drivers/infiniband/hw/mlx5/mem.c

   1 /*
   2  * Copyright (c) 2013, Mellanox Technologies inc.  All rights reserved.
   3  *
   4  * This software is available to you under a choice of one of two
   5  * licenses.  You may choose to be licensed under the terms of the GNU
   6  * General Public License (GPL) Version 2, available from the file
   7  * COPYING in the main directory of this source tree, or the
   8  * OpenIB.org BSD license below:
   9  *
  10  *     Redistribution and use in source and binary forms, with or
  11  *     without modification, are permitted provided that the following
  12  *     conditions are met:
  13  *
  14  *      - Redistributions of source code must retain the above
  15  *        copyright notice, this list of conditions and the following
  16  *        disclaimer.
  17  *
  18  *      - Redistributions in binary form must reproduce the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer in the documentation and/or other materials
  21  *        provided with the distribution.
  22  *
  23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  30  * SOFTWARE.
  31  */
  32
  33 #include <linux/module.h>
  34 #include <rdma/ib_umem.h>
  35 #include "mlx5_ib.h"
  36
  37 /* @umem: umem object to scan
  38  * @addr: ib virtual address requested by the user
  39  * @count: number of PAGE_SIZE pages covered by umem
  40  * @shift: page shift for the compound pages found in the region
  41  * @ncont: number of compund pages
  42  * @order: log2 of the number of compound pages
  43  */
  44 void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr, int *count, int *shift,
  45                         int *ncont, int *order)
  46 {
  47         struct ib_umem_chunk *chunk;
  48         unsigned long tmp;
  49         unsigned long m;
  50         int i, j, k;
  51         u64 base = 0;
  52         int p = 0;
  53         int skip;
  54         int mask;
  55         u64 len;
  56         u64 pfn;
  57
  58         addr = addr >> PAGE_SHIFT;
  59         tmp = (unsigned long)addr;
  60         m = find_first_bit(&tmp, sizeof(tmp));
  61         skip = 1 << m;
  62         mask = skip - 1;
  63         i = 0;
  64         list_for_each_entry(chunk, &umem->chunk_list, list)
  65                 for (j = 0; j < chunk->nmap; j++) {
  66                         len = sg_dma_len(&chunk->page_list[j]) >> PAGE_SHIFT;
  67                         pfn = sg_dma_address(&chunk->page_list[j]) >> PAGE_SHIFT;
  68                         for (k = 0; k < len; k++) {
  69                                 if (!(i & mask)) {
  70                                         tmp = (unsigned long)pfn;
  71                                         m = min(m, find_first_bit(&tmp, sizeof(tmp)));
  72                                         skip = 1 << m;
  73                                         mask = skip - 1;
  74                                         base = pfn;
  75                                         p = 0;
  76                                 } else {
  77                                         if (base + p != pfn) {
  78                                                 tmp = (unsigned long)p;
  79                                                 m = find_first_bit(&tmp, sizeof(tmp));
  80                                                 skip = 1 << m;
  81                                                 mask = skip - 1;
  82                                                 base = pfn;
  83                                                 p = 0;
  84                                         }
  85                                 }
  86                                 p++;
  87                                 i++;
  88                         }
  89                 }
  90
  91         if (i) {
  92                 m = min_t(unsigned long, ilog2(roundup_pow_of_two(i)), m);
  93
  94                 if (order)
  95                         *order = ilog2(roundup_pow_of_two(i) >> m);
  96
  97                 *ncont = DIV_ROUND_UP(i, (1 << m));
  98         } else {
  99                 m  = 0;
 100
 101                 if (order)
 102                         *order = 0;
 103
 104                 *ncont = 0;
 105         }
 106         *shift = PAGE_SHIFT + m;
 107         *count = i;
 108 }
 109
 110 void mlx5_ib_populate_pas(struct mlx5_ib_dev *dev, struct ib_umem *umem,
 111                           int page_shift, __be64 *pas, int umr)
 112 {
 113         int shift = page_shift - PAGE_SHIFT;
 114         int mask = (1 << shift) - 1;
 115         struct ib_umem_chunk *chunk;
 116         int i, j, k;
 117         u64 cur = 0;
 118         u64 base;
 119         int len;
 120
 121         i = 0;
 122         list_for_each_entry(chunk, &umem->chunk_list, list)
 123                 for (j = 0; j < chunk->nmap; j++) {
 124                         len = sg_dma_len(&chunk->page_list[j]) >> PAGE_SHIFT;
 125                         base = sg_dma_address(&chunk->page_list[j]);
 126                         for (k = 0; k < len; k++) {
 127                                 if (!(i & mask)) {
 128                                         cur = base + (k << PAGE_SHIFT);
 129                                         if (umr)
 130                                                 cur |= 3;
 131
 132                                         pas[i >> shift] = cpu_to_be64(cur);
 133                                         mlx5_ib_dbg(dev, "pas[%d] 0x%llx\n",
 134                                                     i >> shift, be64_to_cpu(pas[i >> shift]));
 135                                 }  else
 136                                         mlx5_ib_dbg(dev, "=====> 0x%llx\n",
 137                                                     base + (k << PAGE_SHIFT));
 138                                 i++;
 139                         }
 140                 }
 141 }
 142
 143 int mlx5_ib_get_buf_offset(u64 addr, int page_shift, u32 *offset)
 144 {
 145         u64 page_size;
 146         u64 page_mask;
 147         u64 off_size;
 148         u64 off_mask;
 149         u64 buf_off;
 150
 151         page_size = 1 << page_shift;
 152         page_mask = page_size - 1;
 153         buf_off = addr & page_mask;
 154         off_size = page_size >> 6;
 155         off_mask = off_size - 1;
 156
 157         if (buf_off & off_mask)
 158                 return -EINVAL;
 159
 160         *offset = buf_off >> ilog2(off_size);
 161         return 0;
 162 }