mlx5_ib_mem.c

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    1 /*-
    2  * Copyright (c) 2013-2020, Mellanox Technologies, Ltd.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  *
   13  * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS `AS IS' AND
   14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   16  * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   23  * SUCH DAMAGE.
   24  *
   25  * $FreeBSD$
   26  */
   27 
   28 #include "opt_rss.h"
   29 #include "opt_ratelimit.h"
   30 
   31 #include <linux/module.h>
   32 #include <rdma/ib_umem.h>
   33 #include <rdma/ib_umem_odp.h>
   34 #include <dev/mlx5/mlx5_ib/mlx5_ib.h>
   35 
   36 /* @umem: umem object to scan
   37  * @addr: ib virtual address requested by the user
   38  * @max_page_shift: high limit for page_shift - 0 means no limit
   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,
   45                         unsigned long max_page_shift,
   46                         int *count, int *shift,
   47                         int *ncont, int *order)
   48 {
   49         unsigned long tmp;
   50         unsigned long m;
   51         u64 base = ~0, p = 0;
   52         u64 len, pfn;
   53         int i = 0;
   54         struct scatterlist *sg;
   55         int entry;
   56 
   57         addr = addr >> PAGE_SHIFT;
   58         tmp = (unsigned long)addr;
   59         m = find_first_bit(&tmp, BITS_PER_LONG);
   60         if (max_page_shift)
   61                 m = min_t(unsigned long, max_page_shift - PAGE_SHIFT, m);
   62 
   63         for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
   64                 len = sg_dma_len(sg) >> PAGE_SHIFT;
   65                 pfn = sg_dma_address(sg) >> PAGE_SHIFT;
   66                 if (base + p != pfn) {
   67                         /* If either the offset or the new
   68                          * base are unaligned update m
   69                          */
   70                         tmp = (unsigned long)(pfn | p);
   71                         if (!IS_ALIGNED(tmp, 1 << m))
   72                                 m = find_first_bit(&tmp, BITS_PER_LONG);
   73 
   74                         base = pfn;
   75                         p = 0;
   76                 }
   77 
   78                 p += len;
   79                 i += len;
   80         }
   81 
   82         if (i) {
   83                 m = min_t(unsigned long, ilog2(roundup_pow_of_two(i)), m);
   84 
   85                 if (order)
   86                         *order = ilog2(roundup_pow_of_two(i) >> m);
   87 
   88                 *ncont = DIV_ROUND_UP(i, (1 << m));
   89         } else {
   90                 m  = 0;
   91 
   92                 if (order)
   93                         *order = 0;
   94 
   95                 *ncont = 0;
   96         }
   97         *shift = PAGE_SHIFT + m;
   98         *count = i;
   99 }
  100 
  101 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
  102 static u64 umem_dma_to_mtt(dma_addr_t umem_dma)
  103 {
  104         u64 mtt_entry = umem_dma & ODP_DMA_ADDR_MASK;
  105 
  106         if (umem_dma & ODP_READ_ALLOWED_BIT)
  107                 mtt_entry |= MLX5_IB_MTT_READ;
  108         if (umem_dma & ODP_WRITE_ALLOWED_BIT)
  109                 mtt_entry |= MLX5_IB_MTT_WRITE;
  110 
  111         return mtt_entry;
  112 }
  113 #endif
  114 
  115 /*
  116  * Populate the given array with bus addresses from the umem.
  117  *
  118  * dev - mlx5_ib device
  119  * umem - umem to use to fill the pages
  120  * page_shift - determines the page size used in the resulting array
  121  * offset - offset into the umem to start from,
  122  *          only implemented for ODP umems
  123  * num_pages - total number of pages to fill
  124  * pas - bus addresses array to fill
  125  * access_flags - access flags to set on all present pages.
  126                   use enum mlx5_ib_mtt_access_flags for this.
  127  */
  128 void __mlx5_ib_populate_pas(struct mlx5_ib_dev *dev, struct ib_umem *umem,
  129                             int page_shift, size_t offset, size_t num_pages,
  130                             __be64 *pas, int access_flags)
  131 {
  132         unsigned long umem_page_shift = ilog2(umem->page_size);
  133         int shift = page_shift - umem_page_shift;
  134         int mask = (1 << shift) - 1;
  135         int i, k;
  136         u64 cur = 0;
  137         u64 base;
  138         int len;
  139         struct scatterlist *sg;
  140         int entry;
  141 #ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
  142         const bool odp = umem->odp_data != NULL;
  143 
  144         if (odp) {
  145                 WARN_ON(shift != 0);
  146                 WARN_ON(access_flags != (MLX5_IB_MTT_READ | MLX5_IB_MTT_WRITE));
  147 
  148                 for (i = 0; i < num_pages; ++i) {
  149                         dma_addr_t pa = umem->odp_data->dma_list[offset + i];
  150 
  151                         pas[i] = cpu_to_be64(umem_dma_to_mtt(pa));
  152                 }
  153                 return;
  154         }
  155 #endif
  156 
  157         i = 0;
  158         for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
  159                 len = sg_dma_len(sg) >> umem_page_shift;
  160                 base = sg_dma_address(sg);
  161                 for (k = 0; k < len; k++) {
  162                         if (!(i & mask)) {
  163                                 cur = base + (k << umem_page_shift);
  164                                 cur |= access_flags;
  165 
  166                                 pas[i >> shift] = cpu_to_be64(cur);
  167                                 mlx5_ib_dbg(dev, "pas[%d] 0x%llx\n",
  168                                             i >> shift, (long long)be64_to_cpu(pas[i >> shift]));
  169                         }  else
  170                                 mlx5_ib_dbg(dev, "=====> 0x%llx\n",
  171                                             (long long)(base + (k << umem_page_shift)));
  172                         i++;
  173                 }
  174         }
  175 }
  176 
  177 void mlx5_ib_populate_pas(struct mlx5_ib_dev *dev, struct ib_umem *umem,
  178                           int page_shift, __be64 *pas, int access_flags)
  179 {
  180         return __mlx5_ib_populate_pas(dev, umem, page_shift, 0,
  181                                       ib_umem_num_pages(umem), pas,
  182                                       access_flags);
  183 }
  184 int mlx5_ib_get_buf_offset(u64 addr, int page_shift, u32 *offset)
  185 {
  186         u64 page_size;
  187         u64 page_mask;
  188         u64 off_size;
  189         u64 off_mask;
  190         u64 buf_off;
  191 
  192         page_size = (u64)1 << page_shift;
  193         page_mask = page_size - 1;
  194         buf_off = addr & page_mask;
  195         off_size = page_size >> 6;
  196         off_mask = off_size - 1;
  197 
  198         if (buf_off & off_mask)
  199                 return -EINVAL;
  200 
  201         *offset = buf_off >> ilog2(off_size);
  202         return 0;
  203 }

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FreeBSD/Linux Kernel Cross Reference sys/dev/mlx5/mlx5_ib/mlx5_ib_mem.c

FreeBSD/Linux Kernel Cross Reference
sys/dev/mlx5/mlx5_ib/mlx5_ib_mem.c