9095e208d8
Encapsulate the buddy allocator used for MTT segments. This cleans up the code and also gets us ready to add FMR support. Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il> Signed-off-by: Roland Dreier <roland@topspin.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
490 lines
12 KiB
C
490 lines
12 KiB
C
/*
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* Copyright (c) 2004 Topspin Communications. 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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* $Id: mthca_mr.c 1349 2004-12-16 21:09:43Z roland $
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*/
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include "mthca_dev.h"
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#include "mthca_cmd.h"
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#include "mthca_memfree.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 mthca_mpt_entry {
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u32 flags;
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u32 page_size;
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u32 key;
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u32 pd;
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u64 start;
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u64 length;
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u32 lkey;
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u32 window_count;
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u32 window_count_limit;
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u64 mtt_seg;
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u32 mtt_sz; /* Arbel only */
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u32 reserved[2];
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} __attribute__((packed));
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#define MTHCA_MPT_FLAG_SW_OWNS (0xfUL << 28)
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#define MTHCA_MPT_FLAG_MIO (1 << 17)
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#define MTHCA_MPT_FLAG_BIND_ENABLE (1 << 15)
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#define MTHCA_MPT_FLAG_PHYSICAL (1 << 9)
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#define MTHCA_MPT_FLAG_REGION (1 << 8)
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#define MTHCA_MTT_FLAG_PRESENT 1
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/*
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* Buddy allocator for MTT segments (currently not very efficient
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* since it doesn't keep a free list and just searches linearly
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* through the bitmaps)
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*/
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static u32 mthca_buddy_alloc(struct mthca_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 mthca_buddy_free(struct mthca_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 mthca_buddy_init(struct mthca_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 = kmalloc((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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memset(buddy->bits, 0, (buddy->max_order + 1) * sizeof (long *));
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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],
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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 __devexit mthca_buddy_cleanup(struct mthca_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 mthca_alloc_mtt(struct mthca_dev *dev, int order,
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struct mthca_buddy *buddy)
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{
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u32 seg = mthca_buddy_alloc(buddy, order);
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if (seg == -1)
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return -1;
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if (dev->hca_type == ARBEL_NATIVE)
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if (mthca_table_get_range(dev, dev->mr_table.mtt_table, seg,
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seg + (1 << order) - 1)) {
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mthca_buddy_free(buddy, seg, order);
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seg = -1;
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}
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return seg;
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}
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static void mthca_free_mtt(struct mthca_dev *dev, u32 seg, int order,
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struct mthca_buddy* buddy)
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{
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mthca_buddy_free(buddy, seg, order);
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if (dev->hca_type == ARBEL_NATIVE)
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mthca_table_put_range(dev, dev->mr_table.mtt_table, seg,
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seg + (1 << order) - 1);
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}
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static inline u32 hw_index_to_key(struct mthca_dev *dev, u32 ind)
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{
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if (dev->hca_type == ARBEL_NATIVE)
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return (ind >> 24) | (ind << 8);
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else
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return ind;
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}
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static inline u32 key_to_hw_index(struct mthca_dev *dev, u32 key)
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{
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if (dev->hca_type == ARBEL_NATIVE)
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return (key << 24) | (key >> 8);
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else
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return key;
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}
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int mthca_mr_alloc_notrans(struct mthca_dev *dev, u32 pd,
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u32 access, struct mthca_mr *mr)
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{
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void *mailbox = NULL;
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struct mthca_mpt_entry *mpt_entry;
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u32 key;
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int err;
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u8 status;
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might_sleep();
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mr->order = -1;
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key = mthca_alloc(&dev->mr_table.mpt_alloc);
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if (key == -1)
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return -ENOMEM;
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mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);
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if (dev->hca_type == ARBEL_NATIVE) {
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err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
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if (err)
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goto err_out_mpt_free;
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}
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mailbox = kmalloc(sizeof *mpt_entry + MTHCA_CMD_MAILBOX_EXTRA,
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GFP_KERNEL);
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if (!mailbox) {
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err = -ENOMEM;
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goto err_out_table;
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}
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mpt_entry = MAILBOX_ALIGN(mailbox);
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mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS |
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MTHCA_MPT_FLAG_MIO |
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MTHCA_MPT_FLAG_PHYSICAL |
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MTHCA_MPT_FLAG_REGION |
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access);
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mpt_entry->page_size = 0;
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mpt_entry->key = cpu_to_be32(key);
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mpt_entry->pd = cpu_to_be32(pd);
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mpt_entry->start = 0;
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mpt_entry->length = ~0ULL;
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memset(&mpt_entry->lkey, 0,
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sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));
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err = mthca_SW2HW_MPT(dev, mpt_entry,
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key & (dev->limits.num_mpts - 1),
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&status);
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if (err) {
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mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
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goto err_out_table;
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} else if (status) {
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mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
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status);
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err = -EINVAL;
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goto err_out_table;
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}
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kfree(mailbox);
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return err;
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err_out_table:
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if (dev->hca_type == ARBEL_NATIVE)
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mthca_table_put(dev, dev->mr_table.mpt_table, key);
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err_out_mpt_free:
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mthca_free(&dev->mr_table.mpt_alloc, key);
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kfree(mailbox);
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return err;
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}
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int mthca_mr_alloc_phys(struct mthca_dev *dev, u32 pd,
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u64 *buffer_list, int buffer_size_shift,
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int list_len, u64 iova, u64 total_size,
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u32 access, struct mthca_mr *mr)
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{
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void *mailbox;
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u64 *mtt_entry;
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struct mthca_mpt_entry *mpt_entry;
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u32 key;
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int err = -ENOMEM;
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u8 status;
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int i;
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might_sleep();
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WARN_ON(buffer_size_shift >= 32);
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key = mthca_alloc(&dev->mr_table.mpt_alloc);
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if (key == -1)
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return -ENOMEM;
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mr->ibmr.rkey = mr->ibmr.lkey = hw_index_to_key(dev, key);
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if (dev->hca_type == ARBEL_NATIVE) {
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err = mthca_table_get(dev, dev->mr_table.mpt_table, key);
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if (err)
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goto err_out_mpt_free;
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}
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for (i = MTHCA_MTT_SEG_SIZE / 8, mr->order = 0;
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i < list_len;
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i <<= 1, ++mr->order)
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; /* nothing */
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mr->first_seg = mthca_alloc_mtt(dev, mr->order,
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&dev->mr_table.mtt_buddy);
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if (mr->first_seg == -1)
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goto err_out_table;
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/*
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* If list_len is odd, we add one more dummy entry for
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* firmware efficiency.
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*/
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mailbox = kmalloc(max(sizeof *mpt_entry,
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(size_t) 8 * (list_len + (list_len & 1) + 2)) +
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MTHCA_CMD_MAILBOX_EXTRA,
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GFP_KERNEL);
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if (!mailbox)
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goto err_out_free_mtt;
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mtt_entry = MAILBOX_ALIGN(mailbox);
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mtt_entry[0] = cpu_to_be64(dev->mr_table.mtt_base +
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mr->first_seg * MTHCA_MTT_SEG_SIZE);
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mtt_entry[1] = 0;
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for (i = 0; i < list_len; ++i)
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mtt_entry[i + 2] = cpu_to_be64(buffer_list[i] |
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MTHCA_MTT_FLAG_PRESENT);
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if (list_len & 1) {
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mtt_entry[i + 2] = 0;
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++list_len;
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}
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if (0) {
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mthca_dbg(dev, "Dumping MPT entry\n");
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for (i = 0; i < list_len + 2; ++i)
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printk(KERN_ERR "[%2d] %016llx\n",
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i, (unsigned long long) be64_to_cpu(mtt_entry[i]));
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}
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err = mthca_WRITE_MTT(dev, mtt_entry, list_len, &status);
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if (err) {
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mthca_warn(dev, "WRITE_MTT failed (%d)\n", err);
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goto err_out_mailbox_free;
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}
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if (status) {
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mthca_warn(dev, "WRITE_MTT returned status 0x%02x\n",
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status);
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err = -EINVAL;
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goto err_out_mailbox_free;
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}
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mpt_entry = MAILBOX_ALIGN(mailbox);
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mpt_entry->flags = cpu_to_be32(MTHCA_MPT_FLAG_SW_OWNS |
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MTHCA_MPT_FLAG_MIO |
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MTHCA_MPT_FLAG_REGION |
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access);
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mpt_entry->page_size = cpu_to_be32(buffer_size_shift - 12);
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mpt_entry->key = cpu_to_be32(key);
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mpt_entry->pd = cpu_to_be32(pd);
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mpt_entry->start = cpu_to_be64(iova);
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mpt_entry->length = cpu_to_be64(total_size);
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memset(&mpt_entry->lkey, 0,
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sizeof *mpt_entry - offsetof(struct mthca_mpt_entry, lkey));
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mpt_entry->mtt_seg = cpu_to_be64(dev->mr_table.mtt_base +
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mr->first_seg * MTHCA_MTT_SEG_SIZE);
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if (0) {
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mthca_dbg(dev, "Dumping MPT entry %08x:\n", mr->ibmr.lkey);
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for (i = 0; i < sizeof (struct mthca_mpt_entry) / 4; ++i) {
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if (i % 4 == 0)
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printk("[%02x] ", i * 4);
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printk(" %08x", be32_to_cpu(((u32 *) mpt_entry)[i]));
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if ((i + 1) % 4 == 0)
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printk("\n");
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}
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}
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err = mthca_SW2HW_MPT(dev, mpt_entry,
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key & (dev->limits.num_mpts - 1),
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&status);
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if (err)
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mthca_warn(dev, "SW2HW_MPT failed (%d)\n", err);
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else if (status) {
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mthca_warn(dev, "SW2HW_MPT returned status 0x%02x\n",
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status);
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err = -EINVAL;
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}
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kfree(mailbox);
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return err;
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err_out_mailbox_free:
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kfree(mailbox);
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err_out_free_mtt:
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mthca_free_mtt(dev, mr->first_seg, mr->order, &dev->mr_table.mtt_buddy);
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err_out_table:
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if (dev->hca_type == ARBEL_NATIVE)
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mthca_table_put(dev, dev->mr_table.mpt_table, key);
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err_out_mpt_free:
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mthca_free(&dev->mr_table.mpt_alloc, key);
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return err;
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}
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void mthca_free_mr(struct mthca_dev *dev, struct mthca_mr *mr)
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{
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int err;
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u8 status;
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might_sleep();
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err = mthca_HW2SW_MPT(dev, NULL,
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key_to_hw_index(dev, mr->ibmr.lkey) &
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(dev->limits.num_mpts - 1),
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&status);
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if (err)
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mthca_warn(dev, "HW2SW_MPT failed (%d)\n", err);
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else if (status)
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mthca_warn(dev, "HW2SW_MPT returned status 0x%02x\n",
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status);
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if (mr->order >= 0)
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mthca_free_mtt(dev, mr->first_seg, mr->order, &dev->mr_table.mtt_buddy);
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if (dev->hca_type == ARBEL_NATIVE)
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mthca_table_put(dev, dev->mr_table.mpt_table,
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key_to_hw_index(dev, mr->ibmr.lkey));
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mthca_free(&dev->mr_table.mpt_alloc, key_to_hw_index(dev, mr->ibmr.lkey));
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}
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int __devinit mthca_init_mr_table(struct mthca_dev *dev)
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{
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int err;
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err = mthca_alloc_init(&dev->mr_table.mpt_alloc,
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dev->limits.num_mpts,
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~0, dev->limits.reserved_mrws);
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if (err)
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return err;
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err = mthca_buddy_init(&dev->mr_table.mtt_buddy,
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fls(dev->limits.num_mtt_segs - 1));
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if (err)
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goto err_mtt_buddy;
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if (dev->limits.reserved_mtts) {
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if (mthca_alloc_mtt(dev, fls(dev->limits.reserved_mtts - 1),
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&dev->mr_table.mtt_buddy) == -1) {
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mthca_warn(dev, "MTT table of order %d is too small.\n",
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dev->mr_table.mtt_buddy.max_order);
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err = -ENOMEM;
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goto err_mtt_buddy;
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}
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}
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return 0;
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err_mtt_buddy:
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mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
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return err;
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}
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void __devexit mthca_cleanup_mr_table(struct mthca_dev *dev)
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{
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/* XXX check if any MRs are still allocated? */
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mthca_buddy_cleanup(&dev->mr_table.mtt_buddy);
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mthca_alloc_cleanup(&dev->mr_table.mpt_alloc);
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}
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