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mthca_mr.c

/*
 * Copyright (c) 2004 Topspin Communications.  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: mthca_mr.c 1349 2004-12-16 21:09:43Z roland $
 */

#include <linux/slab.h>
#include <linux/errno.h>

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

struct mthca_mtt {
      struct mthca_buddy *buddy;
      int                 order;
      u32                 first_seg;
};

/*
 * Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
 */
struct mthca_mpt_entry {
      __be32 flags;
      __be32 page_size;
      __be32 key;
      __be32 pd;
      __be64 start;
      __be64 length;
      __be32 lkey;
      __be32 window_count;
      __be32 window_count_limit;
      __be64 mtt_seg;
      __be32 mtt_sz;          /* Arbel only */
      u32    reserved[2];
} __attribute__((packed));

#define MTHCA_MPT_FLAG_SW_OWNS       (0xfUL << 28)
#define MTHCA_MPT_FLAG_MIO           (1 << 17)
#define MTHCA_MPT_FLAG_BIND_ENABLE   (1 << 15)
#define MTHCA_MPT_FLAG_PHYSICAL      (1 <<  9)
#define MTHCA_MPT_FLAG_REGION        (1 <<  8)

#define MTHCA_MTT_FLAG_PRESENT       1

#define MTHCA_MPT_STATUS_SW 0xF0
#define MTHCA_MPT_STATUS_HW 0x00

#define SINAI_FMR_KEY_INC 0x1000000

/*
 * Buddy allocator for MTT segments (currently not very efficient
 * since it doesn't keep a free list and just searches linearly
 * through the bitmaps)
 */

static u32 mthca_buddy_alloc(struct mthca_buddy *buddy, int order)
{
      int o;
      int m;
      u32 seg;

      spin_lock(&buddy->lock);

      for (o = order; o <= buddy->max_order; ++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]);

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

      spin_unlock(&buddy->lock);

      seg <<= order;

      return seg;
}

static void mthca_buddy_free(struct mthca_buddy *buddy, u32 seg, int order)
{
      seg >>= order;

      spin_lock(&buddy->lock);

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

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

      spin_unlock(&buddy->lock);
}

static int mthca_buddy_init(struct mthca_buddy *buddy, int max_order)
{
      int i, s;

      buddy->max_order = max_order;
      spin_lock_init(&buddy->lock);

      buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
                        GFP_KERNEL);
      if (!buddy->bits)
            goto err_out;

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

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

      return 0;

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

      kfree(buddy->bits);

err_out:
      return -ENOMEM;
}

static void mthca_buddy_cleanup(struct mthca_buddy *buddy)
{
      int i;

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

      kfree(buddy->bits);
}

static u32 mthca_alloc_mtt_range(struct mthca_dev *dev, int order,
                         struct mthca_buddy *buddy)
{
      u32 seg = mthca_buddy_alloc(buddy, order);

      if (seg == -1)
            return -1;

      if (mthca_is_memfree(dev))
            if (mthca_table_get_range(dev, dev->mr_table.mtt_table, seg,
                                seg + (1 << order) - 1)) {
                  mthca_buddy_free(buddy, seg, order);
                  seg = -1;
            }

      return seg;
}

static struct mthca_mtt *__mthca_alloc_mtt(struct mthca_dev *dev, int size,
                                 struct mthca_buddy *buddy)
{
      struct mthca_mtt *mtt;
      int i;

      if (size <= 0)
            return ERR_PTR(-EINVAL);

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

      mtt->buddy = buddy;
      mtt->order = 0;
      for (i = MTHCA_MTT_SEG_SIZE / 8; i < size; i <<= 1)
            ++mtt->order;

      mtt->first_seg = mthca_alloc_mtt_range(dev, mtt->order, buddy);
      if (mtt->first_seg == -1) {
            kfree(mtt);
            return ERR_PTR(-ENOMEM);
      }

      return mtt;
}

struct mthca_mtt *mthca_alloc_mtt(struct mthca_dev *dev, int size)
{
      return __mthca_alloc_mtt(dev, size, &dev->mr_table.mtt_buddy);
}

void mthca_free_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt)
{
      if (!mtt)
            return;

      mthca_buddy_free(mtt->buddy, mtt->first_seg, mtt->order);

      mthca_table_put_range(dev, dev->mr_table.mtt_table,
                        mtt->first_seg,
                        mtt->first_seg + (1 << mtt->order) - 1);

      kfree(mtt);
}

static int __mthca_write_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt,
                       int start_index, u64 *buffer_list, int list_len)
{
      struct mthca_mailbox *mailbox;
      __be64 *mtt_entry;
      int err = 0;
      u8 status;
      int i;

      mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
      if (IS_ERR(mailbox))
            return PTR_ERR(mailbox);
      mtt_entry = mailbox->buf;

      while (list_len > 0) {
            mtt_entry[0] = cpu_to_be64(dev->mr_table.mtt_base +
                                 mtt->first_seg * MTHCA_MTT_SEG_SIZE +
                                 start_index * 8);
            mtt_entry[1] = 0;
            for (i = 0; i < list_len && i < MTHCA_MAILBOX_SIZE / 8 - 2; ++i)
                  mtt_entry[i + 2] = cpu_to_be64(buffer_list[i] |
                                           MTHCA_MTT_FLAG_PRESENT);

            /*
             * If we have an odd number of entries to write, add
             * one more dummy entry for firmware efficiency.
             */
            if (i & 1)
                  mtt_entry[i + 2] = 0;

            err = mthca_WRITE_MTT(dev, mailbox, (i + 1) & ~1, &status);
            if (err) {
                  mthca_warn(dev, "WRITE_MTT failed (%d)\n", err);
                  goto out;
            }
            if (status) {
                  mthca_warn(dev, "WRITE_MTT returned status 0x%02x\n",
                           status);
                  err = -EINVAL;
                  goto out;
            }

            list_len    -= i;
            start_index += i;
            buffer_list += i;
      }

out:
      mthca_free_mailbox(dev, mailbox);
      return err;
}

int mthca_write_mtt_size(struct mthca_dev *dev)
{
      if (dev->mr_table.fmr_mtt_buddy != &dev->mr_table.mtt_buddy ||
          !(dev->mthca_flags & MTHCA_FLAG_FMR))
            /*
             * Be friendly to WRITE_MTT command
             * and leave two empty slots for the
             * index and reserved fields of the
             * mailbox.
             */
            return PAGE_SIZE / sizeof (u64) - 2;

      /* For Arbel, all MTTs must fit in the same page. */
      return mthca_is_memfree(dev) ? (PAGE_SIZE / sizeof (u64)) : 0x7ffffff;
}

static void mthca_tavor_write_mtt_seg(struct mthca_dev *dev,
                              struct mthca_mtt *mtt, int start_index,
                              u64 *buffer_list, int list_len)
{
      u64 __iomem *mtts;
      int i;

      mtts = dev->mr_table.tavor_fmr.mtt_base + mtt->first_seg * MTHCA_MTT_SEG_SIZE +
            start_index * sizeof (u64);
      for (i = 0; i < list_len; ++i)
            mthca_write64_raw(cpu_to_be64(buffer_list[i] | MTHCA_MTT_FLAG_PRESENT),
                          mtts + i);
}

static void mthca_arbel_write_mtt_seg(struct mthca_dev *dev,
                              struct mthca_mtt *mtt, int start_index,
                              u64 *buffer_list, int list_len)
{
      __be64 *mtts;
      dma_addr_t dma_handle;
      int i;
      int s = start_index * sizeof (u64);

      /* For Arbel, all MTTs must fit in the same page. */
      BUG_ON(s / PAGE_SIZE != (s + list_len * sizeof(u64) - 1) / PAGE_SIZE);
      /* Require full segments */
      BUG_ON(s % MTHCA_MTT_SEG_SIZE);

      mtts = mthca_table_find(dev->mr_table.mtt_table, mtt->first_seg +
                        s / MTHCA_MTT_SEG_SIZE, &dma_handle);

      BUG_ON(!mtts);

      for (i = 0; i < list_len; ++i)
            mtts[i] = cpu_to_be64(buffer_list[i] | MTHCA_MTT_FLAG_PRESENT);

      dma_sync_single(&dev->pdev->dev, dma_handle, list_len * sizeof (u64), DMA_TO_DEVICE);
}

int mthca_write_mtt(struct mthca_dev *dev, struct mthca_mtt *mtt,
                int start_index, u64 *buffer_list, int list_len)
{
      int size = mthca_write_mtt_size(dev);
      int chunk;

      if (dev->mr_table.fmr_mtt_buddy != &dev->mr_table.mtt_buddy ||
          !(dev->mthca_flags & MTHCA_FLAG_FMR))
            return __mthca_write_mtt(dev, mtt, start_index, buffer_list, list_len);

      while (list_len > 0) {
            chunk = min(size, list_len);
            if (mthca_is_memfree(dev))
                  mthca_arbel_write_mtt_seg(dev, mtt, start_index,
                                      buffer_list, chunk);
            else
                  mthca_tavor_write_mtt_seg(dev, mtt, start_index,
                                      buffer_list, chunk);

            list_len    -= chunk;
            start_index += chunk;
            buffer_list += chunk;
      }

      return 0;
}

static inline u32 tavor_hw_index_to_key(u32 ind)
{
      return ind;
}

static inline u32 tavor_key_to_hw_index(u32 key)
{
      return key;
}

static inline u32 arbel_hw_index_to_key(u32 ind)
{
      return (ind >> 24) | (ind << 8);
}

static inline u32 arbel_key_to_hw_index(u32 key)
{
      return (key << 24) | (key >> 8);
}

static inline u32 hw_index_to_key(struct mthca_dev *dev, u32 ind)
{
      if (mthca_is_memfree(dev))
            return arbel_hw_index_to_key(ind);
      else
            return tavor_hw_index_to_key(ind);
}

static inline u32 key_to_hw_index(struct mthca_dev *dev, u32 key)
{
      if (mthca_is_memfree(dev))
            return arbel_key_to_hw_index(key);
      else
            return tavor_key_to_hw_index(key);
}

static inline u32 adjust_key(struct mthca_dev *dev, u32 key)
{
      if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
            return ((key << 20) & 0x800000) | (key & 0x7fffff);
      else
            return key;
}

int mthca_mr_alloc(struct mthca_dev *dev, u32 pd, int buffer_size_shift,
               u64 iova, u64 total_size, u32 access, struct mthca_mr *mr)
{
      struct mthca_mailbox *mailbox;
      struct mthca_mpt_entry *mpt_entry;
      u32 key;
      int i;
      int err;
      u8 status;

      WARN_ON(buffer_size_shift >= 32);

      key = mthca_alloc(&dev->mr_table.mpt_alloc);
      if (key == -1)
            return -ENOMEM;
      key = adjust_key(dev, key);
      mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);

      if (mthca_is_memfree(dev)) {
            err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
            if (err)
                  goto err_out_mpt_free;
      }

      mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
      if (IS_ERR(mailbox)) {
            err = PTR_ERR(mailbox);
            goto err_out_table;
      }
      mpt_entry = mailbox->buf;

      mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
                               MTHCA_MPT_FLAG_MIO         |
                               MTHCA_MPT_FLAG_REGION      |
                               access);
      if (!mr->mtt)
            mpt_entry->flags |= cpu_to_be32(MTHCA_MPT_FLAG_PHYSICAL);

      mpt_entry->page_size = cpu_to_be32(buffer_size_shift - 12);
      mpt_entry->key       = cpu_to_be32(key);
      mpt_entry->pd        = cpu_to_be32(pd);
      mpt_entry->start     = cpu_to_be64(iova);
      mpt_entry->length    = cpu_to_be64(total_size);

      memset(&mpt_entry->lkey, 0,
             sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));

      if (mr->mtt)
            mpt_entry->mtt_seg =
                  cpu_to_be64(dev->mr_table.mtt_base +
                            mr->mtt->first_seg * MTHCA_MTT_SEG_SIZE);

      if (0) {
            mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
            for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
                  if (i % 4 == 0)
                        printk("[%02x] ", i * 4);
                  printk(" %08x", be32_to_cpu(((__be32 *) mpt_entry)[i]));
                  if ((i + 1) % 4 == 0)
                        printk("\n");
            }
      }

      err = mthca_SW2HW_MPT(dev, mailbox,
                        key & (dev->limits.num_mpts - 1),
                        &status);
      if (err) {
            mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
            goto err_out_mailbox;
      } else if (status) {
            mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
                     status);
            err = -EINVAL;
            goto err_out_mailbox;
      }

      mthca_free_mailbox(dev, mailbox);
      return err;

err_out_mailbox:
      mthca_free_mailbox(dev, mailbox);

err_out_table:
      mthca_table_put(dev, dev->mr_table.mpt_table, key);

err_out_mpt_free:
      mthca_free(&dev->mr_table.mpt_alloc, key);
      return err;
}

int mthca_mr_alloc_notrans(struct mthca_dev *dev, u32 pd,
                     u32 access, struct mthca_mr *mr)
{
      mr->mtt = NULL;
      return mthca_mr_alloc(dev, pd, 12, 0, ~0ULL, access, mr);
}

int mthca_mr_alloc_phys(struct mthca_dev *dev, u32 pd,
                  u64 *buffer_list, int buffer_size_shift,
                  int list_len, u64 iova, u64 total_size,
                  u32 access, struct mthca_mr *mr)
{
      int err;

      mr->mtt = mthca_alloc_mtt(dev, list_len);
      if (IS_ERR(mr->mtt))
            return PTR_ERR(mr->mtt);

      err = mthca_write_mtt(dev, mr->mtt, 0, buffer_list, list_len);
      if (err) {
            mthca_free_mtt(dev, mr->mtt);
            return err;
      }

      err = mthca_mr_alloc(dev, pd, buffer_size_shift, iova,
                       total_size, access, mr);
      if (err)
            mthca_free_mtt(dev, mr->mtt);

      return err;
}

/* Free mr or fmr */
static void mthca_free_region(struct mthca_dev *dev, u32 lkey)
{
      mthca_table_put(dev, dev->mr_table.mpt_table,
                  key_to_hw_index(dev, lkey));

      mthca_free(&dev->mr_table.mpt_alloc, key_to_hw_index(dev, lkey));
}

void mthca_free_mr(struct mthca_dev *dev, struct mthca_mr *mr)
{
      int err;
      u8 status;

      err = mthca_HW2SW_MPT(dev, NULL,
                        key_to_hw_index(dev, mr->ibmr.lkey) &
                        (dev->limits.num_mpts - 1),
                        &status);
      if (err)
            mthca_warn(dev, "HW2SW_MPT failed (%d)\n", err);
      else if (status)
            mthca_warn(dev, "HW2SW_MPT returned status 0x%02x\n",
                     status);

      mthca_free_region(dev, mr->ibmr.lkey);
      mthca_free_mtt(dev, mr->mtt);
}

int mthca_fmr_alloc(struct mthca_dev *dev, u32 pd,
                u32 access, struct mthca_fmr *mr)
{
      struct mthca_mpt_entry *mpt_entry;
      struct mthca_mailbox *mailbox;
      u64 mtt_seg;
      u32 key, idx;
      u8 status;
      int list_len = mr->attr.max_pages;
      int err = -ENOMEM;
      int i;

      if (mr->attr.page_shift < 12 || mr->attr.page_shift >= 32)
            return -EINVAL;

      /* For Arbel, all MTTs must fit in the same page. */
      if (mthca_is_memfree(dev) &&
          mr->attr.max_pages * sizeof *mr->mem.arbel.mtts > PAGE_SIZE)
            return -EINVAL;

      mr->maps = 0;

      key = mthca_alloc(&dev->mr_table.mpt_alloc);
      if (key == -1)
            return -ENOMEM;
      key = adjust_key(dev, key);

      idx = key & (dev->limits.num_mpts - 1);
      mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);

      if (mthca_is_memfree(dev)) {
            err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
            if (err)
                  goto err_out_mpt_free;

            mr->mem.arbel.mpt = mthca_table_find(dev->mr_table.mpt_table, key, NULL);
            BUG_ON(!mr->mem.arbel.mpt);
      } else
            mr->mem.tavor.mpt = dev->mr_table.tavor_fmr.mpt_base +
                  sizeof *(mr->mem.tavor.mpt) * idx;

      mr->mtt = __mthca_alloc_mtt(dev, list_len, dev->mr_table.fmr_mtt_buddy);
      if (IS_ERR(mr->mtt))
            goto err_out_table;

      mtt_seg = mr->mtt->first_seg * MTHCA_MTT_SEG_SIZE;

      if (mthca_is_memfree(dev)) {
            mr->mem.arbel.mtts = mthca_table_find(dev->mr_table.mtt_table,
                                          mr->mtt->first_seg,
                                          &mr->mem.arbel.dma_handle);
            BUG_ON(!mr->mem.arbel.mtts);
      } else
            mr->mem.tavor.mtts = dev->mr_table.tavor_fmr.mtt_base + mtt_seg;

      mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
      if (IS_ERR(mailbox))
            goto err_out_free_mtt;

      mpt_entry = mailbox->buf;

      mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS     |
                               MTHCA_MPT_FLAG_MIO         |
                               MTHCA_MPT_FLAG_REGION      |
                               access);

      mpt_entry->page_size = cpu_to_be32(mr->attr.page_shift - 12);
      mpt_entry->key       = cpu_to_be32(key);
      mpt_entry->pd        = cpu_to_be32(pd);
      memset(&mpt_entry->start, 0,
             sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, start));
      mpt_entry->mtt_seg   = cpu_to_be64(dev->mr_table.mtt_base + mtt_seg);

      if (0) {
            mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
            for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
                  if (i % 4 == 0)
                        printk("[%02x] ", i * 4);
                  printk(" %08x", be32_to_cpu(((__be32 *) mpt_entry)[i]));
                  if ((i + 1) % 4 == 0)
                        printk("\n");
            }
      }

      err = mthca_SW2HW_MPT(dev, mailbox,
                        key & (dev->limits.num_mpts - 1),
                        &status);
      if (err) {
            mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
            goto err_out_mailbox_free;
      }
      if (status) {
            mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
                     status);
            err = -EINVAL;
            goto err_out_mailbox_free;
      }

      mthca_free_mailbox(dev, mailbox);
      return 0;

err_out_mailbox_free:
      mthca_free_mailbox(dev, mailbox);

err_out_free_mtt:
      mthca_free_mtt(dev, mr->mtt);

err_out_table:
      mthca_table_put(dev, dev->mr_table.mpt_table, key);

err_out_mpt_free:
      mthca_free(&dev->mr_table.mpt_alloc, mr->ibmr.lkey);
      return err;
}

int mthca_free_fmr(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
      if (fmr->maps)
            return -EBUSY;

      mthca_free_region(dev, fmr->ibmr.lkey);
      mthca_free_mtt(dev, fmr->mtt);

      return 0;
}

static inline int mthca_check_fmr(struct mthca_fmr *fmr, u64 *page_list,
                          int list_len, u64 iova)
{
      int i, page_mask;

      if (list_len > fmr->attr.max_pages)
            return -EINVAL;

      page_mask = (1 << fmr->attr.page_shift) - 1;

      /* We are getting page lists, so va must be page aligned. */
      if (iova & page_mask)
            return -EINVAL;

      /* Trust the user not to pass misaligned data in page_list */
      if (0)
            for (i = 0; i < list_len; ++i) {
                  if (page_list[i] & ~page_mask)
                        return -EINVAL;
            }

      if (fmr->maps >= fmr->attr.max_maps)
            return -EINVAL;

      return 0;
}


int mthca_tavor_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
                       int list_len, u64 iova)
{
      struct mthca_fmr *fmr = to_mfmr(ibfmr);
      struct mthca_dev *dev = to_mdev(ibfmr->device);
      struct mthca_mpt_entry mpt_entry;
      u32 key;
      int i, err;

      err = mthca_check_fmr(fmr, page_list, list_len, iova);
      if (err)
            return err;

      ++fmr->maps;

      key = tavor_key_to_hw_index(fmr->ibmr.lkey);
      key += dev->limits.num_mpts;
      fmr->ibmr.lkey = fmr->ibmr.rkey = tavor_hw_index_to_key(key);

      writeb(MTHCA_MPT_STATUS_SW, fmr->mem.tavor.mpt);

      for (i = 0; i < list_len; ++i) {
            __be64 mtt_entry = cpu_to_be64(page_list[i] |
                                     MTHCA_MTT_FLAG_PRESENT);
            mthca_write64_raw(mtt_entry, fmr->mem.tavor.mtts + i);
      }

      mpt_entry.lkey   = cpu_to_be32(key);
      mpt_entry.length = cpu_to_be64(list_len * (1ull << fmr->attr.page_shift));
      mpt_entry.start  = cpu_to_be64(iova);

      __raw_writel((__force u32) mpt_entry.lkey, &fmr->mem.tavor.mpt->key);
      memcpy_toio(&fmr->mem.tavor.mpt->start, &mpt_entry.start,
                offsetof(struct mthca_mpt_entry, window_count) -
                offsetof(struct mthca_mpt_entry, start));

      writeb(MTHCA_MPT_STATUS_HW, fmr->mem.tavor.mpt);

      return 0;
}

int mthca_arbel_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
                       int list_len, u64 iova)
{
      struct mthca_fmr *fmr = to_mfmr(ibfmr);
      struct mthca_dev *dev = to_mdev(ibfmr->device);
      u32 key;
      int i, err;

      err = mthca_check_fmr(fmr, page_list, list_len, iova);
      if (err)
            return err;

      ++fmr->maps;

      key = arbel_key_to_hw_index(fmr->ibmr.lkey);
      if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
            key += SINAI_FMR_KEY_INC;
      else
            key += dev->limits.num_mpts;
      fmr->ibmr.lkey = fmr->ibmr.rkey = arbel_hw_index_to_key(key);

      *(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_SW;

      wmb();

      for (i = 0; i < list_len; ++i)
            fmr->mem.arbel.mtts[i] = cpu_to_be64(page_list[i] |
                                         MTHCA_MTT_FLAG_PRESENT);

      dma_sync_single(&dev->pdev->dev, fmr->mem.arbel.dma_handle,
                  list_len * sizeof(u64), DMA_TO_DEVICE);

      fmr->mem.arbel.mpt->key    = cpu_to_be32(key);
      fmr->mem.arbel.mpt->lkey   = cpu_to_be32(key);
      fmr->mem.arbel.mpt->length = cpu_to_be64(list_len * (1ull << fmr->attr.page_shift));
      fmr->mem.arbel.mpt->start  = cpu_to_be64(iova);

      wmb();

      *(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_HW;

      wmb();

      return 0;
}

void mthca_tavor_fmr_unmap(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
      u32 key;

      if (!fmr->maps)
            return;

      key = tavor_key_to_hw_index(fmr->ibmr.lkey);
      key &= dev->limits.num_mpts - 1;
      fmr->ibmr.lkey = fmr->ibmr.rkey = tavor_hw_index_to_key(key);

      fmr->maps = 0;

      writeb(MTHCA_MPT_STATUS_SW, fmr->mem.tavor.mpt);
}

void mthca_arbel_fmr_unmap(struct mthca_dev *dev, struct mthca_fmr *fmr)
{
      u32 key;

      if (!fmr->maps)
            return;

      key = arbel_key_to_hw_index(fmr->ibmr.lkey);
      key &= dev->limits.num_mpts - 1;
      key = adjust_key(dev, key);
      fmr->ibmr.lkey = fmr->ibmr.rkey = arbel_hw_index_to_key(key);

      fmr->maps = 0;

      *(u8 *) fmr->mem.arbel.mpt = MTHCA_MPT_STATUS_SW;
}

int mthca_init_mr_table(struct mthca_dev *dev)
{
      unsigned long addr;
      int mpts, mtts, err, i;

      err = mthca_alloc_init(&dev->mr_table.mpt_alloc,
                         dev->limits.num_mpts,
                         ~0, dev->limits.reserved_mrws);
      if (err)
            return err;

      if (!mthca_is_memfree(dev) &&
          (dev->mthca_flags & MTHCA_FLAG_DDR_HIDDEN))
            dev->limits.fmr_reserved_mtts = 0;
      else
            dev->mthca_flags |= MTHCA_FLAG_FMR;

      if (dev->mthca_flags & MTHCA_FLAG_SINAI_OPT)
            mthca_dbg(dev, "Memory key throughput optimization activated.\n");

      err = mthca_buddy_init(&dev->mr_table.mtt_buddy,
                         fls(dev->limits.num_mtt_segs - 1));

      if (err)
            goto err_mtt_buddy;

      dev->mr_table.tavor_fmr.mpt_base = NULL;
      dev->mr_table.tavor_fmr.mtt_base = NULL;

      if (dev->limits.fmr_reserved_mtts) {
            i = fls(dev->limits.fmr_reserved_mtts - 1);

            if (i >= 31) {
                  mthca_warn(dev, "Unable to reserve 2^31 FMR MTTs.\n");
                  err = -EINVAL;
                  goto err_fmr_mpt;
            }
            mpts = mtts = 1 << i;
      } else {
            mtts = dev->limits.num_mtt_segs;
            mpts = dev->limits.num_mpts;
      }

      if (!mthca_is_memfree(dev) &&
          (dev->mthca_flags & MTHCA_FLAG_FMR)) {

            addr = pci_resource_start(dev->pdev, 4) +
                  ((pci_resource_len(dev->pdev, 4) - 1) &
                   dev->mr_table.mpt_base);

            dev->mr_table.tavor_fmr.mpt_base =
                  ioremap(addr, mpts * sizeof(struct mthca_mpt_entry));

            if (!dev->mr_table.tavor_fmr.mpt_base) {
                  mthca_warn(dev, "MPT ioremap for FMR failed.\n");
                  err = -ENOMEM;
                  goto err_fmr_mpt;
            }

            addr = pci_resource_start(dev->pdev, 4) +
                  ((pci_resource_len(dev->pdev, 4) - 1) &
                   dev->mr_table.mtt_base);

            dev->mr_table.tavor_fmr.mtt_base =
                  ioremap(addr, mtts * MTHCA_MTT_SEG_SIZE);
            if (!dev->mr_table.tavor_fmr.mtt_base) {
                  mthca_warn(dev, "MTT ioremap for FMR failed.\n");
                  err = -ENOMEM;
                  goto err_fmr_mtt;
            }
      }

      if (dev->limits.fmr_reserved_mtts) {
            err = mthca_buddy_init(&dev->mr_table.tavor_fmr.mtt_buddy, fls(mtts - 1));
            if (err)
                  goto err_fmr_mtt_buddy;

            /* Prevent regular MRs from using FMR keys */
            err = mthca_buddy_alloc(&dev->mr_table.mtt_buddy, fls(mtts - 1));
            if (err)
                  goto err_reserve_fmr;

            dev->mr_table.fmr_mtt_buddy =
                  &dev->mr_table.tavor_fmr.mtt_buddy;
      } else
            dev->mr_table.fmr_mtt_buddy = &dev->mr_table.mtt_buddy;

      /* FMR table is always the first, take reserved MTTs out of there */
      if (dev->limits.reserved_mtts) {
            i = fls(dev->limits.reserved_mtts - 1);

            if (mthca_alloc_mtt_range(dev, i,
                                dev->mr_table.fmr_mtt_buddy) == -1) {
                  mthca_warn(dev, "MTT table of order %d is too small.\n",
                          dev->mr_table.fmr_mtt_buddy->max_order);
                  err = -ENOMEM;
                  goto err_reserve_mtts;
            }
      }

      return 0;

err_reserve_mtts:
err_reserve_fmr:
      if (dev->limits.fmr_reserved_mtts)
            mthca_buddy_cleanup(&dev->mr_table.tavor_fmr.mtt_buddy);

err_fmr_mtt_buddy:
      if (dev->mr_table.tavor_fmr.mtt_base)
            iounmap(dev->mr_table.tavor_fmr.mtt_base);

err_fmr_mtt:
      if (dev->mr_table.tavor_fmr.mpt_base)
            iounmap(dev->mr_table.tavor_fmr.mpt_base);

err_fmr_mpt:
      mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);

err_mtt_buddy:
      mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);

      return err;
}

void mthca_cleanup_mr_table(struct mthca_dev *dev)
{
      /* XXX check if any MRs are still allocated? */
      if (dev->limits.fmr_reserved_mtts)
            mthca_buddy_cleanup(&dev->mr_table.tavor_fmr.mtt_buddy);

      mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);

      if (dev->mr_table.tavor_fmr.mtt_base)
            iounmap(dev->mr_table.tavor_fmr.mtt_base);
      if (dev->mr_table.tavor_fmr.mpt_base)
            iounmap(dev->mr_table.tavor_fmr.mpt_base);

      mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
}

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