/*
 * 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/platform_device.h>
#include <linux/vmalloc.h>
#include <rdma/ib_umem.h>
#include "hns_roce_device.h"
#include "hns_roce_cmd.h"
#include "hns_roce_hem.h"

static u32 hw_index_to_key(unsigned long ind)
{
	return (u32)(ind >> 24) | (ind << 8);
}

unsigned long key_to_hw_index(u32 key)
{
	return (key << 24) | (key >> 8);
}
EXPORT_SYMBOL_GPL(key_to_hw_index);

static int hns_roce_sw2hw_mpt(struct hns_roce_dev *hr_dev,
			      struct hns_roce_cmd_mailbox *mailbox,
			      unsigned long mpt_index)
{
	return hns_roce_cmd_mbox(hr_dev, mailbox->dma, 0, mpt_index, 0,
				 HNS_ROCE_CMD_SW2HW_MPT,
				 HNS_ROCE_CMD_TIMEOUT_MSECS);
}

int hns_roce_hw2sw_mpt(struct hns_roce_dev *hr_dev,
			      struct hns_roce_cmd_mailbox *mailbox,
			      unsigned long mpt_index)
{
	return hns_roce_cmd_mbox(hr_dev, 0, mailbox ? mailbox->dma : 0,
				 mpt_index, !mailbox, HNS_ROCE_CMD_HW2SW_MPT,
				 HNS_ROCE_CMD_TIMEOUT_MSECS);
}
EXPORT_SYMBOL_GPL(hns_roce_hw2sw_mpt);

static int hns_roce_buddy_alloc(struct hns_roce_buddy *buddy, int order,
				unsigned long *seg)
{
	int o;
	u32 m;

	spin_lock(&buddy->lock);

	for (o = order; o <= buddy->max_order; ++o) {
		if (buddy->num_free[o]) {
			m = 1 << (buddy->max_order - o);
			*seg = find_first_bit(buddy->bits[o], m);
			if (*seg < m)
				goto found;
		}
	}
	spin_unlock(&buddy->lock);
	return -1;

 found:
	clear_bit(*seg, buddy->bits[o]);
	--buddy->num_free[o];

	while (o > order) {
		--o;
		*seg <<= 1;
		set_bit(*seg ^ 1, buddy->bits[o]);
		++buddy->num_free[o];
	}

	spin_unlock(&buddy->lock);

	*seg <<= order;
	return 0;
}

static void hns_roce_buddy_free(struct hns_roce_buddy *buddy, unsigned long seg,
				int order)
{
	seg >>= order;

	spin_lock(&buddy->lock);

	while (test_bit(seg ^ 1, buddy->bits[order])) {
		clear_bit(seg ^ 1, buddy->bits[order]);
		--buddy->num_free[order];
		seg >>= 1;
		++order;
	}

	set_bit(seg, buddy->bits[order]);
	++buddy->num_free[order];

	spin_unlock(&buddy->lock);
}

static int hns_roce_buddy_init(struct hns_roce_buddy *buddy, int max_order)
{
	int i, s;

	buddy->max_order = max_order;
	spin_lock_init(&buddy->lock);
	buddy->bits = kcalloc(buddy->max_order + 1,
			      sizeof(*buddy->bits),
			      GFP_KERNEL);
	buddy->num_free = kcalloc(buddy->max_order + 1,
				  sizeof(*buddy->num_free),
				  GFP_KERNEL);
	if (!buddy->bits || !buddy->num_free)
		goto err_out;

	for (i = 0; i <= buddy->max_order; ++i) {
		s = BITS_TO_LONGS(1 << (buddy->max_order - i));
		buddy->bits[i] = kcalloc(s, sizeof(long), GFP_KERNEL |
					 __GFP_NOWARN);
		if (!buddy->bits[i]) {
			buddy->bits[i] = vzalloc(s * sizeof(long));
			if (!buddy->bits[i])
				goto err_out_free;
		}
	}

	set_bit(0, buddy->bits[buddy->max_order]);
	buddy->num_free[buddy->max_order] = 1;

	return 0;

err_out_free:
	for (i = 0; i <= buddy->max_order; ++i)
		kvfree(buddy->bits[i]);

err_out:
	kfree(buddy->bits);
	kfree(buddy->num_free);
	return -ENOMEM;
}

static void hns_roce_buddy_cleanup(struct hns_roce_buddy *buddy)
{
	int i;

	for (i = 0; i <= buddy->max_order; ++i)
		kvfree(buddy->bits[i]);

	kfree(buddy->bits);
	kfree(buddy->num_free);
}

static int hns_roce_alloc_mtt_range(struct hns_roce_dev *hr_dev, int order,
				    unsigned long *seg, u32 mtt_type)
{
	struct hns_roce_mr_table *mr_table = &hr_dev->mr_table;
	struct hns_roce_hem_table *table;
	struct hns_roce_buddy *buddy;
	int ret;

	if (mtt_type == MTT_TYPE_WQE) {
		buddy = &mr_table->mtt_buddy;
		table = &mr_table->mtt_table;
	} else {
		buddy = &mr_table->mtt_cqe_buddy;
		table = &mr_table->mtt_cqe_table;
	}

	ret = hns_roce_buddy_alloc(buddy, order, seg);
	if (ret == -1)
		return -1;

	if (hns_roce_table_get_range(hr_dev, table, *seg,
				     *seg + (1 << order) - 1)) {
		hns_roce_buddy_free(buddy, *seg, order);
		return -1;
	}

	return 0;
}

int hns_roce_mtt_init(struct hns_roce_dev *hr_dev, int npages, int page_shift,
		      struct hns_roce_mtt *mtt)
{
	int ret;
	int i;

	/* Page num is zero, correspond to DMA memory register */
	if (!npages) {
		mtt->order = -1;
		mtt->page_shift = HNS_ROCE_HEM_PAGE_SHIFT;
		return 0;
	}

	/* Note: if page_shift is zero, FAST memory register */
	mtt->page_shift = page_shift;

	/* Compute MTT entry necessary */
	for (mtt->order = 0, i = HNS_ROCE_MTT_ENTRY_PER_SEG; i < npages;
	     i <<= 1)
		++mtt->order;

	/* Allocate MTT entry */
	ret = hns_roce_alloc_mtt_range(hr_dev, mtt->order, &mtt->first_seg,
				       mtt->mtt_type);
	if (ret == -1)
		return -ENOMEM;

	return 0;
}

void hns_roce_mtt_cleanup(struct hns_roce_dev *hr_dev, struct hns_roce_mtt *mtt)
{
	struct hns_roce_mr_table *mr_table = &hr_dev->mr_table;

	if (mtt->order < 0)
		return;

	if (mtt->mtt_type == MTT_TYPE_WQE) {
		hns_roce_buddy_free(&mr_table->mtt_buddy, mtt->first_seg,
				    mtt->order);
		hns_roce_table_put_range(hr_dev, &mr_table->mtt_table,
					mtt->first_seg,
					mtt->first_seg + (1 << mtt->order) - 1);
	} else {
		hns_roce_buddy_free(&mr_table->mtt_cqe_buddy, mtt->first_seg,
				    mtt->order);
		hns_roce_table_put_range(hr_dev, &mr_table->mtt_cqe_table,
					mtt->first_seg,
					mtt->first_seg + (1 << mtt->order) - 1);
	}
}
EXPORT_SYMBOL_GPL(hns_roce_mtt_cleanup);

static void hns_roce_loop_free(struct hns_roce_dev *hr_dev,
			       struct hns_roce_mr *mr, int err_loop_index,
			       int loop_i, int loop_j)
{
	struct device *dev = hr_dev->dev;
	u32 mhop_num;
	u32 pbl_bt_sz;
	u64 bt_idx;
	int i, j;

	pbl_bt_sz = 1 << (hr_dev->caps.pbl_ba_pg_sz + PAGE_SHIFT);
	mhop_num = hr_dev->caps.pbl_hop_num;

	i = loop_i;
	j = loop_j;
	if (mhop_num == 3 && err_loop_index == 2) {
		for (; i >= 0; i--) {
			dma_free_coherent(dev, pbl_bt_sz, mr->pbl_bt_l1[i],
					  mr->pbl_l1_dma_addr[i]);

			for (j = 0; j < pbl_bt_sz / 8; j++) {
				if (i == loop_i && j >= loop_j)
					break;

				bt_idx = i * pbl_bt_sz / 8 + j;
				dma_free_coherent(dev, pbl_bt_sz,
						  mr->pbl_bt_l2[bt_idx],
						  mr->pbl_l2_dma_addr[bt_idx]);
			}
		}
	} else if (mhop_num == 3 && err_loop_index == 1) {
		for (i -= 1; i >= 0; i--) {
			dma_free_coherent(dev, pbl_bt_sz, mr->pbl_bt_l1[i],
					  mr->pbl_l1_dma_addr[i]);

			for (j = 0; j < pbl_bt_sz / 8; j++) {
				bt_idx = i * pbl_bt_sz / 8 + j;
				dma_free_coherent(dev, pbl_bt_sz,
						  mr->pbl_bt_l2[bt_idx],
						  mr->pbl_l2_dma_addr[bt_idx]);
			}
		}
	} else if (mhop_num == 2 && err_loop_index == 1) {
		for (i -= 1; i >= 0; i--)
			dma_free_coherent(dev, pbl_bt_sz, mr->pbl_bt_l1[i],
					  mr->pbl_l1_dma_addr[i]);
	} else {
		dev_warn(dev, "not support: mhop_num=%d, err_loop_index=%d.",
			 mhop_num, err_loop_index);
		return;
	}

	dma_free_coherent(dev, pbl_bt_sz, mr->pbl_bt_l0, mr->pbl_l0_dma_addr);
	mr->pbl_bt_l0 = NULL;
	mr->pbl_l0_dma_addr = 0;
}

/* PBL multi hop addressing */
static int hns_roce_mhop_alloc(struct hns_roce_dev *hr_dev, int npages,
			       struct hns_roce_mr *mr)
{
	struct device *dev = hr_dev->dev;
	int mr_alloc_done = 0;
	int npages_allocated;
	int i = 0, j = 0;
	u32 pbl_bt_sz;
	u32 mhop_num;
	u64 pbl_last_bt_num;
	u64 pbl_bt_cnt = 0;
	u64 bt_idx;
	u64 size;

	mhop_num = hr_dev->caps.pbl_hop_num;
	pbl_bt_sz = 1 << (hr_dev->caps.pbl_ba_pg_sz + PAGE_SHIFT);
	pbl_last_bt_num = (npages + pbl_bt_sz / 8 - 1) / (pbl_bt_sz / 8);

	if (mhop_num == HNS_ROCE_HOP_NUM_0)
		return 0;

	/* hop_num = 1 */
	if (mhop_num == 1) {
		if (npages > pbl_bt_sz / 8) {
			dev_err(dev, "npages %d is larger than buf_pg_sz!",
				npages);
			return -EINVAL;
		}
		mr->pbl_buf = dma_alloc_coherent(dev, npages * 8,
						 &(mr->pbl_dma_addr),
						 GFP_KERNEL);
		if (!mr->pbl_buf)
			return -ENOMEM;

		mr->pbl_size = npages;
		mr->pbl_ba = mr->pbl_dma_addr;
		mr->pbl_hop_num = hr_dev->caps.pbl_hop_num;
		mr->pbl_ba_pg_sz = hr_dev->caps.pbl_ba_pg_sz;
		mr->pbl_buf_pg_sz = hr_dev->caps.pbl_buf_pg_sz;
		return 0;
	}

	mr->pbl_l1_dma_addr = kcalloc(pbl_bt_sz / 8,
				      sizeof(*mr->pbl_l1_dma_addr),
				      GFP_KERNEL);
	if (!mr->pbl_l1_dma_addr)
		return -ENOMEM;

	mr->pbl_bt_l1 = kcalloc(pbl_bt_sz / 8, sizeof(*mr->pbl_bt_l1),
				GFP_KERNEL);
	if (!mr->pbl_bt_l1)
		goto err_kcalloc_bt_l1;

	if (mhop_num == 3) {
		mr->pbl_l2_dma_addr = kcalloc(pbl_last_bt_num,
					      sizeof(*mr->pbl_l2_dma_addr),
					      GFP_KERNEL);
		if (!mr->pbl_l2_dma_addr)
			goto err_kcalloc_l2_dma;

		mr->pbl_bt_l2 = kcalloc(pbl_last_bt_num,
					sizeof(*mr->pbl_bt_l2),
					GFP_KERNEL);
		if (!mr->pbl_bt_l2)
			goto err_kcalloc_bt_l2;
	}

	/* alloc L0 BT */
	mr->pbl_bt_l0 = dma_alloc_coherent(dev, pbl_bt_sz,
					   &(mr->pbl_l0_dma_addr),
					   GFP_KERNEL);
	if (!mr->pbl_bt_l0)
		goto err_dma_alloc_l0;

	if (mhop_num == 2) {
		/* alloc L1 BT */
		for (i = 0; i < pbl_bt_sz / 8; i++) {
			if (pbl_bt_cnt + 1 < pbl_last_bt_num) {
				size = pbl_bt_sz;
			} else {
				npages_allocated = i * (pbl_bt_sz / 8);
				size = (npages - npages_allocated) * 8;
			}
			mr->pbl_bt_l1[i] = dma_alloc_coherent(dev, size,
						    &(mr->pbl_l1_dma_addr[i]),
						    GFP_KERNEL);
			if (!mr->pbl_bt_l1[i]) {
				hns_roce_loop_free(hr_dev, mr, 1, i, 0);
				goto err_dma_alloc_l0;
			}

			*(mr->pbl_bt_l0 + i) = mr->pbl_l1_dma_addr[i];

			pbl_bt_cnt++;
			if (pbl_bt_cnt >= pbl_last_bt_num)
				break;
		}
	} else if (mhop_num == 3) {
		/* alloc L1, L2 BT */
		for (i = 0; i < pbl_bt_sz / 8; i++) {
			mr->pbl_bt_l1[i] = dma_alloc_coherent(dev, pbl_bt_sz,
						    &(mr->pbl_l1_dma_addr[i]),
						    GFP_KERNEL);
			if (!mr->pbl_bt_l1[i]) {
				hns_roce_loop_free(hr_dev, mr, 1, i, 0);
				goto err_dma_alloc_l0;
			}

			*(mr->pbl_bt_l0 + i) = mr->pbl_l1_dma_addr[i];

			for (j = 0; j < pbl_bt_sz / 8; j++) {
				bt_idx = i * pbl_bt_sz / 8 + j;

				if (pbl_bt_cnt + 1 < pbl_last_bt_num) {
					size = pbl_bt_sz;
				} else {
					npages_allocated = bt_idx *
							   (pbl_bt_sz / 8);
					size = (npages - npages_allocated) * 8;
				}
				mr->pbl_bt_l2[bt_idx] = dma_alloc_coherent(
					      dev, size,
					      &(mr->pbl_l2_dma_addr[bt_idx]),
					      GFP_KERNEL);
				if (!mr->pbl_bt_l2[bt_idx]) {
					hns_roce_loop_free(hr_dev, mr, 2, i, j);
					goto err_dma_alloc_l0;
				}

				*(mr->pbl_bt_l1[i] + j) =
						mr->pbl_l2_dma_addr[bt_idx];

				pbl_bt_cnt++;
				if (pbl_bt_cnt >= pbl_last_bt_num) {
					mr_alloc_done = 1;
					break;
				}
			}

			if (mr_alloc_done)
				break;
		}
	}

	mr->l0_chunk_last_num = i + 1;
	if (mhop_num == 3)
		mr->l1_chunk_last_num = j + 1;

	mr->pbl_size = npages;
	mr->pbl_ba = mr->pbl_l0_dma_addr;
	mr->pbl_hop_num = hr_dev->caps.pbl_hop_num;
	mr->pbl_ba_pg_sz = hr_dev->caps.pbl_ba_pg_sz;
	mr->pbl_buf_pg_sz = hr_dev->caps.pbl_buf_pg_sz;

	return 0;

err_dma_alloc_l0:
	kfree(mr->pbl_bt_l2);
	mr->pbl_bt_l2 = NULL;

err_kcalloc_bt_l2:
	kfree(mr->pbl_l2_dma_addr);
	mr->pbl_l2_dma_addr = NULL;

err_kcalloc_l2_dma:
	kfree(mr->pbl_bt_l1);
	mr->pbl_bt_l1 = NULL;

err_kcalloc_bt_l1:
	kfree(mr->pbl_l1_dma_addr);
	mr->pbl_l1_dma_addr = NULL;

	return -ENOMEM;
}

static int hns_roce_mr_alloc(struct hns_roce_dev *hr_dev, u32 pd, u64 iova,
			     u64 size, u32 access, int npages,
			     struct hns_roce_mr *mr)
{
	struct device *dev = hr_dev->dev;
	unsigned long index = 0;
	int ret = 0;

	/* Allocate a key for mr from mr_table */
	ret = hns_roce_bitmap_alloc(&hr_dev->mr_table.mtpt_bitmap, &index);
	if (ret == -1)
		return -ENOMEM;

	mr->iova = iova;			/* MR va starting addr */
	mr->size = size;			/* MR addr range */
	mr->pd = pd;				/* MR num */
	mr->access = access;			/* MR access permit */
	mr->enabled = 0;			/* MR active status */
	mr->key = hw_index_to_key(index);	/* MR key */

	if (size == ~0ull) {
		mr->type = MR_TYPE_DMA;
		mr->pbl_buf = NULL;
		mr->pbl_dma_addr = 0;
		/* PBL multi-hop addressing parameters */
		mr->pbl_bt_l2 = NULL;
		mr->pbl_bt_l1 = NULL;
		mr->pbl_bt_l0 = NULL;
		mr->pbl_l2_dma_addr = NULL;
		mr->pbl_l1_dma_addr = NULL;
		mr->pbl_l0_dma_addr = 0;
	} else {
		mr->type = MR_TYPE_MR;
		if (!hr_dev->caps.pbl_hop_num) {
			mr->pbl_buf = dma_alloc_coherent(dev, npages * 8,
							 &(mr->pbl_dma_addr),
							 GFP_KERNEL);
			if (!mr->pbl_buf)
				return -ENOMEM;
		} else {
			ret = hns_roce_mhop_alloc(hr_dev, npages, mr);
		}
	}

	return ret;
}

static void hns_roce_mhop_free(struct hns_roce_dev *hr_dev,
			       struct hns_roce_mr *mr)
{
	struct device *dev = hr_dev->dev;
	int npages_allocated;
	int npages;
	int i, j;
	u32 pbl_bt_sz;
	u32 mhop_num;
	u64 bt_idx;

	npages = ib_umem_page_count(mr->umem);
	pbl_bt_sz = 1 << (hr_dev->caps.pbl_ba_pg_sz + PAGE_SHIFT);
	mhop_num = hr_dev->caps.pbl_hop_num;

	if (mhop_num == HNS_ROCE_HOP_NUM_0)
		return;

	/* hop_num = 1 */
	if (mhop_num == 1) {
		dma_free_coherent(dev, (unsigned int)(npages * 8),
				  mr->pbl_buf, mr->pbl_dma_addr);
		return;
	}

	dma_free_coherent(dev, pbl_bt_sz, mr->pbl_bt_l0,
			  mr->pbl_l0_dma_addr);

	if (mhop_num == 2) {
		for (i = 0; i < mr->l0_chunk_last_num; i++) {
			if (i == mr->l0_chunk_last_num - 1) {
				npages_allocated = i * (pbl_bt_sz / 8);

				dma_free_coherent(dev,
					      (npages - npages_allocated) * 8,
					      mr->pbl_bt_l1[i],
					      mr->pbl_l1_dma_addr[i]);

				break;
			}

			dma_free_coherent(dev, pbl_bt_sz, mr->pbl_bt_l1[i],
					  mr->pbl_l1_dma_addr[i]);
		}
	} else if (mhop_num == 3) {
		for (i = 0; i < mr->l0_chunk_last_num; i++) {
			dma_free_coherent(dev, pbl_bt_sz, mr->pbl_bt_l1[i],
					  mr->pbl_l1_dma_addr[i]);

			for (j = 0; j < pbl_bt_sz / 8; j++) {
				bt_idx = i * (pbl_bt_sz / 8) + j;

				if ((i == mr->l0_chunk_last_num - 1)
				    && j == mr->l1_chunk_last_num - 1) {
					npages_allocated = bt_idx *
							   (pbl_bt_sz / 8);

					dma_free_coherent(dev,
					      (npages - npages_allocated) * 8,
					      mr->pbl_bt_l2[bt_idx],
					      mr->pbl_l2_dma_addr[bt_idx]);

					break;
				}

				dma_free_coherent(dev, pbl_bt_sz,
						mr->pbl_bt_l2[bt_idx],
						mr->pbl_l2_dma_addr[bt_idx]);
			}
		}
	}

	kfree(mr->pbl_bt_l1);
	kfree(mr->pbl_l1_dma_addr);
	mr->pbl_bt_l1 = NULL;
	mr->pbl_l1_dma_addr = NULL;
	if (mhop_num == 3) {
		kfree(mr->pbl_bt_l2);
		kfree(mr->pbl_l2_dma_addr);
		mr->pbl_bt_l2 = NULL;
		mr->pbl_l2_dma_addr = NULL;
	}
}

static void hns_roce_mr_free(struct hns_roce_dev *hr_dev,
			     struct hns_roce_mr *mr)
{
	struct device *dev = hr_dev->dev;
	int npages = 0;
	int ret;

	if (mr->enabled) {
		ret = hns_roce_hw2sw_mpt(hr_dev, NULL, key_to_hw_index(mr->key)
					 & (hr_dev->caps.num_mtpts - 1));
		if (ret)
			dev_warn(dev, "HW2SW_MPT failed (%d)\n", ret);
	}

	if (mr->size != ~0ULL) {
		npages = ib_umem_page_count(mr->umem);

		if (!hr_dev->caps.pbl_hop_num)
			dma_free_coherent(dev, (unsigned int)(npages * 8),
					  mr->pbl_buf, mr->pbl_dma_addr);
		else
			hns_roce_mhop_free(hr_dev, mr);
	}

	if (mr->enabled)
		hns_roce_table_put(hr_dev, &hr_dev->mr_table.mtpt_table,
				   key_to_hw_index(mr->key));

	hns_roce_bitmap_free(&hr_dev->mr_table.mtpt_bitmap,
			     key_to_hw_index(mr->key), BITMAP_NO_RR);
}

static int hns_roce_mr_enable(struct hns_roce_dev *hr_dev,
			      struct hns_roce_mr *mr)
{
	int ret;
	unsigned long mtpt_idx = key_to_hw_index(mr->key);
	struct device *dev = hr_dev->dev;
	struct hns_roce_cmd_mailbox *mailbox;
	struct hns_roce_mr_table *mr_table = &hr_dev->mr_table;

	/* Prepare HEM entry memory */
	ret = hns_roce_table_get(hr_dev, &mr_table->mtpt_table, mtpt_idx);
	if (ret)
		return ret;

	/* Allocate mailbox memory */
	mailbox = hns_roce_alloc_cmd_mailbox(hr_dev);
	if (IS_ERR(mailbox)) {
		ret = PTR_ERR(mailbox);
		goto err_table;
	}

	ret = hr_dev->hw->write_mtpt(mailbox->buf, mr, mtpt_idx);
	if (ret) {
		dev_err(dev, "Write mtpt fail!\n");
		goto err_page;
	}

	ret = hns_roce_sw2hw_mpt(hr_dev, mailbox,
				 mtpt_idx & (hr_dev->caps.num_mtpts - 1));
	if (ret) {
		dev_err(dev, "SW2HW_MPT failed (%d)\n", ret);
		goto err_page;
	}

	mr->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;
}

static int hns_roce_write_mtt_chunk(struct hns_roce_dev *hr_dev,
				    struct hns_roce_mtt *mtt, u32 start_index,
				    u32 npages, u64 *page_list)
{
	struct hns_roce_hem_table *table;
	dma_addr_t dma_handle;
	__le64 *mtts;
	u32 s = start_index * sizeof(u64);
	u32 i;

	/* All MTTs must fit in the same page */
	if (start_index / (PAGE_SIZE / sizeof(u64)) !=
		(start_index + npages - 1) / (PAGE_SIZE / sizeof(u64)))
		return -EINVAL;

	if (start_index & (HNS_ROCE_MTT_ENTRY_PER_SEG - 1))
		return -EINVAL;

	if (mtt->mtt_type == MTT_TYPE_WQE)
		table = &hr_dev->mr_table.mtt_table;
	else
		table = &hr_dev->mr_table.mtt_cqe_table;

	mtts = hns_roce_table_find(hr_dev, table,
				mtt->first_seg + s / hr_dev->caps.mtt_entry_sz,
				&dma_handle);
	if (!mtts)
		return -ENOMEM;

	/* Save page addr, low 12 bits : 0 */
	for (i = 0; i < npages; ++i) {
		if (!hr_dev->caps.mtt_hop_num)
			mtts[i] = cpu_to_le64(page_list[i] >> PAGE_ADDR_SHIFT);
		else
			mtts[i] = cpu_to_le64(page_list[i]);
	}

	return 0;
}

static int hns_roce_write_mtt(struct hns_roce_dev *hr_dev,
			      struct hns_roce_mtt *mtt, u32 start_index,
			      u32 npages, u64 *page_list)
{
	int chunk;
	int ret;

	if (mtt->order < 0)
		return -EINVAL;

	while (npages > 0) {
		chunk = min_t(int, PAGE_SIZE / sizeof(u64), npages);

		ret = hns_roce_write_mtt_chunk(hr_dev, mtt, start_index, chunk,
					       page_list);
		if (ret)
			return ret;

		npages -= chunk;
		start_index += chunk;
		page_list += chunk;
	}

	return 0;
}

int hns_roce_buf_write_mtt(struct hns_roce_dev *hr_dev,
			   struct hns_roce_mtt *mtt, struct hns_roce_buf *buf)
{
	u64 *page_list;
	int ret;
	u32 i;

	page_list = kmalloc_array(buf->npages, sizeof(*page_list), GFP_KERNEL);
	if (!page_list)
		return -ENOMEM;

	for (i = 0; i < buf->npages; ++i) {
		if (buf->nbufs == 1)
			page_list[i] = buf->direct.map + (i << buf->page_shift);
		else
			page_list[i] = buf->page_list[i].map;

	}
	ret = hns_roce_write_mtt(hr_dev, mtt, 0, buf->npages, page_list);

	kfree(page_list);

	return ret;
}

int hns_roce_init_mr_table(struct hns_roce_dev *hr_dev)
{
	struct hns_roce_mr_table *mr_table = &hr_dev->mr_table;
	int ret;

	ret = hns_roce_bitmap_init(&mr_table->mtpt_bitmap,
				   hr_dev->caps.num_mtpts,
				   hr_dev->caps.num_mtpts - 1,
				   hr_dev->caps.reserved_mrws, 0);
	if (ret)
		return ret;

	ret = hns_roce_buddy_init(&mr_table->mtt_buddy,
				  ilog2(hr_dev->caps.num_mtt_segs));
	if (ret)
		goto err_buddy;

	if (hns_roce_check_whether_mhop(hr_dev, HEM_TYPE_CQE)) {
		ret = hns_roce_buddy_init(&mr_table->mtt_cqe_buddy,
					  ilog2(hr_dev->caps.num_cqe_segs));
		if (ret)
			goto err_buddy_cqe;
	}
	return 0;

err_buddy_cqe:
	hns_roce_buddy_cleanup(&mr_table->mtt_buddy);

err_buddy:
	hns_roce_bitmap_cleanup(&mr_table->mtpt_bitmap);
	return ret;
}

void hns_roce_cleanup_mr_table(struct hns_roce_dev *hr_dev)
{
	struct hns_roce_mr_table *mr_table = &hr_dev->mr_table;

	hns_roce_buddy_cleanup(&mr_table->mtt_buddy);
	if (hns_roce_check_whether_mhop(hr_dev, HEM_TYPE_CQE))
		hns_roce_buddy_cleanup(&mr_table->mtt_cqe_buddy);
	hns_roce_bitmap_cleanup(&mr_table->mtpt_bitmap);
}

struct ib_mr *hns_roce_get_dma_mr(struct ib_pd *pd, int acc)
{
	struct hns_roce_mr *mr;
	int ret;

	mr = kmalloc(sizeof(*mr), GFP_KERNEL);
	if (mr == NULL)
		return  ERR_PTR(-ENOMEM);

	/* Allocate memory region key */
	ret = hns_roce_mr_alloc(to_hr_dev(pd->device), to_hr_pd(pd)->pdn, 0,
				~0ULL, acc, 0, mr);
	if (ret)
		goto err_free;

	ret = hns_roce_mr_enable(to_hr_dev(pd->device), mr);
	if (ret)
		goto err_mr;

	mr->ibmr.rkey = mr->ibmr.lkey = mr->key;
	mr->umem = NULL;

	return &mr->ibmr;

err_mr:
	hns_roce_mr_free(to_hr_dev(pd->device), mr);

err_free:
	kfree(mr);
	return ERR_PTR(ret);
}

int hns_roce_ib_umem_write_mtt(struct hns_roce_dev *hr_dev,
			       struct hns_roce_mtt *mtt, struct ib_umem *umem)
{
	struct scatterlist *sg;
	int i, k, entry;
	int ret = 0;
	u64 *pages;
	u32 n;
	int len;

	pages = (u64 *) __get_free_page(GFP_KERNEL);
	if (!pages)
		return -ENOMEM;

	i = n = 0;

	for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
		len = sg_dma_len(sg) >> mtt->page_shift;
		for (k = 0; k < len; ++k) {
			pages[i++] = sg_dma_address(sg) +
				(k << umem->page_shift);
			if (i == PAGE_SIZE / sizeof(u64)) {
				ret = hns_roce_write_mtt(hr_dev, mtt, n, i,
							 pages);
				if (ret)
					goto out;
				n += i;
				i = 0;
			}
		}
	}

	if (i)
		ret = hns_roce_write_mtt(hr_dev, mtt, n, i, pages);

out:
	free_page((unsigned long) pages);
	return ret;
}

static int hns_roce_ib_umem_write_mr(struct hns_roce_dev *hr_dev,
				     struct hns_roce_mr *mr,
				     struct ib_umem *umem)
{
	struct scatterlist *sg;
	int i = 0, j = 0;
	int entry;

	if (hr_dev->caps.pbl_hop_num == HNS_ROCE_HOP_NUM_0)
		return 0;

	for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
		if (!hr_dev->caps.pbl_hop_num) {
			mr->pbl_buf[i] = ((u64)sg_dma_address(sg)) >> 12;
			i++;
		} else if (hr_dev->caps.pbl_hop_num == 1) {
			mr->pbl_buf[i] = sg_dma_address(sg);
			i++;
		} else {
			if (hr_dev->caps.pbl_hop_num == 2)
				mr->pbl_bt_l1[i][j] = sg_dma_address(sg);
			else if (hr_dev->caps.pbl_hop_num == 3)
				mr->pbl_bt_l2[i][j] = sg_dma_address(sg);

			j++;
			if (j >= (PAGE_SIZE / 8)) {
				i++;
				j = 0;
			}
		}
	}

	/* Memory barrier */
	mb();

	return 0;
}

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 device *dev = hr_dev->dev;
	struct hns_roce_mr *mr;
	int bt_size;
	int ret;
	int n;
	int i;

	mr = kmalloc(sizeof(*mr), GFP_KERNEL);
	if (!mr)
		return ERR_PTR(-ENOMEM);

	mr->umem = ib_umem_get(pd->uobject->context, start, length,
			       access_flags, 0);
	if (IS_ERR(mr->umem)) {
		ret = PTR_ERR(mr->umem);
		goto err_free;
	}

	n = ib_umem_page_count(mr->umem);
	if (mr->umem->page_shift != HNS_ROCE_HEM_PAGE_SHIFT) {
		dev_err(dev, "Just support 4K page size but is 0x%lx now!\n",
			BIT(mr->umem->page_shift));
		ret = -EINVAL;
		goto err_umem;
	}

	if (!hr_dev->caps.pbl_hop_num) {
		if (n > HNS_ROCE_MAX_MTPT_PBL_NUM) {
			dev_err(dev,
			     " MR len %lld err. MR is limited to 4G at most!\n",
			     length);
			ret = -EINVAL;
			goto err_umem;
		}
	} else {
		int pbl_size = 1;

		bt_size = (1 << PAGE_SHIFT) / 8;
		for (i = 0; i < hr_dev->caps.pbl_hop_num; i++)
			pbl_size *= bt_size;
		if (n > pbl_size) {
			dev_err(dev,
			    " MR len %lld err. MR page num is limited to %d!\n",
			    length, pbl_size);
			ret = -EINVAL;
			goto err_umem;
		}
	}

	ret = hns_roce_mr_alloc(hr_dev, to_hr_pd(pd)->pdn, virt_addr, length,
				access_flags, n, mr);
	if (ret)
		goto err_umem;

	ret = hns_roce_ib_umem_write_mr(hr_dev, mr, mr->umem);
	if (ret)
		goto err_mr;

	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:
	hns_roce_mr_free(hr_dev, mr);

err_umem:
	ib_umem_release(mr->umem);

err_free:
	kfree(mr);
	return ERR_PTR(ret);
}

int hns_roce_dereg_mr(struct ib_mr *ibmr)
{
	struct hns_roce_dev *hr_dev = to_hr_dev(ibmr->device);
	struct hns_roce_mr *mr = to_hr_mr(ibmr);
	int ret = 0;

	if (hr_dev->hw->dereg_mr) {
		ret = hr_dev->hw->dereg_mr(hr_dev, mr);
	} else {
		hns_roce_mr_free(hr_dev, mr);

		if (mr->umem)
			ib_umem_release(mr->umem);

		kfree(mr);
	}

	return ret;
}