ceph/src/seastar/dpdk/lib/librte_eal/bsdapp/contigmem/contigmem.c

   1 /*-
   2  *   BSD LICENSE
   3  *
   4  *   Copyright(c) 2010-2014 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 <sys/cdefs.h>
  35 __FBSDID("$FreeBSD$");
  36
  37 #include <sys/param.h>
  38 #include <sys/bio.h>
  39 #include <sys/bus.h>
  40 #include <sys/conf.h>
  41 #include <sys/kernel.h>
  42 #include <sys/malloc.h>
  43 #include <sys/module.h>
  44 #include <sys/proc.h>
  45 #include <sys/rwlock.h>
  46 #include <sys/systm.h>
  47 #include <sys/sysctl.h>
  48
  49 #include <machine/bus.h>
  50
  51 #include <vm/vm.h>
  52 #include <vm/pmap.h>
  53 #include <vm/vm_object.h>
  54 #include <vm/vm_page.h>
  55 #include <vm/vm_pager.h>
  56
  57 static int              contigmem_load(void);
  58 static int              contigmem_unload(void);
  59 static int              contigmem_physaddr(SYSCTL_HANDLER_ARGS);
  60
  61 static d_mmap_t         contigmem_mmap;
  62 static d_mmap_single_t  contigmem_mmap_single;
  63 static d_open_t         contigmem_open;
  64
  65 static int              contigmem_num_buffers = RTE_CONTIGMEM_DEFAULT_NUM_BUFS;
  66 static int64_t          contigmem_buffer_size = RTE_CONTIGMEM_DEFAULT_BUF_SIZE;
  67
  68 static eventhandler_tag contigmem_eh_tag;
  69 static void            *contigmem_buffers[RTE_CONTIGMEM_MAX_NUM_BUFS];
  70 static struct cdev     *contigmem_cdev = NULL;
  71
  72 TUNABLE_INT("hw.contigmem.num_buffers", &contigmem_num_buffers);
  73 TUNABLE_QUAD("hw.contigmem.buffer_size", &contigmem_buffer_size);
  74
  75 static SYSCTL_NODE(_hw, OID_AUTO, contigmem, CTLFLAG_RD, 0, "contigmem");
  76
  77 SYSCTL_INT(_hw_contigmem, OID_AUTO, num_buffers, CTLFLAG_RD,
  78         &contigmem_num_buffers, 0, "Number of contigmem buffers allocated");
  79 SYSCTL_QUAD(_hw_contigmem, OID_AUTO, buffer_size, CTLFLAG_RD,
  80         &contigmem_buffer_size, 0, "Size of each contiguous buffer");
  81
  82 static SYSCTL_NODE(_hw_contigmem, OID_AUTO, physaddr, CTLFLAG_RD, 0,
  83         "physaddr");
  84
  85 MALLOC_DEFINE(M_CONTIGMEM, "contigmem", "contigmem(4) allocations");
  86
  87 static int contigmem_modevent(module_t mod, int type, void *arg)
  88 {
  89         int error = 0;
  90
  91         switch (type) {
  92         case MOD_LOAD:
  93                 error = contigmem_load();
  94                 break;
  95         case MOD_UNLOAD:
  96                 error = contigmem_unload();
  97                 break;
  98         default:
  99                 break;
 100         }
 101
 102         return error;
 103 }
 104
 105 moduledata_t contigmem_mod = {
 106         "contigmem",
 107         (modeventhand_t)contigmem_modevent,
 108         0
 109 };
 110
 111 DECLARE_MODULE(contigmem, contigmem_mod, SI_SUB_DRIVERS, SI_ORDER_ANY);
 112 MODULE_VERSION(contigmem, 1);
 113
 114 static struct cdevsw contigmem_ops = {
 115         .d_name         = "contigmem",
 116         .d_version      = D_VERSION,
 117         .d_mmap         = contigmem_mmap,
 118         .d_mmap_single  = contigmem_mmap_single,
 119         .d_open         = contigmem_open,
 120 };
 121
 122 static int
 123 contigmem_load()
 124 {
 125         char index_string[8], description[32];
 126         int  i;
 127
 128         if (contigmem_num_buffers > RTE_CONTIGMEM_MAX_NUM_BUFS) {
 129                 printf("%d buffers requested is greater than %d allowed\n",
 130                                 contigmem_num_buffers, RTE_CONTIGMEM_MAX_NUM_BUFS);
 131                 return EINVAL;
 132         }
 133
 134         if (contigmem_buffer_size < PAGE_SIZE ||
 135                         (contigmem_buffer_size & (contigmem_buffer_size - 1)) != 0) {
 136                 printf("buffer size 0x%lx is not greater than PAGE_SIZE and "
 137                                 "power of two\n", contigmem_buffer_size);
 138                 return EINVAL;
 139         }
 140
 141         for (i = 0; i < contigmem_num_buffers; i++) {
 142                 contigmem_buffers[i] =
 143                                 contigmalloc(contigmem_buffer_size, M_CONTIGMEM, M_ZERO, 0,
 144                         BUS_SPACE_MAXADDR, contigmem_buffer_size, 0);
 145
 146                 if (contigmem_buffers[i] == NULL) {
 147                         printf("contigmalloc failed for buffer %d\n", i);
 148                         return ENOMEM;
 149                 }
 150
 151                 printf("%2u: virt=%p phys=%p\n", i, contigmem_buffers[i],
 152                                 (void *)pmap_kextract((vm_offset_t)contigmem_buffers[i]));
 153
 154                 snprintf(index_string, sizeof(index_string), "%d", i);
 155                 snprintf(description, sizeof(description),
 156                                 "phys addr for buffer %d", i);
 157                 SYSCTL_ADD_PROC(NULL,
 158                                 &SYSCTL_NODE_CHILDREN(_hw_contigmem, physaddr), OID_AUTO,
 159                                 index_string, CTLTYPE_U64 | CTLFLAG_RD,
 160                                 (void *)(uintptr_t)i, 0, contigmem_physaddr, "LU",
 161                                 description);
 162         }
 163
 164         contigmem_cdev = make_dev_credf(0, &contigmem_ops, 0, NULL, UID_ROOT,
 165                         GID_WHEEL, 0600, "contigmem");
 166
 167         return 0;
 168 }
 169
 170 static int
 171 contigmem_unload()
 172 {
 173         int i;
 174
 175         if (contigmem_cdev != NULL)
 176                 destroy_dev(contigmem_cdev);
 177
 178         if (contigmem_eh_tag != NULL)
 179                 EVENTHANDLER_DEREGISTER(process_exit, contigmem_eh_tag);
 180
 181         for (i = 0; i < RTE_CONTIGMEM_MAX_NUM_BUFS; i++)
 182                 if (contigmem_buffers[i] != NULL)
 183                         contigfree(contigmem_buffers[i], contigmem_buffer_size,
 184                                         M_CONTIGMEM);
 185
 186         return 0;
 187 }
 188
 189 static int
 190 contigmem_physaddr(SYSCTL_HANDLER_ARGS)
 191 {
 192         uint64_t        physaddr;
 193         int             index = (int)(uintptr_t)arg1;
 194
 195         physaddr = (uint64_t)vtophys(contigmem_buffers[index]);
 196         return sysctl_handle_64(oidp, &physaddr, 0, req);
 197 }
 198
 199 static int
 200 contigmem_open(struct cdev *cdev, int fflags, int devtype,
 201                 struct thread *td)
 202 {
 203         return 0;
 204 }
 205
 206 static int
 207 contigmem_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
 208                 int prot, vm_memattr_t *memattr)
 209 {
 210
 211         *paddr = offset;
 212         return 0;
 213 }
 214
 215 static int
 216 contigmem_mmap_single(struct cdev *cdev, vm_ooffset_t *offset, vm_size_t size,
 217                 struct vm_object **obj, int nprot)
 218 {
 219         uint64_t buffer_index;
 220
 221         /*
 222          * The buffer index is encoded in the offset.  Divide the offset by
 223          *  PAGE_SIZE to get the index of the buffer requested by the user
 224          *  app.
 225          */
 226         buffer_index = *offset / PAGE_SIZE;
 227         if (buffer_index >= contigmem_num_buffers)
 228                 return EINVAL;
 229
 230         memset(contigmem_buffers[buffer_index], 0, contigmem_buffer_size);
 231         *offset = (vm_ooffset_t)vtophys(contigmem_buffers[buffer_index]);
 232         *obj = vm_pager_allocate(OBJT_DEVICE, cdev, size, nprot, *offset,
 233                         curthread->td_ucred);
 234
 235         return 0;
 236 }