module/splat/splat-atomic.c

   1 /*****************************************************************************\
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *  For details, see <http://github.com/behlendorf/spl/>.
  10  *
  11  *  The SPL is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  23  *****************************************************************************
  24  *  Solaris Porting LAyer Tests (SPLAT) Atomic Tests.
  25 \*****************************************************************************/
  26
  27 #include "splat-internal.h"
  28
  29 #define SPLAT_ATOMIC_NAME               "atomic"
  30 #define SPLAT_ATOMIC_DESC               "Kernel Atomic Tests"
  31
  32 #define SPLAT_ATOMIC_TEST1_ID           0x0b01
  33 #define SPLAT_ATOMIC_TEST1_NAME         "64-bit"
  34 #define SPLAT_ATOMIC_TEST1_DESC         "Validate 64-bit atomic ops"
  35
  36 #define SPLAT_ATOMIC_TEST_MAGIC         0x43435454UL
  37 #define SPLAT_ATOMIC_INIT_VALUE         10000000UL
  38
  39 typedef enum {
  40         SPLAT_ATOMIC_INC_64    = 0,
  41         SPLAT_ATOMIC_DEC_64    = 1,
  42         SPLAT_ATOMIC_ADD_64    = 2,
  43         SPLAT_ATOMIC_SUB_64    = 3,
  44         SPLAT_ATOMIC_ADD_64_NV = 4,
  45         SPLAT_ATOMIC_SUB_64_NV = 5,
  46         SPLAT_ATOMIC_COUNT_64  = 6
  47 } atomic_op_t;
  48
  49 typedef struct atomic_priv {
  50         unsigned long ap_magic;
  51         struct file *ap_file;
  52         spinlock_t ap_lock;
  53         wait_queue_head_t ap_waitq;
  54         volatile uint64_t ap_atomic;
  55         volatile uint64_t ap_atomic_exited;
  56         atomic_op_t ap_op;
  57
  58 } atomic_priv_t;
  59
  60 static void
  61 splat_atomic_work(void *priv)
  62 {
  63         atomic_priv_t *ap;
  64         atomic_op_t op;
  65         int i;
  66
  67         ap = (atomic_priv_t *)priv;
  68         ASSERT(ap->ap_magic == SPLAT_ATOMIC_TEST_MAGIC);
  69
  70         spin_lock(&ap->ap_lock);
  71         op = ap->ap_op;
  72         wake_up(&ap->ap_waitq);
  73         spin_unlock(&ap->ap_lock);
  74
  75         splat_vprint(ap->ap_file, SPLAT_ATOMIC_TEST1_NAME,
  76                      "Thread %d successfully started: %lu/%lu\n", op,
  77                      (long unsigned)ap->ap_atomic,
  78                      (long unsigned)ap->ap_atomic_exited);
  79
  80         for (i = 0; i < SPLAT_ATOMIC_INIT_VALUE / 10; i++) {
  81
  82                 /* Periodically sleep to mix up the ordering */
  83                 if ((i % (SPLAT_ATOMIC_INIT_VALUE / 100)) == 0) {
  84                         splat_vprint(ap->ap_file, SPLAT_ATOMIC_TEST1_NAME,
  85                              "Thread %d sleeping: %lu/%lu\n", op,
  86                              (long unsigned)ap->ap_atomic,
  87                              (long unsigned)ap->ap_atomic_exited);
  88                         set_current_state(TASK_INTERRUPTIBLE);
  89                         schedule_timeout(HZ / 100);
  90                 }
  91
  92                 switch (op) {
  93                         case SPLAT_ATOMIC_INC_64:
  94                                 atomic_inc_64(&ap->ap_atomic);
  95                                 break;
  96                         case SPLAT_ATOMIC_DEC_64:
  97                                 atomic_dec_64(&ap->ap_atomic);
  98                                 break;
  99                         case SPLAT_ATOMIC_ADD_64:
 100                                 atomic_add_64(&ap->ap_atomic, 3);
 101                                 break;
 102                         case SPLAT_ATOMIC_SUB_64:
 103                                 atomic_sub_64(&ap->ap_atomic, 3);
 104                                 break;
 105                         case SPLAT_ATOMIC_ADD_64_NV:
 106                                 atomic_add_64_nv(&ap->ap_atomic, 5);
 107                                 break;
 108                         case SPLAT_ATOMIC_SUB_64_NV:
 109                                 atomic_sub_64_nv(&ap->ap_atomic, 5);
 110                                 break;
 111                         default:
 112                                 SBUG();
 113                 }
 114         }
 115
 116         atomic_inc_64(&ap->ap_atomic_exited);
 117
 118         splat_vprint(ap->ap_file, SPLAT_ATOMIC_TEST1_NAME,
 119                      "Thread %d successfully exited: %lu/%lu\n", op,
 120                      (long unsigned)ap->ap_atomic,
 121                      (long unsigned)ap->ap_atomic_exited);
 122
 123         wake_up(&ap->ap_waitq);
 124         thread_exit();
 125 }
 126
 127 static int
 128 splat_atomic_test1_cond(atomic_priv_t *ap, int started)
 129 {
 130         return (ap->ap_atomic_exited == started);
 131 }
 132
 133 static int
 134 splat_atomic_test1(struct file *file, void *arg)
 135 {
 136         atomic_priv_t ap;
 137         DEFINE_WAIT(wait);
 138         kthread_t *thr;
 139         int i, rc = 0;
 140
 141         ap.ap_magic = SPLAT_ATOMIC_TEST_MAGIC;
 142         ap.ap_file = file;
 143         spin_lock_init(&ap.ap_lock);
 144         init_waitqueue_head(&ap.ap_waitq);
 145         ap.ap_atomic = SPLAT_ATOMIC_INIT_VALUE;
 146         ap.ap_atomic_exited = 0;
 147
 148         for (i = 0; i < SPLAT_ATOMIC_COUNT_64; i++) {
 149                 spin_lock(&ap.ap_lock);
 150                 ap.ap_op = i;
 151
 152                 thr = (kthread_t *)thread_create(NULL, 0, splat_atomic_work,
 153                                                  &ap, 0, &p0, TS_RUN,
 154                                                  minclsyspri);
 155                 if (thr == NULL) {
 156                         rc = -ESRCH;
 157                         spin_unlock(&ap.ap_lock);
 158                         break;
 159                 }
 160
 161                 /* Prepare to wait, the new thread will wake us once it
 162                  * has made a copy of the unique private passed data */
 163                 prepare_to_wait(&ap.ap_waitq, &wait, TASK_UNINTERRUPTIBLE);
 164                 spin_unlock(&ap.ap_lock);
 165                 schedule();
 166         }
 167
 168         wait_event_interruptible(ap.ap_waitq, splat_atomic_test1_cond(&ap, i));
 169
 170         if (rc) {
 171                 splat_vprint(file, SPLAT_ATOMIC_TEST1_NAME, "Only started "
 172                              "%d/%d test threads\n", i, SPLAT_ATOMIC_COUNT_64);
 173                 return rc;
 174         }
 175
 176         if (ap.ap_atomic != SPLAT_ATOMIC_INIT_VALUE) {
 177                 splat_vprint(file, SPLAT_ATOMIC_TEST1_NAME,
 178                              "Final value %lu does not match initial value %lu\n",
 179                              (long unsigned)ap.ap_atomic, SPLAT_ATOMIC_INIT_VALUE);
 180                 return -EINVAL;
 181         }
 182
 183         splat_vprint(file, SPLAT_ATOMIC_TEST1_NAME,
 184                    "Success initial and final values match, %lu == %lu\n",
 185                    (long unsigned)ap.ap_atomic, SPLAT_ATOMIC_INIT_VALUE);
 186
 187         return 0;
 188 }
 189
 190 splat_subsystem_t *
 191 splat_atomic_init(void)
 192 {
 193         splat_subsystem_t *sub;
 194
 195         sub = kmalloc(sizeof(*sub), GFP_KERNEL);
 196         if (sub == NULL)
 197                 return NULL;
 198
 199         memset(sub, 0, sizeof(*sub));
 200         strncpy(sub->desc.name, SPLAT_ATOMIC_NAME, SPLAT_NAME_SIZE);
 201         strncpy(sub->desc.desc, SPLAT_ATOMIC_DESC, SPLAT_DESC_SIZE);
 202         INIT_LIST_HEAD(&sub->subsystem_list);
 203         INIT_LIST_HEAD(&sub->test_list);
 204         spin_lock_init(&sub->test_lock);
 205         sub->desc.id = SPLAT_SUBSYSTEM_ATOMIC;
 206
 207         SPLAT_TEST_INIT(sub, SPLAT_ATOMIC_TEST1_NAME, SPLAT_ATOMIC_TEST1_DESC,
 208                       SPLAT_ATOMIC_TEST1_ID, splat_atomic_test1);
 209
 210         return sub;
 211 }
 212
 213 void
 214 splat_atomic_fini(splat_subsystem_t *sub)
 215 {
 216         ASSERT(sub);
 217         SPLAT_TEST_FINI(sub, SPLAT_ATOMIC_TEST1_ID);
 218
 219         kfree(sub);
 220 }
 221
 222 int
 223 splat_atomic_id(void) {
 224         return SPLAT_SUBSYSTEM_ATOMIC;
 225 }