type = MR_TYPE_FRMR;
+	mr->pd = to_hr_pd(pd)->pdn;
+	mr->size = max_num_sg * (1 << PAGE_SHIFT);
+
+	/* Allocate memory region key */
+	ret = alloc_mr_key(hr_dev, mr);
+	if (ret)
+		goto err_free;
+
+	ret = alloc_mr_pbl(hr_dev, mr, NULL, 0);
+	if (ret)
+		goto err_key;
+
+	ret = hns_roce_mr_enable(hr_dev, mr);
+	if (ret)
+		goto err_pbl;
+
+	mr->ibmr.rkey = mr->ibmr.lkey = mr->key;
+	mr->ibmr.length = mr->size;
+
+	return &mr->ibmr;
+
+err_pbl:
+	free_mr_pbl(hr_dev, mr);
+err_key:
+	free_mr_key(hr_dev, mr);
+err_free:
+	kfree(mr);
+	return ERR_PTR(ret);
+}
+
+static int hns_roce_set_page(struct ib_mr *ibmr, u64 addr)
+{
+	struct hns_roce_mr *mr = to_hr_mr(ibmr);
+
+	if (likely(mr->npages < mr->pbl_mtr.hem_cfg.buf_pg_count)) {
+		mr->page_list[mr->npages++] = addr;
+		return 0;
+	}
+
+	return -ENOBUFS;
+}
+
+int hns_roce_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg, int sg_nents,
+		       unsigned int *sg_offset)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(ibmr->device);
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	struct hns_roce_mr *mr = to_hr_mr(ibmr);
+	struct hns_roce_mtr *mtr = &mr->pbl_mtr;
+	int ret = 0;
+
+	mr->npages = 0;
+	mr->page_list = kvcalloc(mr->pbl_mtr.hem_cfg.buf_pg_count,
+				 sizeof(dma_addr_t), GFP_KERNEL);
+	if (!mr->page_list)
+		return ret;
+
+	ret = ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset, hns_roce_set_page);
+	if (ret < 1) {
+		ibdev_err(ibdev, "failed to store sg pages %u %u, cnt = %d.\n",
+			  mr->npages, mr->pbl_mtr.hem_cfg.buf_pg_count, ret);
+		goto err_page_list;
+	}
+
+	mtr->hem_cfg.region[0].offset = 0;
+	mtr->hem_cfg.region[0].count = mr->npages;
+	mtr->hem_cfg.region[0].hopnum = mr->pbl_hop_num;
+	mtr->hem_cfg.region_count = 1;
+	ret = hns_roce_mtr_map(hr_dev, mtr, mr->page_list, mr->npages);
+	if (ret) {
+		ibdev_err(ibdev, "failed to map sg mtr, ret = %d.\n", ret);
+		ret = 0;
+	} else {
+		mr->pbl_mtr.hem_cfg.buf_pg_shift = (u32)ilog2(ibmr->page_size);
+		ret = mr->npages;
+	}
+
+err_page_list:
+	kvfree(mr->page_list);
+	mr->page_list = NULL;
+
+	return ret;
+}
+
+static void hns_roce_mw_free(struct hns_roce_dev *hr_dev,
+			     struct hns_roce_mw *mw)
+{
+	struct device *dev = hr_dev->dev;
+	int ret;
+
+	if (mw->enabled) {
+		ret = hns_roce_destroy_hw_ctx(hr_dev, HNS_ROCE_CMD_DESTROY_MPT,
+					      key_to_hw_index(mw->rkey) &
+					      (hr_dev->caps.num_mtpts - 1));
+		if (ret)
+			dev_warn(dev, "MW DESTROY_MPT failed (%d)\n", ret);
+
+		hns_roce_table_put(hr_dev, &hr_dev->mr_table.mtpt_table,
+				   key_to_hw_index(mw->rkey));
+	}
+
+	ida_free(&hr_dev->mr_table.mtpt_ida.ida,
+		 (int)key_to_hw_index(mw->rkey));
+}
+
+static int hns_roce_mw_enable(struct hns_roce_dev *hr_dev,
+			      struct hns_roce_mw *mw)
+{
+	struct hns_roce_mr_table *mr_table = &hr_dev->mr_table;
+	struct hns_roce_cmd_mailbox *mailbox;
+	struct device *dev = hr_dev->dev;
+	unsigned long mtpt_idx = key_to_hw_index(mw->rkey);
+	int ret;
+
+	/* prepare HEM entry memory */
+	ret = hns_roce_table_get(hr_dev, &mr_table->mtpt_table, mtpt_idx);
+	if (ret)
+		return ret;
+
+	mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
+	if (IS_ERR(mailbox)) {
+		ret = PTR_ERR(mailbox);
+		goto err_table;
+	}
+
+	ret = hr_dev->hw->mw_write_mtpt(mailbox->buf, mw);
+	if (ret) {
+		dev_err(dev, "MW write mtpt fail!\n");
+		goto err_page;
+	}
+
+	ret = hns_roce_create_hw_ctx(hr_dev, mailbox, HNS_ROCE_CMD_CREATE_MPT,
+				     mtpt_idx & (hr_dev->caps.num_mtpts - 1));
+	if (ret) {
+		dev_err(dev, "MW CREATE_MPT failed (%d)\n", ret);
+		goto err_page;
+	}
+
+	mw->enabled = 1;
+
+	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
+
+	return 0;
+
+err_page:
+	hns_roce_free_cmd_mailbox(hr_dev, mailbox);
+
+err_table:
+	hns_roce_table_put(hr_dev, &mr_table->mtpt_table, mtpt_idx);
+
+	return ret;
+}
+
+int hns_roce_alloc_mw(struct ib_mw *ibmw, struct ib_udata *udata)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(ibmw->device);
+	struct hns_roce_ida *mtpt_ida = &hr_dev->mr_table.mtpt_ida;
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	struct hns_roce_mw *mw = to_hr_mw(ibmw);
+	int ret;
+	int id;
+
+	/* Allocate a key for mw from mr_table */
+	id = ida_alloc_range(&mtpt_ida->ida, mtpt_ida->min, mtpt_ida->max,
+			     GFP_KERNEL);
+	if (id < 0) {
+		ibdev_err(ibdev, "failed to alloc id for MW key, id(%d)\n", id);
+		return -ENOMEM;
+	}
+
+	mw->rkey = hw_index_to_key(id);
+
+	ibmw->rkey = mw->rkey;
+	mw->pdn = to_hr_pd(ibmw->pd)->pdn;
+	mw->pbl_hop_num = hr_dev->caps.pbl_hop_num;
+	mw->pbl_ba_pg_sz = hr_dev->caps.pbl_ba_pg_sz;
+	mw->pbl_buf_pg_sz = hr_dev->caps.pbl_buf_pg_sz;
+
+	ret = hns_roce_mw_enable(hr_dev, mw);
+	if (ret)
+		goto err_mw;
+
+	return 0;
+
+err_mw:
+	hns_roce_mw_free(hr_dev, mw);
+	return ret;
+}
+
+int hns_roce_dealloc_mw(struct ib_mw *ibmw)
+{
+	struct hns_roce_dev *hr_dev = to_hr_dev(ibmw->device);
+	struct hns_roce_mw *mw = to_hr_mw(ibmw);
+
+	hns_roce_mw_free(hr_dev, mw);
+	return 0;
+}
+
+static int mtr_map_region(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
+			  struct hns_roce_buf_region *region, dma_addr_t *pages,
+			  int max_count)
+{
+	int count, npage;
+	int offset, end;
+	__le64 *mtts;
+	u64 addr;
+	int i;
+
+	offset = region->offset;
+	end = offset + region->count;
+	npage = 0;
+	while (offset < end && npage < max_count) {
+		count = 0;
+		mtts = hns_roce_hem_list_find_mtt(hr_dev, &mtr->hem_list,
+						  offset, &count);
+		if (!mtts)
+			return -ENOBUFS;
+
+		for (i = 0; i < count && npage < max_count; i++) {
+			addr = pages[npage];
+
+			mtts[i] = cpu_to_le64(addr);
+			npage++;
+		}
+		offset += count;
+	}
+
+	return npage;
+}
+
+static inline bool mtr_has_mtt(struct hns_roce_buf_attr *attr)
+{
+	int i;
+
+	for (i = 0; i < attr->region_count; i++)
+		if (attr->region[i].hopnum != HNS_ROCE_HOP_NUM_0 &&
+		    attr->region[i].hopnum > 0)
+			return true;
+
+	/* because the mtr only one root base address, when hopnum is 0 means
+	 * root base address equals the first buffer address, thus all alloced
+	 * memory must in a continuous space accessed by direct mode.
+	 */
+	return false;
+}
+
+static inline size_t mtr_bufs_size(struct hns_roce_buf_attr *attr)
+{
+	size_t size = 0;
+	int i;
+
+	for (i = 0; i < attr->region_count; i++)
+		size += attr->region[i].size;
+
+	return size;
+}
+
+/*
+ * check the given pages in continuous address space
+ * Returns 0 on success, or the error page num.
+ */
+static inline int mtr_check_direct_pages(dma_addr_t *pages, int page_count,
+					 unsigned int page_shift)
+{
+	size_t page_size = 1 << page_shift;
+	int i;
+
+	for (i = 1; i < page_count; i++)
+		if (pages[i] - pages[i - 1] != page_size)
+			return i;
+
+	return 0;
+}
+
+static void mtr_free_bufs(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr)
+{
+	/* release user buffers */
+	if (mtr->umem) {
+		ib_umem_release(mtr->umem);
+		mtr->umem = NULL;
+	}
+
+	/* release kernel buffers */
+	if (mtr->kmem) {
+		hns_roce_buf_free(hr_dev, mtr->kmem);
+		mtr->kmem = NULL;
+	}
+}
+
+static int mtr_alloc_bufs(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
+			  struct hns_roce_buf_attr *buf_attr,
+			  struct ib_udata *udata, unsigned long user_addr)
+{
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	size_t total_size;
+
+	total_size = mtr_bufs_size(buf_attr);
+
+	if (udata) {
+		mtr->kmem = NULL;
+		mtr->umem = ib_umem_get(ibdev, user_addr, total_size,
+					buf_attr->user_access);
+		if (IS_ERR_OR_NULL(mtr->umem)) {
+			ibdev_err(ibdev, "failed to get umem, ret = %ld.\n",
+				  PTR_ERR(mtr->umem));
+			return -ENOMEM;
+		}
+	} else {
+		mtr->umem = NULL;
+		mtr->kmem = hns_roce_buf_alloc(hr_dev, total_size,
+					       buf_attr->page_shift,
+					       mtr->hem_cfg.is_direct ?
+					       HNS_ROCE_BUF_DIRECT : 0);
+		if (IS_ERR(mtr->kmem)) {
+			ibdev_err(ibdev, "failed to alloc kmem, ret = %ld.\n",
+				  PTR_ERR(mtr->kmem));
+			return PTR_ERR(mtr->kmem);
+		}
+	}
+
+	return 0;
+}
+
+static int mtr_map_bufs(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
+			int page_count, unsigned int page_shift)
+{
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	dma_addr_t *pages;
+	int npage;
+	int ret;
+
+	/* alloc a tmp array to store buffer's dma address */
+	pages = kvcalloc(page_count, sizeof(dma_addr_t), GFP_KERNEL);
+	if (!pages)
+		return -ENOMEM;
+
+	if (mtr->umem)
+		npage = hns_roce_get_umem_bufs(hr_dev, pages, page_count,
+					       mtr->umem, page_shift);
+	else
+		npage = hns_roce_get_kmem_bufs(hr_dev, pages, page_count,
+					       mtr->kmem, page_shift);
+
+	if (npage != page_count) {
+		ibdev_err(ibdev, "failed to get mtr page %d != %d.\n", npage,
+			  page_count);
+		ret = -ENOBUFS;
+		goto err_alloc_list;
+	}
+
+	if (mtr->hem_cfg.is_direct && npage > 1) {
+		ret = mtr_check_direct_pages(pages, npage, page_shift);
+		if (ret) {
+			ibdev_err(ibdev, "failed to check %s page: %d / %d.\n",
+				  mtr->umem ? "umtr" : "kmtr", ret, npage);
+			ret = -ENOBUFS;
+			goto err_alloc_list;
+		}
+	}
+
+	ret = hns_roce_mtr_map(hr_dev, mtr, pages, page_count);
+	if (ret)
+		ibdev_err(ibdev, "failed to map mtr pages, ret = %d.\n", ret);
+
+err_alloc_list:
+	kvfree(pages);
+
+	return ret;
+}
+
+int hns_roce_mtr_map(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
+		     dma_addr_t *pages, unsigned int page_cnt)
+{
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	struct hns_roce_buf_region *r;
+	unsigned int i, mapped_cnt;
+	int ret = 0;
+
+	/*
+	 * Only use the first page address as root ba when hopnum is 0, this
+	 * is because the addresses of all pages are consecutive in this case.
+	 */
+	if (mtr->hem_cfg.is_direct) {
+		mtr->hem_cfg.root_ba = pages[0];
+		return 0;
+	}
+
+	for (i = 0, mapped_cnt = 0; i < mtr->hem_cfg.region_count &&
+	     mapped_cnt < page_cnt; i++) {
+		r = &mtr->hem_cfg.region[i];
+		/* if hopnum is 0, no need to map pages in this region */
+		if (!r->hopnum) {
+			mapped_cnt += r->count;
+			continue;
+		}
+
+		if (r->offset + r->count > page_cnt) {
+			ret = -EINVAL;
+			ibdev_err(ibdev,
+				  "failed to check mtr%u count %u + %u > %u.\n",
+				  i, r->offset, r->count, page_cnt);
+			return ret;
+		}
+
+		ret = mtr_map_region(hr_dev, mtr, r, &pages[r->offset],
+				     page_cnt - mapped_cnt);
+		if (ret < 0) {
+			ibdev_err(ibdev,
+				  "failed to map mtr%u offset %u, ret = %d.\n",
+				  i, r->offset, ret);
+			return ret;
+		}
+		mapped_cnt += ret;
+		ret = 0;
+	}
+
+	if (mapped_cnt < page_cnt) {
+		ret = -ENOBUFS;
+		ibdev_err(ibdev, "failed to map mtr pages count: %u < %u.\n",
+			  mapped_cnt, page_cnt);
+	}
+
+	return ret;
+}
+
+int hns_roce_mtr_find(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
+		      u32 offset, u64 *mtt_buf, int mtt_max, u64 *base_addr)
+{
+	struct hns_roce_hem_cfg *cfg = &mtr->hem_cfg;
+	int mtt_count, left;
+	u32 start_index;
+	int total = 0;
+	__le64 *mtts;
+	u32 npage;
+	u64 addr;
+
+	if (!mtt_buf || mtt_max < 1)
+		goto done;
+
+	/* no mtt memory in direct mode, so just return the buffer address */
+	if (cfg->is_direct) {
+		start_index = offset >> HNS_HW_PAGE_SHIFT;
+		for (mtt_count = 0; mtt_count < cfg->region_count &&
+		     total < mtt_max; mtt_count++) {
+			npage = cfg->region[mtt_count].offset;
+			if (npage < start_index)
+				continue;
+
+			addr = cfg->root_ba + (npage << HNS_HW_PAGE_SHIFT);
+			mtt_buf[total] = addr;
+
+			total++;
+		}
+
+		goto done;
+	}
+
+	start_index = offset >> cfg->buf_pg_shift;
+	left = mtt_max;
+	while (left > 0) {
+		mtt_count = 0;
+		mtts = hns_roce_hem_list_find_mtt(hr_dev, &mtr->hem_list,
+						  start_index + total,
+						  &mtt_count);
+		if (!mtts || !mtt_count)
+			goto done;
+
+		npage = min(mtt_count, left);
+		left -= npage;
+		for (mtt_count = 0; mtt_count < npage; mtt_count++)
+			mtt_buf[total++] = le64_to_cpu(mtts[mtt_count]);
+	}
+
+done:
+	if (base_addr)
+		*base_addr = cfg->root_ba;
+
+	return total;
+}
+
+static int mtr_init_buf_cfg(struct hns_roce_dev *hr_dev,
+			    struct hns_roce_buf_attr *attr,
+			    struct hns_roce_hem_cfg *cfg,
+			    unsigned int *buf_page_shift, u64 unalinged_size)
+{
+	struct hns_roce_buf_region *r;
+	u64 first_region_padding;
+	int page_cnt, region_cnt;
+	unsigned int page_shift;
+	size_t buf_size;
+
+	/* If mtt is disabled, all pages must be within a continuous range */
+	cfg->is_direct = !mtr_has_mtt(attr);
+	buf_size = mtr_bufs_size(attr);
+	if (cfg->is_direct) {
+		/* When HEM buffer uses 0-level addressing, the page size is
+		 * equal to the whole buffer size, and we split the buffer into
+		 * small pages which is used to check whether the adjacent
+		 * units are in the continuous space and its size is fixed to
+		 * 4K based on hns ROCEE's requirement.
+		 */
+		page_shift = HNS_HW_PAGE_SHIFT;
+
+		/* The ROCEE requires the page size to be 4K * 2 ^ N. */
+		cfg->buf_pg_count = 1;
+		cfg->buf_pg_shift = HNS_HW_PAGE_SHIFT +
+			order_base_2(DIV_ROUND_UP(buf_size, HNS_HW_PAGE_SIZE));
+		first_region_padding = 0;
+	} else {
+		page_shift = attr->page_shift;
+		cfg->buf_pg_count = DIV_ROUND_UP(buf_size + unalinged_size,
+						 1 << page_shift);
+		cfg->buf_pg_shift = page_shift;
+		first_region_padding = unalinged_size;
+	}
+
+	/* Convert buffer size to page index and page count for each region and
+	 * the buffer's offset needs to be appended to the first region.
+	 */
+	for (page_cnt = 0, region_cnt = 0; region_cnt < attr->region_count &&
+	     region_cnt < ARRAY_SIZE(cfg->region); region_cnt++) {
+		r = &cfg->region[region_cnt];
+		r->offset = page_cnt;
+		buf_size = hr_hw_page_align(attr->region[region_cnt].size +
+					    first_region_padding);
+		r->count = DIV_ROUND_UP(buf_size, 1 << page_shift);
+		first_region_padding = 0;
+		page_cnt += r->count;
+		r->hopnum = to_hr_hem_hopnum(attr->region[region_cnt].hopnum,
+					     r->count);
+	}
+
+	cfg->region_count = region_cnt;
+	*buf_page_shift = page_shift;
+
+	return page_cnt;
+}
+
+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)
+{
+	struct hns_roce_hem_cfg *cfg = &mtr->hem_cfg;
+	int ret;
+
+	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);
+		if (ret)
+			return ret;
+		cfg->root_ba = mtr->hem_list.root_ba;
+		cfg->ba_pg_shift = ba_page_shift;
+	} else {
+		cfg->ba_pg_shift = cfg->buf_pg_shift;
+	}
+
+	return 0;
+}
+
+static void mtr_free_mtt(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr)
+{
+	hns_roce_hem_list_release(hr_dev, &mtr->hem_list);
+}
+
+/**
+ * hns_roce_mtr_create - Create hns memory translate region.
+ *
+ * @hr_dev: RoCE device struct pointer
+ * @mtr: memory translate region
+ * @buf_attr: buffer attribute for creating mtr
+ * @ba_page_shift: page shift for multi-hop base address table
+ * @udata: user space context, if it's NULL, means kernel space
+ * @user_addr: userspace virtual address to start at
+ */
+int hns_roce_mtr_create(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr,
+			struct hns_roce_buf_attr *buf_attr,
+			unsigned int ba_page_shift, struct ib_udata *udata,
+			unsigned long user_addr)
+{
+	struct ib_device *ibdev = &hr_dev->ib_dev;
+	unsigned int buf_page_shift = 0;
+	int buf_page_cnt;
+	int ret;
+
+	buf_page_cnt = mtr_init_buf_cfg(hr_dev, buf_attr, &mtr->hem_cfg,
+					&buf_page_shift,
+					udata ? user_addr & ~PAGE_MASK : 0);
+	if (buf_page_cnt < 1 || buf_page_shift < HNS_HW_PAGE_SHIFT) {
+		ibdev_err(ibdev, "failed to init mtr cfg, count %d shift %u.\n",
+			  buf_page_cnt, buf_page_shift);
+		return -EINVAL;
+	}
+
+	ret = mtr_alloc_mtt(hr_dev, mtr, ba_page_shift);
+	if (ret) {
+		ibdev_err(ibdev, "failed to alloc mtr mtt, ret = %d.\n", ret);
+		return ret;
+	}
+
+	/* The caller has its own buffer list and invokes the hns_roce_mtr_map()
+	 * to finish the MTT configuration.
+	 */
+	if (buf_attr->mtt_only) {
+		mtr->umem = NULL;
+		mtr->kmem = NULL;
+		return 0;
+	}
+
+	ret = mtr_alloc_bufs(hr_dev, mtr, buf_attr, udata, user_addr);
+	if (ret) {
+		ibdev_err(ibdev, "failed to alloc mtr bufs, ret = %d.\n", ret);
+		goto err_alloc_mtt;
+	}
+
+	/* Write buffer's dma address to MTT */
+	ret = mtr_map_bufs(hr_dev, mtr, buf_page_cnt, buf_page_shift);
+	if (ret)
+		ibdev_err(ibdev, "failed to map mtr bufs, ret = %d.\n", ret);
+	else
+		return 0;
+
+	mtr_free_bufs(hr_dev, mtr);
+err_alloc_mtt:
+	mtr_free_mtt(hr_dev, mtr);
+	return ret;
+}
+
+void hns_roce_mtr_destroy(struct hns_roce_dev *hr_dev, struct hns_roce_mtr *mtr)
+{
+	/* release multi-hop addressing resource */
+	hns_roce_hem_list_release(hr_dev, &mtr->hem_list);
+
+	/* free buffers */
+	mtr_free_bufs(hr_dev, mtr);
+}