drivers/infiniband/hw/mlx5/mem.c

   1 /*
   2  * Copyright (c) 2013-2015, Mellanox Technologies. 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 <rdma/ib_umem_odp.h>
  36 #include "mlx5_ib.h"
  37
  38 /* @umem: umem object to scan
  39  * @addr: ib virtual address requested by the user
  40  * @count: number of PAGE_SIZE pages covered by umem
  41  * @shift: page shift for the compound pages found in the region
  42  * @ncont: number of compund pages
  43  * @order: log2 of the number of compound pages
  44  */
  45 void mlx5_ib_cont_pages(struct ib_umem *umem, u64 addr, int *count, int *shift,
  46                         int *ncont, int *order)
  47 {
  48         unsigned long tmp;
  49         unsigned long m;
  50         int i, k;
  51         u64 base = 0;
  52         int p = 0;
  53         int skip;
  54         int mask;
  55         u64 len;
  56         u64 pfn;
  57         struct scatterlist *sg;
  58         int entry;
  59         unsigned long page_shift = ilog2(umem->page_size);
  60
  61         /* With ODP we must always match OS page size. */
  62         if (umem->odp_data) {
  63                 *count = ib_umem_page_count(umem);
  64                 *shift = PAGE_SHIFT;
  65                 *ncont = *count;
  66                 if (order)
  67                         *order = ilog2(roundup_pow_of_two(*count));
  68
  69                 return;
  70         }
  71
  72         addr = addr >> page_shift;
  73         tmp = (unsigned long)addr;
  74         m = find_first_bit(&tmp, BITS_PER_LONG);
  75         skip = 1 << m;
  76         mask = skip - 1;
  77         i = 0;
  78         for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
  79                 len = sg_dma_len(sg) >> page_shift;
  80                 pfn = sg_dma_address(sg) >> page_shift;
  81                 for (k = 0; k < len; k++) {
  82                         if (!(i & mask)) {
  83                                 tmp = (unsigned long)pfn;
  84                                 m = min_t(unsigned long, m, find_first_bit(&tmp, BITS_PER_LONG));
  85                                 skip = 1 << m;
  86                                 mask = skip - 1;
  87                                 base = pfn;
  88                                 p = 0;
  89                         } else {
  90                                 if (base + p != pfn) {
  91                                         tmp = (unsigned long)p;
  92                                         m = find_first_bit(&tmp, BITS_PER_LONG);
  93                                         skip = 1 << m;
  94                                         mask = skip - 1;
  95                                         base = pfn;
  96                                         p = 0;
  97                                 }
  98                         }
  99                         p++;
 100                         i++;
 101                 }
 102         }
 103
 104         if (i) {
 105                 m = min_t(unsigned long, ilog2(roundup_pow_of_two(i)), m);
 106
 107                 if (order)
 108                         *order = ilog2(roundup_pow_of_two(i) >> m);
 109
 110                 *ncont = DIV_ROUND_UP(i, (1 << m));
 111         } else {
 112                 m  = 0;
 113
 114                 if (order)
 115                         *order = 0;
 116
 117                 *ncont = 0;
 118         }
 119         *shift = page_shift + m;
 120         *count = i;
 121 }
 122
 123 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 124 static u64 umem_dma_to_mtt(dma_addr_t umem_dma)
 125 {
 126         u64 mtt_entry = umem_dma & ODP_DMA_ADDR_MASK;
 127
 128         if (umem_dma & ODP_READ_ALLOWED_BIT)
 129                 mtt_entry |= MLX5_IB_MTT_READ;
 130         if (umem_dma & ODP_WRITE_ALLOWED_BIT)
 131                 mtt_entry |= MLX5_IB_MTT_WRITE;
 132
 133         return mtt_entry;
 134 }
 135 #endif
 136
 137 /*
 138  * Populate the given array with bus addresses from the umem.
 139  *
 140  * dev - mlx5_ib device
 141  * umem - umem to use to fill the pages
 142  * page_shift - determines the page size used in the resulting array
 143  * offset - offset into the umem to start from,
 144  *          only implemented for ODP umems
 145  * num_pages - total number of pages to fill
 146  * pas - bus addresses array to fill
 147  * access_flags - access flags to set on all present pages.
 148                   use enum mlx5_ib_mtt_access_flags for this.
 149  */
 150 void __mlx5_ib_populate_pas(struct mlx5_ib_dev *dev, struct ib_umem *umem,
 151                             int page_shift, size_t offset, size_t num_pages,
 152                             __be64 *pas, int access_flags)
 153 {
 154         unsigned long umem_page_shift = ilog2(umem->page_size);
 155         int shift = page_shift - umem_page_shift;
 156         int mask = (1 << shift) - 1;
 157         int i, k;
 158         u64 cur = 0;
 159         u64 base;
 160         int len;
 161         struct scatterlist *sg;
 162         int entry;
 163 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
 164         const bool odp = umem->odp_data != NULL;
 165
 166         if (odp) {
 167                 WARN_ON(shift != 0);
 168                 WARN_ON(access_flags != (MLX5_IB_MTT_READ | MLX5_IB_MTT_WRITE));
 169
 170                 for (i = 0; i < num_pages; ++i) {
 171                         dma_addr_t pa = umem->odp_data->dma_list[offset + i];
 172
 173                         pas[i] = cpu_to_be64(umem_dma_to_mtt(pa));
 174                 }
 175                 return;
 176         }
 177 #endif
 178
 179         i = 0;
 180         for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
 181                 len = sg_dma_len(sg) >> umem_page_shift;
 182                 base = sg_dma_address(sg);
 183                 for (k = 0; k < len; k++) {
 184                         if (!(i & mask)) {
 185                                 cur = base + (k << umem_page_shift);
 186                                 cur |= access_flags;
 187
 188                                 pas[i >> shift] = cpu_to_be64(cur);
 189                                 mlx5_ib_dbg(dev, "pas[%d] 0x%llx\n",
 190                                             i >> shift, be64_to_cpu(pas[i >> shift]));
 191                         }  else
 192                                 mlx5_ib_dbg(dev, "=====> 0x%llx\n",
 193                                             base + (k << umem_page_shift));
 194                         i++;
 195                 }
 196         }
 197 }
 198
 199 void mlx5_ib_populate_pas(struct mlx5_ib_dev *dev, struct ib_umem *umem,
 200                           int page_shift, __be64 *pas, int access_flags)
 201 {
 202         return __mlx5_ib_populate_pas(dev, umem, page_shift, 0,
 203                                       ib_umem_num_pages(umem), pas,
 204                                       access_flags);
 205 }
 206 int mlx5_ib_get_buf_offset(u64 addr, int page_shift, u32 *offset)
 207 {
 208         u64 page_size;
 209         u64 page_mask;
 210         u64 off_size;
 211         u64 off_mask;
 212         u64 buf_off;
 213
 214         page_size = (u64)1 << page_shift;
 215         page_mask = page_size - 1;
 216         buf_off = addr & page_mask;
 217         off_size = page_size >> 6;
 218         off_mask = off_size - 1;
 219
 220         if (buf_off & off_mask)
 221                 return -EINVAL;
 222
 223         *offset = buf_off >> ilog2(off_size);
 224         return 0;
 225 }