![Jack Morgenstein](/assets/img/avatar_default.png)
mlx4_mr_alloc() doesn't actually allocate mr (it just initializes the pointer that the caller passes in), so it shouldn't free it if an error occurs. Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
473 lines
11 KiB
C
473 lines
11 KiB
C
/*
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* Copyright (c) 2004 Topspin Communications. All rights reserved.
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* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
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* Copyright (c) 2006, 2007 Cisco Systems, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/mlx4/cmd.h>
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#include "mlx4.h"
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#include "icm.h"
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/*
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* Must be packed because mtt_seg is 64 bits but only aligned to 32 bits.
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*/
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struct mlx4_mpt_entry {
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__be32 flags;
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__be32 qpn;
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__be32 key;
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__be32 pd;
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__be64 start;
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__be64 length;
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__be32 lkey;
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__be32 win_cnt;
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u8 reserved1[3];
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u8 mtt_rep;
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__be64 mtt_seg;
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__be32 mtt_sz;
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__be32 entity_size;
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__be32 first_byte_offset;
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} __attribute__((packed));
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#define MLX4_MPT_FLAG_SW_OWNS (0xfUL << 28)
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#define MLX4_MPT_FLAG_MIO (1 << 17)
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#define MLX4_MPT_FLAG_BIND_ENABLE (1 << 15)
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#define MLX4_MPT_FLAG_PHYSICAL (1 << 9)
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#define MLX4_MPT_FLAG_REGION (1 << 8)
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#define MLX4_MTT_FLAG_PRESENT 1
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static u32 mlx4_buddy_alloc(struct mlx4_buddy *buddy, int order)
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{
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int o;
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int m;
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u32 seg;
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spin_lock(&buddy->lock);
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for (o = order; o <= buddy->max_order; ++o) {
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m = 1 << (buddy->max_order - o);
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seg = find_first_bit(buddy->bits[o], m);
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if (seg < m)
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goto found;
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}
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spin_unlock(&buddy->lock);
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return -1;
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found:
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clear_bit(seg, buddy->bits[o]);
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while (o > order) {
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--o;
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seg <<= 1;
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set_bit(seg ^ 1, buddy->bits[o]);
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}
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spin_unlock(&buddy->lock);
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seg <<= order;
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return seg;
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}
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static void mlx4_buddy_free(struct mlx4_buddy *buddy, u32 seg, int order)
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{
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seg >>= order;
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spin_lock(&buddy->lock);
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while (test_bit(seg ^ 1, buddy->bits[order])) {
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clear_bit(seg ^ 1, buddy->bits[order]);
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seg >>= 1;
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++order;
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}
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set_bit(seg, buddy->bits[order]);
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spin_unlock(&buddy->lock);
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}
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static int __devinit mlx4_buddy_init(struct mlx4_buddy *buddy, int max_order)
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{
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int i, s;
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buddy->max_order = max_order;
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spin_lock_init(&buddy->lock);
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buddy->bits = kzalloc((buddy->max_order + 1) * sizeof (long *),
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GFP_KERNEL);
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if (!buddy->bits)
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goto err_out;
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for (i = 0; i <= buddy->max_order; ++i) {
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s = BITS_TO_LONGS(1 << (buddy->max_order - i));
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buddy->bits[i] = kmalloc(s * sizeof (long), GFP_KERNEL);
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if (!buddy->bits[i])
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goto err_out_free;
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bitmap_zero(buddy->bits[i], 1 << (buddy->max_order - i));
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}
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set_bit(0, buddy->bits[buddy->max_order]);
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return 0;
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err_out_free:
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for (i = 0; i <= buddy->max_order; ++i)
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kfree(buddy->bits[i]);
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kfree(buddy->bits);
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err_out:
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return -ENOMEM;
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}
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static void mlx4_buddy_cleanup(struct mlx4_buddy *buddy)
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{
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int i;
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for (i = 0; i <= buddy->max_order; ++i)
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kfree(buddy->bits[i]);
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kfree(buddy->bits);
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}
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static u32 mlx4_alloc_mtt_range(struct mlx4_dev *dev, int order)
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{
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struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
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u32 seg;
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seg = mlx4_buddy_alloc(&mr_table->mtt_buddy, order);
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if (seg == -1)
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return -1;
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if (mlx4_table_get_range(dev, &mr_table->mtt_table, seg,
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seg + (1 << order) - 1)) {
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mlx4_buddy_free(&mr_table->mtt_buddy, seg, order);
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return -1;
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}
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return seg;
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}
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int mlx4_mtt_init(struct mlx4_dev *dev, int npages, int page_shift,
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struct mlx4_mtt *mtt)
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{
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int i;
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if (!npages) {
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mtt->order = -1;
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mtt->page_shift = MLX4_ICM_PAGE_SHIFT;
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return 0;
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} else
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mtt->page_shift = page_shift;
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for (mtt->order = 0, i = MLX4_MTT_ENTRY_PER_SEG; i < npages; i <<= 1)
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++mtt->order;
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mtt->first_seg = mlx4_alloc_mtt_range(dev, mtt->order);
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if (mtt->first_seg == -1)
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return -ENOMEM;
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return 0;
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}
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EXPORT_SYMBOL_GPL(mlx4_mtt_init);
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void mlx4_mtt_cleanup(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
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{
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struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
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if (mtt->order < 0)
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return;
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mlx4_buddy_free(&mr_table->mtt_buddy, mtt->first_seg, mtt->order);
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mlx4_table_put_range(dev, &mr_table->mtt_table, mtt->first_seg,
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mtt->first_seg + (1 << mtt->order) - 1);
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}
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EXPORT_SYMBOL_GPL(mlx4_mtt_cleanup);
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u64 mlx4_mtt_addr(struct mlx4_dev *dev, struct mlx4_mtt *mtt)
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{
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return (u64) mtt->first_seg * dev->caps.mtt_entry_sz;
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}
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EXPORT_SYMBOL_GPL(mlx4_mtt_addr);
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static u32 hw_index_to_key(u32 ind)
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{
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return (ind >> 24) | (ind << 8);
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}
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static u32 key_to_hw_index(u32 key)
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{
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return (key << 24) | (key >> 8);
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}
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static int mlx4_SW2HW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
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int mpt_index)
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{
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return mlx4_cmd(dev, mailbox->dma, mpt_index, 0, MLX4_CMD_SW2HW_MPT,
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MLX4_CMD_TIME_CLASS_B);
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}
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static int mlx4_HW2SW_MPT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
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int mpt_index)
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{
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return mlx4_cmd_box(dev, 0, mailbox ? mailbox->dma : 0, mpt_index,
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!mailbox, MLX4_CMD_HW2SW_MPT, MLX4_CMD_TIME_CLASS_B);
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}
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int mlx4_mr_alloc(struct mlx4_dev *dev, u32 pd, u64 iova, u64 size, u32 access,
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int npages, int page_shift, struct mlx4_mr *mr)
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{
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struct mlx4_priv *priv = mlx4_priv(dev);
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u32 index;
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int err;
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index = mlx4_bitmap_alloc(&priv->mr_table.mpt_bitmap);
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if (index == -1)
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return -ENOMEM;
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mr->iova = iova;
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mr->size = size;
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mr->pd = pd;
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mr->access = access;
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mr->enabled = 0;
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mr->key = hw_index_to_key(index);
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err = mlx4_mtt_init(dev, npages, page_shift, &mr->mtt);
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if (err)
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mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, index);
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return err;
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}
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EXPORT_SYMBOL_GPL(mlx4_mr_alloc);
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void mlx4_mr_free(struct mlx4_dev *dev, struct mlx4_mr *mr)
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{
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struct mlx4_priv *priv = mlx4_priv(dev);
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int err;
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if (mr->enabled) {
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err = mlx4_HW2SW_MPT(dev, NULL,
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key_to_hw_index(mr->key) &
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(dev->caps.num_mpts - 1));
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if (err)
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mlx4_warn(dev, "HW2SW_MPT failed (%d)\n", err);
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}
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mlx4_mtt_cleanup(dev, &mr->mtt);
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mlx4_bitmap_free(&priv->mr_table.mpt_bitmap, key_to_hw_index(mr->key));
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}
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EXPORT_SYMBOL_GPL(mlx4_mr_free);
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int mlx4_mr_enable(struct mlx4_dev *dev, struct mlx4_mr *mr)
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{
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struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
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struct mlx4_cmd_mailbox *mailbox;
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struct mlx4_mpt_entry *mpt_entry;
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int err;
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err = mlx4_table_get(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
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if (err)
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return err;
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mailbox = mlx4_alloc_cmd_mailbox(dev);
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if (IS_ERR(mailbox)) {
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err = PTR_ERR(mailbox);
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goto err_table;
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}
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mpt_entry = mailbox->buf;
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memset(mpt_entry, 0, sizeof *mpt_entry);
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mpt_entry->flags = cpu_to_be32(MLX4_MPT_FLAG_SW_OWNS |
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MLX4_MPT_FLAG_MIO |
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MLX4_MPT_FLAG_REGION |
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mr->access);
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mpt_entry->key = cpu_to_be32(key_to_hw_index(mr->key));
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mpt_entry->pd = cpu_to_be32(mr->pd);
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mpt_entry->start = cpu_to_be64(mr->iova);
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mpt_entry->length = cpu_to_be64(mr->size);
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mpt_entry->entity_size = cpu_to_be32(mr->mtt.page_shift);
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if (mr->mtt.order < 0) {
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mpt_entry->flags |= cpu_to_be32(MLX4_MPT_FLAG_PHYSICAL);
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mpt_entry->mtt_seg = 0;
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} else
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mpt_entry->mtt_seg = cpu_to_be64(mlx4_mtt_addr(dev, &mr->mtt));
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err = mlx4_SW2HW_MPT(dev, mailbox,
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key_to_hw_index(mr->key) & (dev->caps.num_mpts - 1));
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if (err) {
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mlx4_warn(dev, "SW2HW_MPT failed (%d)\n", err);
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goto err_cmd;
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}
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mr->enabled = 1;
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mlx4_free_cmd_mailbox(dev, mailbox);
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return 0;
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err_cmd:
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mlx4_free_cmd_mailbox(dev, mailbox);
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err_table:
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mlx4_table_put(dev, &mr_table->dmpt_table, key_to_hw_index(mr->key));
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return err;
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}
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EXPORT_SYMBOL_GPL(mlx4_mr_enable);
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static int mlx4_WRITE_MTT(struct mlx4_dev *dev, struct mlx4_cmd_mailbox *mailbox,
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int num_mtt)
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{
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return mlx4_cmd(dev, mailbox->dma, num_mtt, 0, MLX4_CMD_WRITE_MTT,
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MLX4_CMD_TIME_CLASS_B);
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}
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int mlx4_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
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int start_index, int npages, u64 *page_list)
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{
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struct mlx4_cmd_mailbox *mailbox;
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__be64 *mtt_entry;
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int i;
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int err = 0;
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if (mtt->order < 0)
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return -EINVAL;
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mailbox = mlx4_alloc_cmd_mailbox(dev);
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if (IS_ERR(mailbox))
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return PTR_ERR(mailbox);
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mtt_entry = mailbox->buf;
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while (npages > 0) {
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mtt_entry[0] = cpu_to_be64(mlx4_mtt_addr(dev, mtt) + start_index * 8);
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mtt_entry[1] = 0;
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for (i = 0; i < npages && i < MLX4_MAILBOX_SIZE / 8 - 2; ++i)
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mtt_entry[i + 2] = cpu_to_be64(page_list[i] |
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MLX4_MTT_FLAG_PRESENT);
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/*
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* If we have an odd number of entries to write, add
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* one more dummy entry for firmware efficiency.
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*/
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if (i & 1)
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mtt_entry[i + 2] = 0;
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err = mlx4_WRITE_MTT(dev, mailbox, (i + 1) & ~1);
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if (err)
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goto out;
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npages -= i;
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start_index += i;
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page_list += i;
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}
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out:
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mlx4_free_cmd_mailbox(dev, mailbox);
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return err;
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}
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EXPORT_SYMBOL_GPL(mlx4_write_mtt);
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int mlx4_buf_write_mtt(struct mlx4_dev *dev, struct mlx4_mtt *mtt,
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struct mlx4_buf *buf)
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{
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u64 *page_list;
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int err;
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int i;
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page_list = kmalloc(buf->npages * sizeof *page_list, GFP_KERNEL);
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if (!page_list)
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return -ENOMEM;
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for (i = 0; i < buf->npages; ++i)
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if (buf->nbufs == 1)
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page_list[i] = buf->u.direct.map + (i << buf->page_shift);
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else
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page_list[i] = buf->u.page_list[i].map;
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err = mlx4_write_mtt(dev, mtt, 0, buf->npages, page_list);
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kfree(page_list);
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return err;
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}
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EXPORT_SYMBOL_GPL(mlx4_buf_write_mtt);
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int __devinit mlx4_init_mr_table(struct mlx4_dev *dev)
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{
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struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
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int err;
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err = mlx4_bitmap_init(&mr_table->mpt_bitmap, dev->caps.num_mpts,
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~0, dev->caps.reserved_mrws);
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if (err)
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return err;
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err = mlx4_buddy_init(&mr_table->mtt_buddy,
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ilog2(dev->caps.num_mtt_segs));
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if (err)
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goto err_buddy;
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if (dev->caps.reserved_mtts) {
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if (mlx4_alloc_mtt_range(dev, ilog2(dev->caps.reserved_mtts)) == -1) {
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mlx4_warn(dev, "MTT table of order %d is too small.\n",
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mr_table->mtt_buddy.max_order);
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err = -ENOMEM;
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goto err_reserve_mtts;
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}
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}
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return 0;
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err_reserve_mtts:
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mlx4_buddy_cleanup(&mr_table->mtt_buddy);
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err_buddy:
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mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
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return err;
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}
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void mlx4_cleanup_mr_table(struct mlx4_dev *dev)
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{
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struct mlx4_mr_table *mr_table = &mlx4_priv(dev)->mr_table;
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mlx4_buddy_cleanup(&mr_table->mtt_buddy);
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mlx4_bitmap_cleanup(&mr_table->mpt_bitmap);
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}
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