165 lines
4.2 KiB
C
165 lines
4.2 KiB
C
/*
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* Copyright (c) 2013, Mellanox Technologies 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/module.h>
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#include <rdma/ib_umem.h>
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#include "mlx5_ib.h"
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/* @umem: umem object to scan
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* @addr: ib virtual address requested by the user
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* @count: number of PAGE_SIZE pages covered by umem
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* @shift: page shift for the compound pages found in the region
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* @ncont: number of compund pages
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* @order: log2 of the number of compound pages
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*/
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void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr, int *count, int *shift,
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int *ncont, int *order)
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{
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unsigned long tmp;
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unsigned long m;
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int i, k;
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u64 base = 0;
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int p = 0;
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int skip;
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int mask;
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u64 len;
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u64 pfn;
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struct scatterlist *sg;
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int entry;
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unsigned long page_shift = ilog2(umem->page_size);
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addr = addr >> page_shift;
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tmp = (unsigned long)addr;
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m = find_first_bit(&tmp, sizeof(tmp));
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skip = 1 << m;
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mask = skip - 1;
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i = 0;
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for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
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len = sg_dma_len(sg) >> page_shift;
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pfn = sg_dma_address(sg) >> page_shift;
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for (k = 0; k < len; k++) {
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if (!(i & mask)) {
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tmp = (unsigned long)pfn;
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m = min(m, find_first_bit(&tmp, sizeof(tmp)));
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skip = 1 << m;
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mask = skip - 1;
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base = pfn;
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p = 0;
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} else {
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if (base + p != pfn) {
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tmp = (unsigned long)p;
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m = find_first_bit(&tmp, sizeof(tmp));
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skip = 1 << m;
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mask = skip - 1;
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base = pfn;
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p = 0;
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}
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}
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p++;
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i++;
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}
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}
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if (i) {
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m = min_t(unsigned long, ilog2(roundup_pow_of_two(i)), m);
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if (order)
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*order = ilog2(roundup_pow_of_two(i) >> m);
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*ncont = DIV_ROUND_UP(i, (1 << m));
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} else {
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m = 0;
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if (order)
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*order = 0;
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*ncont = 0;
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}
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*shift = page_shift + m;
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*count = i;
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}
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void mlx5_ib_populate_pas(struct mlx5_ib_dev *dev, struct ib_umem *umem,
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int page_shift, __be64 *pas, int umr)
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{
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unsigned long umem_page_shift = ilog2(umem->page_size);
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int shift = page_shift - umem_page_shift;
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int mask = (1 << shift) - 1;
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int i, k;
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u64 cur = 0;
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u64 base;
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int len;
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struct scatterlist *sg;
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int entry;
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i = 0;
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for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
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len = sg_dma_len(sg) >> umem_page_shift;
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base = sg_dma_address(sg);
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for (k = 0; k < len; k++) {
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if (!(i & mask)) {
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cur = base + (k << umem_page_shift);
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if (umr)
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cur |= 3;
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pas[i >> shift] = cpu_to_be64(cur);
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mlx5_ib_dbg(dev, "pas[%d] 0x%llx\n",
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i >> shift, be64_to_cpu(pas[i >> shift]));
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} else
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mlx5_ib_dbg(dev, "=====> 0x%llx\n",
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base + (k << umem_page_shift));
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i++;
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}
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}
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}
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int mlx5_ib_get_buf_offset(u64 addr, int page_shift, u32 *offset)
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{
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u64 page_size;
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u64 page_mask;
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u64 off_size;
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u64 off_mask;
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u64 buf_off;
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page_size = (u64)1 << page_shift;
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page_mask = page_size - 1;
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buf_off = addr & page_mask;
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off_size = page_size >> 6;
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off_mask = off_size - 1;
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if (buf_off & off_mask)
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return -EINVAL;
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*offset = buf_off >> ilog2(off_size);
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return 0;
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}
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