/*
* Copyright (c) 2013-2015, Mellanox Technologies. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <rdma/ib_umem_odp.h>
#include "mlx5_ib.h"
/*
* Fill in a physical address list. ib_umem_num_dma_blocks() entries will be
* filled in the pas array.
*/
void mlx5_ib_populate_pas(struct ib_umem *umem, size_t page_size, __be64 *pas,
u64 access_flags)
{
struct ib_block_iter biter;
rdma_umem_for_each_dma_block (umem, &biter, page_size) {
*pas = cpu_to_be64(rdma_block_iter_dma_address(&biter) |
access_flags);
pas++;
}
}
/*
* Compute the page shift and page_offset for mailboxes that use a quantized
* page_offset. The granulatity of the page offset scales according to page
* size.
*/
unsigned long __mlx5_umem_find_best_quantized_pgoff(
struct ib_umem *umem, unsigned long pgsz_bitmap,
unsigned int page_offset_bits, u64 pgoff_bitmask, unsigned int scale,
unsigned int *page_offset_quantized)
{
const u64 page_offset_mask = (1UL << page_offset_bits) - 1;
unsigned long page_size;
u64 page_offset;
page_size = ib_umem_find_best_pgoff(umem, pgsz_bitmap, pgoff_bitmask);
if (!page_size)
return 0;
/*
* page size is the largest possible page size.
*
* Reduce the page_size, and thus the page_offset and quanta, until the
* page_offset fits into the mailbox field. Once page_size < scale this
* loop is guaranteed to terminate.
*/
page_offset = ib_umem_dma_offset(umem, page_size);
while (page_offset & ~(u64)(page_offset_mask * (page_size / scale))) {
page_size /= 2;
page_offset = ib_umem_dma_offset(umem, page_size);
}
/*
* The address is not aligned, or otherwise cannot be represented by the
* page_offset.
*/
if (!(pgsz_bitmap & page_size))
return 0;
*page_offset_quantized =
(unsigned long)page_offset / (page_size / scale);
if (WARN_ON(*page_offset_quantized > page_offset_mask))
return 0;
return page_size;
}
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