ceph/src/seastar/dpdk/lib/librte_eal/common/eal_common_pci_uio.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2015 Intel Corporation. All rights reserved.
   5  *   All rights reserved.
   6  *
   7  *   Redistribution and use in source and binary forms, with or without
   8  *   modification, are permitted provided that the following conditions
   9  *   are met:
  10  *
  11  *     * Redistributions of source code must retain the above copyright
  12  *       notice, this list of conditions and the following disclaimer.
  13  *     * Redistributions in binary form must reproduce the above copyright
  14  *       notice, this list of conditions and the following disclaimer in
  15  *       the documentation and/or other materials provided with the
  16  *       distribution.
  17  *     * Neither the name of Intel Corporation nor the names of its
  18  *       contributors may be used to endorse or promote products derived
  19  *       from this software without specific prior written permission.
  20  *
  21  *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24  *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25  *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26  *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  27  *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  28  *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  29  *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30  *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32  */
  33
  34 #include <fcntl.h>
  35 #include <string.h>
  36 #include <unistd.h>
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <sys/mman.h>
  40
  41 #include <rte_eal.h>
  42 #include <rte_tailq.h>
  43 #include <rte_log.h>
  44 #include <rte_malloc.h>
  45
  46 #include "eal_private.h"
  47
  48 static struct rte_tailq_elem rte_uio_tailq = {
  49         .name = "UIO_RESOURCE_LIST",
  50 };
  51 EAL_REGISTER_TAILQ(rte_uio_tailq)
  52
  53 static int
  54 pci_uio_map_secondary(struct rte_pci_device *dev)
  55 {
  56         int fd, i, j;
  57         struct mapped_pci_resource *uio_res;
  58         struct mapped_pci_res_list *uio_res_list =
  59                         RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
  60
  61         TAILQ_FOREACH(uio_res, uio_res_list, next) {
  62
  63                 /* skip this element if it doesn't match our PCI address */
  64                 if (rte_eal_compare_pci_addr(&uio_res->pci_addr, &dev->addr))
  65                         continue;
  66
  67                 for (i = 0; i != uio_res->nb_maps; i++) {
  68                         /*
  69                          * open devname, to mmap it
  70                          */
  71                         fd = open(uio_res->maps[i].path, O_RDWR);
  72                         if (fd < 0) {
  73                                 RTE_LOG(ERR, EAL, "Cannot open %s: %s\n",
  74                                         uio_res->maps[i].path, strerror(errno));
  75                                 return -1;
  76                         }
  77
  78                         void *mapaddr = pci_map_resource(uio_res->maps[i].addr,
  79                                         fd, (off_t)uio_res->maps[i].offset,
  80                                         (size_t)uio_res->maps[i].size, 0);
  81                         /* fd is not needed in slave process, close it */
  82                         close(fd);
  83                         if (mapaddr != uio_res->maps[i].addr) {
  84                                 RTE_LOG(ERR, EAL,
  85                                         "Cannot mmap device resource file %s to address: %p\n",
  86                                         uio_res->maps[i].path,
  87                                         uio_res->maps[i].addr);
  88                                 if (mapaddr != MAP_FAILED) {
  89                                         /* unmap addrs correctly mapped */
  90                                         for (j = 0; j < i; j++)
  91                                                 pci_unmap_resource(
  92                                                         uio_res->maps[j].addr,
  93                                                         (size_t)uio_res->maps[j].size);
  94                                         /* unmap addr wrongly mapped */
  95                                         pci_unmap_resource(mapaddr,
  96                                                 (size_t)uio_res->maps[i].size);
  97                                 }
  98                                 return -1;
  99                         }
 100                 }
 101                 return 0;
 102         }
 103
 104         RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
 105         return 1;
 106 }
 107
 108 /* map the PCI resource of a PCI device in virtual memory */
 109 int
 110 pci_uio_map_resource(struct rte_pci_device *dev)
 111 {
 112         int i, map_idx = 0, ret;
 113         uint64_t phaddr;
 114         struct mapped_pci_resource *uio_res = NULL;
 115         struct mapped_pci_res_list *uio_res_list =
 116                 RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
 117
 118         dev->intr_handle.fd = -1;
 119         dev->intr_handle.uio_cfg_fd = -1;
 120         dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
 121
 122         /* secondary processes - use already recorded details */
 123         if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 124                 return pci_uio_map_secondary(dev);
 125
 126         /* allocate uio resource */
 127         ret = pci_uio_alloc_resource(dev, &uio_res);
 128         if (ret)
 129                 return ret;
 130
 131         /* Map all BARs */
 132         for (i = 0; i != PCI_MAX_RESOURCE; i++) {
 133                 /* skip empty BAR */
 134                 phaddr = dev->mem_resource[i].phys_addr;
 135                 if (phaddr == 0)
 136                         continue;
 137
 138                 ret = pci_uio_map_resource_by_index(dev, i,
 139                                 uio_res, map_idx);
 140                 if (ret)
 141                         goto error;
 142
 143                 map_idx++;
 144         }
 145
 146         uio_res->nb_maps = map_idx;
 147
 148         TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
 149
 150         return 0;
 151 error:
 152         for (i = 0; i < map_idx; i++) {
 153                 pci_unmap_resource(uio_res->maps[i].addr,
 154                                 (size_t)uio_res->maps[i].size);
 155                 rte_free(uio_res->maps[i].path);
 156         }
 157         pci_uio_free_resource(dev, uio_res);
 158         return -1;
 159 }
 160
 161 static void
 162 pci_uio_unmap(struct mapped_pci_resource *uio_res)
 163 {
 164         int i;
 165
 166         if (uio_res == NULL)
 167                 return;
 168
 169         for (i = 0; i != uio_res->nb_maps; i++) {
 170                 pci_unmap_resource(uio_res->maps[i].addr,
 171                                 (size_t)uio_res->maps[i].size);
 172                 if (rte_eal_process_type() == RTE_PROC_PRIMARY)
 173                         rte_free(uio_res->maps[i].path);
 174         }
 175 }
 176
 177 static struct mapped_pci_resource *
 178 pci_uio_find_resource(struct rte_pci_device *dev)
 179 {
 180         struct mapped_pci_resource *uio_res;
 181         struct mapped_pci_res_list *uio_res_list =
 182                         RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
 183
 184         if (dev == NULL)
 185                 return NULL;
 186
 187         TAILQ_FOREACH(uio_res, uio_res_list, next) {
 188
 189                 /* skip this element if it doesn't match our PCI address */
 190                 if (!rte_eal_compare_pci_addr(&uio_res->pci_addr, &dev->addr))
 191                         return uio_res;
 192         }
 193         return NULL;
 194 }
 195
 196 /* unmap the PCI resource of a PCI device in virtual memory */
 197 void
 198 pci_uio_unmap_resource(struct rte_pci_device *dev)
 199 {
 200         struct mapped_pci_resource *uio_res;
 201         struct mapped_pci_res_list *uio_res_list =
 202                         RTE_TAILQ_CAST(rte_uio_tailq.head, mapped_pci_res_list);
 203
 204         if (dev == NULL)
 205                 return;
 206
 207         /* find an entry for the device */
 208         uio_res = pci_uio_find_resource(dev);
 209         if (uio_res == NULL)
 210                 return;
 211
 212         /* secondary processes - just free maps */
 213         if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 214                 return pci_uio_unmap(uio_res);
 215
 216         TAILQ_REMOVE(uio_res_list, uio_res, next);
 217
 218         /* unmap all resources */
 219         pci_uio_unmap(uio_res);
 220
 221         /* free uio resource */
 222         rte_free(uio_res);
 223
 224         /* close fd if in primary process */
 225         close(dev->intr_handle.fd);
 226         if (dev->intr_handle.uio_cfg_fd >= 0) {
 227                 close(dev->intr_handle.uio_cfg_fd);
 228                 dev->intr_handle.uio_cfg_fd = -1;
 229         }
 230
 231         dev->intr_handle.fd = -1;
 232         dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
 233 }