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