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mthca_memfree.c

/*
 * Copyright (c) 2004, 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
 * Copyright (c) 2005 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.
 *
 * $Id$
 */

#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/sched.h>

#include <asm/page.h>

#include "mthca_memfree.h"
#include "mthca_dev.h"
#include "mthca_cmd.h"

/*
 * We allocate in as big chunks as we can, up to a maximum of 256 KB
 * per chunk.
 */
enum {
      MTHCA_ICM_ALLOC_SIZE   = 1 << 18,
      MTHCA_TABLE_CHUNK_SIZE = 1 << 18
};

struct mthca_user_db_table {
      struct mutex mutex;
      struct {
            u64                uvirt;
            struct scatterlist mem;
            int                refcount;
      }                page[0];
};

static void mthca_free_icm_pages(struct mthca_dev *dev, struct mthca_icm_chunk *chunk)
{
      int i;

      if (chunk->nsg > 0)
            pci_unmap_sg(dev->pdev, chunk->mem, chunk->npages,
                       PCI_DMA_BIDIRECTIONAL);

      for (i = 0; i < chunk->npages; ++i)
            __free_pages(sg_page(&chunk->mem[i]),
                       get_order(chunk->mem[i].length));
}

static void mthca_free_icm_coherent(struct mthca_dev *dev, struct mthca_icm_chunk *chunk)
{
      int i;

      for (i = 0; i < chunk->npages; ++i) {
            dma_free_coherent(&dev->pdev->dev, chunk->mem[i].length,
                          lowmem_page_address(sg_page(&chunk->mem[i])),
                          sg_dma_address(&chunk->mem[i]));
      }
}

void mthca_free_icm(struct mthca_dev *dev, struct mthca_icm *icm, int coherent)
{
      struct mthca_icm_chunk *chunk, *tmp;

      if (!icm)
            return;

      list_for_each_entry_safe(chunk, tmp, &icm->chunk_list, list) {
            if (coherent)
                  mthca_free_icm_coherent(dev, chunk);
            else
                  mthca_free_icm_pages(dev, chunk);

            kfree(chunk);
      }

      kfree(icm);
}

static int mthca_alloc_icm_pages(struct scatterlist *mem, int order, gfp_t gfp_mask)
{
      struct page *page;

      page = alloc_pages(gfp_mask, order);
      if (!page)
            return -ENOMEM;

      sg_set_page(mem, page, PAGE_SIZE << order, 0);
      return 0;
}

static int mthca_alloc_icm_coherent(struct device *dev, struct scatterlist *mem,
                            int order, gfp_t gfp_mask)
{
      void *buf = dma_alloc_coherent(dev, PAGE_SIZE << order, &sg_dma_address(mem),
                               gfp_mask);
      if (!buf)
            return -ENOMEM;

      sg_set_buf(mem, buf, PAGE_SIZE << order);
      BUG_ON(mem->offset);
      sg_dma_len(mem) = PAGE_SIZE << order;
      return 0;
}

struct mthca_icm *mthca_alloc_icm(struct mthca_dev *dev, int npages,
                          gfp_t gfp_mask, int coherent)
{
      struct mthca_icm *icm;
      struct mthca_icm_chunk *chunk = NULL;
      int cur_order;
      int ret;

      /* We use sg_set_buf for coherent allocs, which assumes low memory */
      BUG_ON(coherent && (gfp_mask & __GFP_HIGHMEM));

      icm = kmalloc(sizeof *icm, gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
      if (!icm)
            return icm;

      icm->refcount = 0;
      INIT_LIST_HEAD(&icm->chunk_list);

      cur_order = get_order(MTHCA_ICM_ALLOC_SIZE);

      while (npages > 0) {
            if (!chunk) {
                  chunk = kmalloc(sizeof *chunk,
                              gfp_mask & ~(__GFP_HIGHMEM | __GFP_NOWARN));
                  if (!chunk)
                        goto fail;

                  sg_init_table(chunk->mem, MTHCA_ICM_CHUNK_LEN);
                  chunk->npages = 0;
                  chunk->nsg    = 0;
                  list_add_tail(&chunk->list, &icm->chunk_list);
            }

            while (1 << cur_order > npages)
                  --cur_order;

            if (coherent)
                  ret = mthca_alloc_icm_coherent(&dev->pdev->dev,
                                           &chunk->mem[chunk->npages],
                                           cur_order, gfp_mask);
            else
                  ret = mthca_alloc_icm_pages(&chunk->mem[chunk->npages],
                                        cur_order, gfp_mask);

            if (!ret) {
                  ++chunk->npages;

                  if (coherent)
                        ++chunk->nsg;
                  else if (chunk->npages == MTHCA_ICM_CHUNK_LEN) {
                        chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
                                          chunk->npages,
                                          PCI_DMA_BIDIRECTIONAL);

                        if (chunk->nsg <= 0)
                              goto fail;
                  }

                  if (chunk->npages == MTHCA_ICM_CHUNK_LEN)
                        chunk = NULL;

                  npages -= 1 << cur_order;
            } else {
                  --cur_order;
                  if (cur_order < 0)
                        goto fail;
            }
      }

      if (!coherent && chunk) {
            chunk->nsg = pci_map_sg(dev->pdev, chunk->mem,
                              chunk->npages,
                              PCI_DMA_BIDIRECTIONAL);

            if (chunk->nsg <= 0)
                  goto fail;
      }

      return icm;

fail:
      mthca_free_icm(dev, icm, coherent);
      return NULL;
}

int mthca_table_get(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
{
      int i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;
      int ret = 0;
      u8 status;

      mutex_lock(&table->mutex);

      if (table->icm[i]) {
            ++table->icm[i]->refcount;
            goto out;
      }

      table->icm[i] = mthca_alloc_icm(dev, MTHCA_TABLE_CHUNK_SIZE >> PAGE_SHIFT,
                              (table->lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
                              __GFP_NOWARN, table->coherent);
      if (!table->icm[i]) {
            ret = -ENOMEM;
            goto out;
      }

      if (mthca_MAP_ICM(dev, table->icm[i], table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
                    &status) || status) {
            mthca_free_icm(dev, table->icm[i], table->coherent);
            table->icm[i] = NULL;
            ret = -ENOMEM;
            goto out;
      }

      ++table->icm[i]->refcount;

out:
      mutex_unlock(&table->mutex);
      return ret;
}

void mthca_table_put(struct mthca_dev *dev, struct mthca_icm_table *table, int obj)
{
      int i;
      u8 status;

      if (!mthca_is_memfree(dev))
            return;

      i = (obj & (table->num_obj - 1)) * table->obj_size / MTHCA_TABLE_CHUNK_SIZE;

      mutex_lock(&table->mutex);

      if (--table->icm[i]->refcount == 0) {
            mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
                        MTHCA_TABLE_CHUNK_SIZE / MTHCA_ICM_PAGE_SIZE,
                        &status);
            mthca_free_icm(dev, table->icm[i], table->coherent);
            table->icm[i] = NULL;
      }

      mutex_unlock(&table->mutex);
}

void *mthca_table_find(struct mthca_icm_table *table, int obj, dma_addr_t *dma_handle)
{
      int idx, offset, dma_offset, i;
      struct mthca_icm_chunk *chunk;
      struct mthca_icm *icm;
      struct page *page = NULL;

      if (!table->lowmem)
            return NULL;

      mutex_lock(&table->mutex);

      idx = (obj & (table->num_obj - 1)) * table->obj_size;
      icm = table->icm[idx / MTHCA_TABLE_CHUNK_SIZE];
      dma_offset = offset = idx % MTHCA_TABLE_CHUNK_SIZE;

      if (!icm)
            goto out;

      list_for_each_entry(chunk, &icm->chunk_list, list) {
            for (i = 0; i < chunk->npages; ++i) {
                  if (dma_handle && dma_offset >= 0) {
                        if (sg_dma_len(&chunk->mem[i]) > dma_offset)
                              *dma_handle = sg_dma_address(&chunk->mem[i]) +
                                    dma_offset;
                        dma_offset -= sg_dma_len(&chunk->mem[i]);
                  }
                  /* DMA mapping can merge pages but not split them,
                   * so if we found the page, dma_handle has already
                   * been assigned to. */
                  if (chunk->mem[i].length > offset) {
                        page = sg_page(&chunk->mem[i]);
                        goto out;
                  }
                  offset -= chunk->mem[i].length;
            }
      }

out:
      mutex_unlock(&table->mutex);
      return page ? lowmem_page_address(page) + offset : NULL;
}

int mthca_table_get_range(struct mthca_dev *dev, struct mthca_icm_table *table,
                    int start, int end)
{
      int inc = MTHCA_TABLE_CHUNK_SIZE / table->obj_size;
      int i, err;

      for (i = start; i <= end; i += inc) {
            err = mthca_table_get(dev, table, i);
            if (err)
                  goto fail;
      }

      return 0;

fail:
      while (i > start) {
            i -= inc;
            mthca_table_put(dev, table, i);
      }

      return err;
}

void mthca_table_put_range(struct mthca_dev *dev, struct mthca_icm_table *table,
                     int start, int end)
{
      int i;

      if (!mthca_is_memfree(dev))
            return;

      for (i = start; i <= end; i += MTHCA_TABLE_CHUNK_SIZE / table->obj_size)
            mthca_table_put(dev, table, i);
}

struct mthca_icm_table *mthca_alloc_icm_table(struct mthca_dev *dev,
                                    u64 virt, int obj_size,
                                    int nobj, int reserved,
                                    int use_lowmem, int use_coherent)
{
      struct mthca_icm_table *table;
      int num_icm;
      unsigned chunk_size;
      int i;
      u8 status;

      num_icm = (obj_size * nobj + MTHCA_TABLE_CHUNK_SIZE - 1) / MTHCA_TABLE_CHUNK_SIZE;

      table = kmalloc(sizeof *table + num_icm * sizeof *table->icm, GFP_KERNEL);
      if (!table)
            return NULL;

      table->virt     = virt;
      table->num_icm  = num_icm;
      table->num_obj  = nobj;
      table->obj_size = obj_size;
      table->lowmem   = use_lowmem;
      table->coherent = use_coherent;
      mutex_init(&table->mutex);

      for (i = 0; i < num_icm; ++i)
            table->icm[i] = NULL;

      for (i = 0; i * MTHCA_TABLE_CHUNK_SIZE < reserved * obj_size; ++i) {
            chunk_size = MTHCA_TABLE_CHUNK_SIZE;
            if ((i + 1) * MTHCA_TABLE_CHUNK_SIZE > nobj * obj_size)
                  chunk_size = nobj * obj_size - i * MTHCA_TABLE_CHUNK_SIZE;

            table->icm[i] = mthca_alloc_icm(dev, chunk_size >> PAGE_SHIFT,
                                    (use_lowmem ? GFP_KERNEL : GFP_HIGHUSER) |
                                    __GFP_NOWARN, use_coherent);
            if (!table->icm[i])
                  goto err;
            if (mthca_MAP_ICM(dev, table->icm[i], virt + i * MTHCA_TABLE_CHUNK_SIZE,
                          &status) || status) {
                  mthca_free_icm(dev, table->icm[i], table->coherent);
                  table->icm[i] = NULL;
                  goto err;
            }

            /*
             * Add a reference to this ICM chunk so that it never
             * gets freed (since it contains reserved firmware objects).
             */
            ++table->icm[i]->refcount;
      }

      return table;

err:
      for (i = 0; i < num_icm; ++i)
            if (table->icm[i]) {
                  mthca_UNMAP_ICM(dev, virt + i * MTHCA_TABLE_CHUNK_SIZE,
                              MTHCA_TABLE_CHUNK_SIZE / MTHCA_ICM_PAGE_SIZE,
                                &status);
                  mthca_free_icm(dev, table->icm[i], table->coherent);
            }

      kfree(table);

      return NULL;
}

void mthca_free_icm_table(struct mthca_dev *dev, struct mthca_icm_table *table)
{
      int i;
      u8 status;

      for (i = 0; i < table->num_icm; ++i)
            if (table->icm[i]) {
                  mthca_UNMAP_ICM(dev, table->virt + i * MTHCA_TABLE_CHUNK_SIZE,
                              MTHCA_TABLE_CHUNK_SIZE / MTHCA_ICM_PAGE_SIZE,
                              &status);
                  mthca_free_icm(dev, table->icm[i], table->coherent);
            }

      kfree(table);
}

static u64 mthca_uarc_virt(struct mthca_dev *dev, struct mthca_uar *uar, int page)
{
      return dev->uar_table.uarc_base +
            uar->index * dev->uar_table.uarc_size +
            page * MTHCA_ICM_PAGE_SIZE;
}

int mthca_map_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
                  struct mthca_user_db_table *db_tab, int index, u64 uaddr)
{
      struct page *pages[1];
      int ret = 0;
      u8 status;
      int i;

      if (!mthca_is_memfree(dev))
            return 0;

      if (index < 0 || index > dev->uar_table.uarc_size / 8)
            return -EINVAL;

      mutex_lock(&db_tab->mutex);

      i = index / MTHCA_DB_REC_PER_PAGE;

      if ((db_tab->page[i].refcount >= MTHCA_DB_REC_PER_PAGE)       ||
          (db_tab->page[i].uvirt && db_tab->page[i].uvirt != uaddr) ||
          (uaddr & 4095)) {
            ret = -EINVAL;
            goto out;
      }

      if (db_tab->page[i].refcount) {
            ++db_tab->page[i].refcount;
            goto out;
      }

      ret = get_user_pages(current, current->mm, uaddr & PAGE_MASK, 1, 1, 0,
                       pages, NULL);
      if (ret < 0)
            goto out;

      sg_set_page(&db_tab->page[i].mem, pages[0], MTHCA_ICM_PAGE_SIZE,
                  uaddr & ~PAGE_MASK);

      ret = pci_map_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
      if (ret < 0) {
            put_page(pages[0]);
            goto out;
      }

      ret = mthca_MAP_ICM_page(dev, sg_dma_address(&db_tab->page[i].mem),
                         mthca_uarc_virt(dev, uar, i), &status);
      if (!ret && status)
            ret = -EINVAL;
      if (ret) {
            pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
            put_page(sg_page(&db_tab->page[i].mem));
            goto out;
      }

      db_tab->page[i].uvirt    = uaddr;
      db_tab->page[i].refcount = 1;

out:
      mutex_unlock(&db_tab->mutex);
      return ret;
}

void mthca_unmap_user_db(struct mthca_dev *dev, struct mthca_uar *uar,
                   struct mthca_user_db_table *db_tab, int index)
{
      if (!mthca_is_memfree(dev))
            return;

      /*
       * To make our bookkeeping simpler, we don't unmap DB
       * pages until we clean up the whole db table.
       */

      mutex_lock(&db_tab->mutex);

      --db_tab->page[index / MTHCA_DB_REC_PER_PAGE].refcount;

      mutex_unlock(&db_tab->mutex);
}

struct mthca_user_db_table *mthca_init_user_db_tab(struct mthca_dev *dev)
{
      struct mthca_user_db_table *db_tab;
      int npages;
      int i;

      if (!mthca_is_memfree(dev))
            return NULL;

      npages = dev->uar_table.uarc_size / MTHCA_ICM_PAGE_SIZE;
      db_tab = kmalloc(sizeof *db_tab + npages * sizeof *db_tab->page, GFP_KERNEL);
      if (!db_tab)
            return ERR_PTR(-ENOMEM);

      mutex_init(&db_tab->mutex);
      for (i = 0; i < npages; ++i) {
            db_tab->page[i].refcount = 0;
            db_tab->page[i].uvirt    = 0;
      }

      return db_tab;
}

void mthca_cleanup_user_db_tab(struct mthca_dev *dev, struct mthca_uar *uar,
                         struct mthca_user_db_table *db_tab)
{
      int i;
      u8 status;

      if (!mthca_is_memfree(dev))
            return;

      for (i = 0; i < dev->uar_table.uarc_size / MTHCA_ICM_PAGE_SIZE; ++i) {
            if (db_tab->page[i].uvirt) {
                  mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, uar, i), 1, &status);
                  pci_unmap_sg(dev->pdev, &db_tab->page[i].mem, 1, PCI_DMA_TODEVICE);
                  put_page(sg_page(&db_tab->page[i].mem));
            }
      }

      kfree(db_tab);
}

int mthca_alloc_db(struct mthca_dev *dev, enum mthca_db_type type,
               u32 qn, __be32 **db)
{
      int group;
      int start, end, dir;
      int i, j;
      struct mthca_db_page *page;
      int ret = 0;
      u8 status;

      mutex_lock(&dev->db_tab->mutex);

      switch (type) {
      case MTHCA_DB_TYPE_CQ_ARM:
      case MTHCA_DB_TYPE_SQ:
            group = 0;
            start = 0;
            end   = dev->db_tab->max_group1;
            dir   = 1;
            break;

      case MTHCA_DB_TYPE_CQ_SET_CI:
      case MTHCA_DB_TYPE_RQ:
      case MTHCA_DB_TYPE_SRQ:
            group = 1;
            start = dev->db_tab->npages - 1;
            end   = dev->db_tab->min_group2;
            dir   = -1;
            break;

      default:
            ret = -EINVAL;
            goto out;
      }

      for (i = start; i != end; i += dir)
            if (dev->db_tab->page[i].db_rec &&
                !bitmap_full(dev->db_tab->page[i].used,
                         MTHCA_DB_REC_PER_PAGE)) {
                  page = dev->db_tab->page + i;
                  goto found;
            }

      for (i = start; i != end; i += dir)
            if (!dev->db_tab->page[i].db_rec) {
                  page = dev->db_tab->page + i;
                  goto alloc;
            }

      if (dev->db_tab->max_group1 >= dev->db_tab->min_group2 - 1) {
            ret = -ENOMEM;
            goto out;
      }

      if (group == 0)
            ++dev->db_tab->max_group1;
      else
            --dev->db_tab->min_group2;

      page = dev->db_tab->page + end;

alloc:
      page->db_rec = dma_alloc_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
                                &page->mapping, GFP_KERNEL);
      if (!page->db_rec) {
            ret = -ENOMEM;
            goto out;
      }
      memset(page->db_rec, 0, MTHCA_ICM_PAGE_SIZE);

      ret = mthca_MAP_ICM_page(dev, page->mapping,
                         mthca_uarc_virt(dev, &dev->driver_uar, i), &status);
      if (!ret && status)
            ret = -EINVAL;
      if (ret) {
            dma_free_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
                          page->db_rec, page->mapping);
            goto out;
      }

      bitmap_zero(page->used, MTHCA_DB_REC_PER_PAGE);

found:
      j = find_first_zero_bit(page->used, MTHCA_DB_REC_PER_PAGE);
      set_bit(j, page->used);

      if (group == 1)
            j = MTHCA_DB_REC_PER_PAGE - 1 - j;

      ret = i * MTHCA_DB_REC_PER_PAGE + j;

      page->db_rec[j] = cpu_to_be64((qn << 8) | (type << 5));

      *db = (__be32 *) &page->db_rec[j];

out:
      mutex_unlock(&dev->db_tab->mutex);

      return ret;
}

void mthca_free_db(struct mthca_dev *dev, int type, int db_index)
{
      int i, j;
      struct mthca_db_page *page;
      u8 status;

      i = db_index / MTHCA_DB_REC_PER_PAGE;
      j = db_index % MTHCA_DB_REC_PER_PAGE;

      page = dev->db_tab->page + i;

      mutex_lock(&dev->db_tab->mutex);

      page->db_rec[j] = 0;
      if (i >= dev->db_tab->min_group2)
            j = MTHCA_DB_REC_PER_PAGE - 1 - j;
      clear_bit(j, page->used);

      if (bitmap_empty(page->used, MTHCA_DB_REC_PER_PAGE) &&
          i >= dev->db_tab->max_group1 - 1) {
            mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status);

            dma_free_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
                          page->db_rec, page->mapping);
            page->db_rec = NULL;

            if (i == dev->db_tab->max_group1) {
                  --dev->db_tab->max_group1;
                  /* XXX may be able to unmap more pages now */
            }
            if (i == dev->db_tab->min_group2)
                  ++dev->db_tab->min_group2;
      }

      mutex_unlock(&dev->db_tab->mutex);
}

int mthca_init_db_tab(struct mthca_dev *dev)
{
      int i;

      if (!mthca_is_memfree(dev))
            return 0;

      dev->db_tab = kmalloc(sizeof *dev->db_tab, GFP_KERNEL);
      if (!dev->db_tab)
            return -ENOMEM;

      mutex_init(&dev->db_tab->mutex);

      dev->db_tab->npages     = dev->uar_table.uarc_size / MTHCA_ICM_PAGE_SIZE;
      dev->db_tab->max_group1 = 0;
      dev->db_tab->min_group2 = dev->db_tab->npages - 1;

      dev->db_tab->page = kmalloc(dev->db_tab->npages *
                            sizeof *dev->db_tab->page,
                            GFP_KERNEL);
      if (!dev->db_tab->page) {
            kfree(dev->db_tab);
            return -ENOMEM;
      }

      for (i = 0; i < dev->db_tab->npages; ++i)
            dev->db_tab->page[i].db_rec = NULL;

      return 0;
}

void mthca_cleanup_db_tab(struct mthca_dev *dev)
{
      int i;
      u8 status;

      if (!mthca_is_memfree(dev))
            return;

      /*
       * Because we don't always free our UARC pages when they
       * become empty to make mthca_free_db() simpler we need to
       * make a sweep through the doorbell pages and free any
       * leftover pages now.
       */
      for (i = 0; i < dev->db_tab->npages; ++i) {
            if (!dev->db_tab->page[i].db_rec)
                  continue;

            if (!bitmap_empty(dev->db_tab->page[i].used, MTHCA_DB_REC_PER_PAGE))
                  mthca_warn(dev, "Kernel UARC page %d not empty\n", i);

            mthca_UNMAP_ICM(dev, mthca_uarc_virt(dev, &dev->driver_uar, i), 1, &status);

            dma_free_coherent(&dev->pdev->dev, MTHCA_ICM_PAGE_SIZE,
                          dev->db_tab->page[i].db_rec,
                          dev->db_tab->page[i].mapping);
      }

      kfree(dev->db_tab->page);
      kfree(dev->db_tab);
}

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