sys/dev/nvme/nvme_sysctl.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (C) 2012-2016 Intel Corporation
   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  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include "opt_nvme.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/bus.h>
  36 #include <sys/sysctl.h>
  37
  38 #include "nvme_private.h"
  39
  40 #ifndef NVME_USE_NVD
  41 #define NVME_USE_NVD 1
  42 #endif
  43
  44 int nvme_use_nvd = NVME_USE_NVD;
  45 bool nvme_verbose_cmd_dump = false;
  46
  47 SYSCTL_NODE(_hw, OID_AUTO, nvme, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
  48     "NVMe sysctl tunables");
  49 SYSCTL_INT(_hw_nvme, OID_AUTO, use_nvd, CTLFLAG_RDTUN,
  50     &nvme_use_nvd, 1, "1 = Create NVD devices, 0 = Create NDA devices");
  51 SYSCTL_BOOL(_hw_nvme, OID_AUTO, verbose_cmd_dump, CTLFLAG_RWTUN,
  52     &nvme_verbose_cmd_dump, 0,
  53     "enable verbose command printting when a command fails");
  54
  55 static void
  56 nvme_dump_queue(struct nvme_qpair *qpair)
  57 {
  58         struct nvme_completion *cpl;
  59         struct nvme_command *cmd;
  60         int i;
  61
  62         printf("id:%04Xh phase:%d\n", qpair->id, qpair->phase);
  63
  64         printf("Completion queue:\n");
  65         for (i = 0; i < qpair->num_entries; i++) {
  66                 cpl = &qpair->cpl[i];
  67                 printf("%05d: ", i);
  68                 nvme_dump_completion(cpl);
  69         }
  70
  71         printf("Submission queue:\n");
  72         for (i = 0; i < qpair->num_entries; i++) {
  73                 cmd = &qpair->cmd[i];
  74                 printf("%05d: ", i);
  75                 nvme_dump_command(cmd);
  76         }
  77 }
  78
  79 static int
  80 nvme_sysctl_dump_debug(SYSCTL_HANDLER_ARGS)
  81 {
  82         struct nvme_qpair       *qpair = arg1;
  83         uint32_t                val = 0;
  84
  85         int error = sysctl_handle_int(oidp, &val, 0, req);
  86
  87         if (error)
  88                 return (error);
  89
  90         if (val != 0)
  91                 nvme_dump_queue(qpair);
  92
  93         return (0);
  94 }
  95
  96 static int
  97 nvme_sysctl_int_coal_time(SYSCTL_HANDLER_ARGS)
  98 {
  99         struct nvme_controller *ctrlr = arg1;
 100         uint32_t oldval = ctrlr->int_coal_time;
 101         int error = sysctl_handle_int(oidp, &ctrlr->int_coal_time, 0,
 102             req);
 103
 104         if (error)
 105                 return (error);
 106
 107         if (oldval != ctrlr->int_coal_time)
 108                 nvme_ctrlr_cmd_set_interrupt_coalescing(ctrlr,
 109                     ctrlr->int_coal_time, ctrlr->int_coal_threshold, NULL,
 110                     NULL);
 111
 112         return (0);
 113 }
 114
 115 static int
 116 nvme_sysctl_int_coal_threshold(SYSCTL_HANDLER_ARGS)
 117 {
 118         struct nvme_controller *ctrlr = arg1;
 119         uint32_t oldval = ctrlr->int_coal_threshold;
 120         int error = sysctl_handle_int(oidp, &ctrlr->int_coal_threshold, 0,
 121             req);
 122
 123         if (error)
 124                 return (error);
 125
 126         if (oldval != ctrlr->int_coal_threshold)
 127                 nvme_ctrlr_cmd_set_interrupt_coalescing(ctrlr,
 128                     ctrlr->int_coal_time, ctrlr->int_coal_threshold, NULL,
 129                     NULL);
 130
 131         return (0);
 132 }
 133
 134 static int
 135 nvme_sysctl_timeout_period(SYSCTL_HANDLER_ARGS)
 136 {
 137         struct nvme_controller *ctrlr = arg1;
 138         uint32_t newval = ctrlr->timeout_period;
 139         int error = sysctl_handle_int(oidp, &newval, 0, req);
 140
 141         if (error || (req->newptr == NULL))
 142                 return (error);
 143
 144         if (newval > NVME_MAX_TIMEOUT_PERIOD ||
 145             newval < NVME_MIN_TIMEOUT_PERIOD) {
 146                 return (EINVAL);
 147         } else {
 148                 ctrlr->timeout_period = newval;
 149         }
 150
 151         return (0);
 152 }
 153
 154 static void
 155 nvme_qpair_reset_stats(struct nvme_qpair *qpair)
 156 {
 157
 158         qpair->num_cmds = 0;
 159         qpair->num_intr_handler_calls = 0;
 160         qpair->num_retries = 0;
 161         qpair->num_failures = 0;
 162 }
 163
 164 static int
 165 nvme_sysctl_num_cmds(SYSCTL_HANDLER_ARGS)
 166 {
 167         struct nvme_controller  *ctrlr = arg1;
 168         int64_t                 num_cmds = 0;
 169         int                     i;
 170
 171         num_cmds = ctrlr->adminq.num_cmds;
 172
 173         for (i = 0; i < ctrlr->num_io_queues; i++)
 174                 num_cmds += ctrlr->ioq[i].num_cmds;
 175
 176         return (sysctl_handle_64(oidp, &num_cmds, 0, req));
 177 }
 178
 179 static int
 180 nvme_sysctl_num_intr_handler_calls(SYSCTL_HANDLER_ARGS)
 181 {
 182         struct nvme_controller  *ctrlr = arg1;
 183         int64_t                 num_intr_handler_calls = 0;
 184         int                     i;
 185
 186         num_intr_handler_calls = ctrlr->adminq.num_intr_handler_calls;
 187
 188         for (i = 0; i < ctrlr->num_io_queues; i++)
 189                 num_intr_handler_calls += ctrlr->ioq[i].num_intr_handler_calls;
 190
 191         return (sysctl_handle_64(oidp, &num_intr_handler_calls, 0, req));
 192 }
 193
 194 static int
 195 nvme_sysctl_num_retries(SYSCTL_HANDLER_ARGS)
 196 {
 197         struct nvme_controller  *ctrlr = arg1;
 198         int64_t                 num_retries = 0;
 199         int                     i;
 200
 201         num_retries = ctrlr->adminq.num_retries;
 202
 203         for (i = 0; i < ctrlr->num_io_queues; i++)
 204                 num_retries += ctrlr->ioq[i].num_retries;
 205
 206         return (sysctl_handle_64(oidp, &num_retries, 0, req));
 207 }
 208
 209 static int
 210 nvme_sysctl_num_failures(SYSCTL_HANDLER_ARGS)
 211 {
 212         struct nvme_controller  *ctrlr = arg1;
 213         int64_t                 num_failures = 0;
 214         int                     i;
 215
 216         num_failures = ctrlr->adminq.num_failures;
 217
 218         for (i = 0; i < ctrlr->num_io_queues; i++)
 219                 num_failures += ctrlr->ioq[i].num_failures;
 220
 221         return (sysctl_handle_64(oidp, &num_failures, 0, req));
 222 }
 223
 224 static int
 225 nvme_sysctl_reset_stats(SYSCTL_HANDLER_ARGS)
 226 {
 227         struct nvme_controller  *ctrlr = arg1;
 228         uint32_t                i, val = 0;
 229
 230         int error = sysctl_handle_int(oidp, &val, 0, req);
 231
 232         if (error)
 233                 return (error);
 234
 235         if (val != 0) {
 236                 nvme_qpair_reset_stats(&ctrlr->adminq);
 237
 238                 for (i = 0; i < ctrlr->num_io_queues; i++)
 239                         nvme_qpair_reset_stats(&ctrlr->ioq[i]);
 240         }
 241
 242         return (0);
 243 }
 244
 245 static void
 246 nvme_sysctl_initialize_queue(struct nvme_qpair *qpair,
 247     struct sysctl_ctx_list *ctrlr_ctx, struct sysctl_oid *que_tree)
 248 {
 249         struct sysctl_oid_list  *que_list = SYSCTL_CHILDREN(que_tree);
 250
 251         SYSCTL_ADD_UINT(ctrlr_ctx, que_list, OID_AUTO, "num_entries",
 252             CTLFLAG_RD, &qpair->num_entries, 0,
 253             "Number of entries in hardware queue");
 254         SYSCTL_ADD_UINT(ctrlr_ctx, que_list, OID_AUTO, "num_trackers",
 255             CTLFLAG_RD, &qpair->num_trackers, 0,
 256             "Number of trackers pre-allocated for this queue pair");
 257         SYSCTL_ADD_UINT(ctrlr_ctx, que_list, OID_AUTO, "sq_head",
 258             CTLFLAG_RD, &qpair->sq_head, 0,
 259             "Current head of submission queue (as observed by driver)");
 260         SYSCTL_ADD_UINT(ctrlr_ctx, que_list, OID_AUTO, "sq_tail",
 261             CTLFLAG_RD, &qpair->sq_tail, 0,
 262             "Current tail of submission queue (as observed by driver)");
 263         SYSCTL_ADD_UINT(ctrlr_ctx, que_list, OID_AUTO, "cq_head",
 264             CTLFLAG_RD, &qpair->cq_head, 0,
 265             "Current head of completion queue (as observed by driver)");
 266
 267         SYSCTL_ADD_QUAD(ctrlr_ctx, que_list, OID_AUTO, "num_cmds",
 268             CTLFLAG_RD, &qpair->num_cmds, "Number of commands submitted");
 269         SYSCTL_ADD_QUAD(ctrlr_ctx, que_list, OID_AUTO, "num_intr_handler_calls",
 270             CTLFLAG_RD, &qpair->num_intr_handler_calls,
 271             "Number of times interrupt handler was invoked (will typically be "
 272             "less than number of actual interrupts generated due to "
 273             "coalescing)");
 274         SYSCTL_ADD_QUAD(ctrlr_ctx, que_list, OID_AUTO, "num_retries",
 275             CTLFLAG_RD, &qpair->num_retries, "Number of commands retried");
 276         SYSCTL_ADD_QUAD(ctrlr_ctx, que_list, OID_AUTO, "num_failures",
 277             CTLFLAG_RD, &qpair->num_failures,
 278             "Number of commands ending in failure after all retries");
 279
 280         SYSCTL_ADD_PROC(ctrlr_ctx, que_list, OID_AUTO,
 281             "dump_debug", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
 282             qpair, 0, nvme_sysctl_dump_debug, "IU", "Dump debug data");
 283 }
 284
 285 void
 286 nvme_sysctl_initialize_ctrlr(struct nvme_controller *ctrlr)
 287 {
 288         struct sysctl_ctx_list  *ctrlr_ctx;
 289         struct sysctl_oid       *ctrlr_tree, *que_tree;
 290         struct sysctl_oid_list  *ctrlr_list;
 291 #define QUEUE_NAME_LENGTH       16
 292         char                    queue_name[QUEUE_NAME_LENGTH];
 293         int                     i;
 294
 295         ctrlr_ctx = device_get_sysctl_ctx(ctrlr->dev);
 296         ctrlr_tree = device_get_sysctl_tree(ctrlr->dev);
 297         ctrlr_list = SYSCTL_CHILDREN(ctrlr_tree);
 298
 299         SYSCTL_ADD_UINT(ctrlr_ctx, ctrlr_list, OID_AUTO, "num_io_queues",
 300             CTLFLAG_RD, &ctrlr->num_io_queues, 0,
 301             "Number of I/O queue pairs");
 302
 303         SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
 304             "int_coal_time", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
 305             ctrlr, 0, nvme_sysctl_int_coal_time, "IU",
 306             "Interrupt coalescing timeout (in microseconds)");
 307
 308         SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
 309             "int_coal_threshold",
 310             CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, ctrlr, 0,
 311             nvme_sysctl_int_coal_threshold, "IU",
 312             "Interrupt coalescing threshold");
 313
 314         SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
 315             "timeout_period", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
 316             ctrlr, 0, nvme_sysctl_timeout_period, "IU",
 317             "Timeout period (in seconds)");
 318
 319         SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
 320             "num_cmds", CTLTYPE_S64 | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
 321             ctrlr, 0, nvme_sysctl_num_cmds, "IU",
 322             "Number of commands submitted");
 323
 324         SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
 325             "num_intr_handler_calls",
 326             CTLTYPE_S64 | CTLFLAG_RD | CTLFLAG_NEEDGIANT, ctrlr, 0,
 327             nvme_sysctl_num_intr_handler_calls, "IU",
 328             "Number of times interrupt handler was invoked (will "
 329             "typically be less than number of actual interrupts "
 330             "generated due to coalescing)");
 331
 332         SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
 333             "num_retries", CTLTYPE_S64 | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
 334             ctrlr, 0, nvme_sysctl_num_retries, "IU",
 335             "Number of commands retried");
 336
 337         SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
 338             "num_failures", CTLTYPE_S64 | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
 339             ctrlr, 0, nvme_sysctl_num_failures, "IU",
 340             "Number of commands ending in failure after all retries");
 341
 342         SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
 343             "reset_stats", CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, ctrlr,
 344             0, nvme_sysctl_reset_stats, "IU", "Reset statistics to zero");
 345
 346         que_tree = SYSCTL_ADD_NODE(ctrlr_ctx, ctrlr_list, OID_AUTO, "adminq",
 347             CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "Admin Queue");
 348
 349         nvme_sysctl_initialize_queue(&ctrlr->adminq, ctrlr_ctx, que_tree);
 350
 351         for (i = 0; i < ctrlr->num_io_queues; i++) {
 352                 snprintf(queue_name, QUEUE_NAME_LENGTH, "ioq%d", i);
 353                 que_tree = SYSCTL_ADD_NODE(ctrlr_ctx, ctrlr_list, OID_AUTO,
 354                     queue_name, CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, "IO Queue");
 355                 nvme_sysctl_initialize_queue(&ctrlr->ioq[i], ctrlr_ctx,
 356                     que_tree);
 357         }
 358 }