FreeBSD/Linux Kernel Cross Reference
sys/dev/nvme/nvme_sysctl.c

     /*-
      * Copyright (C) 2012-2016 Intel Corporation
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include "opt_nvme.h"
    
    #include <sys/param.h>
    #include <sys/bus.h>
    #include <sys/sysctl.h>
    
    #include "nvme_private.h"
    
    #ifndef NVME_USE_NVD
    #define NVME_USE_NVD 1
    #endif
    
    int nvme_use_nvd = NVME_USE_NVD;
    
    SYSCTL_NODE(_hw, OID_AUTO, nvme, CTLFLAG_RD, 0, "NVMe sysctl tunables");
    SYSCTL_INT(_hw_nvme, OID_AUTO, use_nvd, CTLFLAG_RDTUN,
        &nvme_use_nvd, 1, "1 = Create NVD devices, 0 = Create NDA devices");
    
    /*
     * CTLTYPE_S64 and sysctl_handle_64 were added in r217616.  Define these
     *  explicitly here for older kernels that don't include the r217616
     *  changeset.
     */
    #ifndef CTLTYPE_S64
    #define CTLTYPE_S64             CTLTYPE_QUAD
    #define sysctl_handle_64        sysctl_handle_quad
    #endif
    
    static void
    nvme_dump_queue(struct nvme_qpair *qpair)
    {
            struct nvme_completion *cpl;
            struct nvme_command *cmd;
            int i;
    
            printf("id:%04Xh phase:%d\n", qpair->id, qpair->phase);
    
            printf("Completion queue:\n");
            for (i = 0; i < qpair->num_entries; i++) {
                    cpl = &qpair->cpl[i];
                    printf("%05d: ", i);
                    nvme_dump_completion(cpl);
            }
    
            printf("Submission queue:\n");
            for (i = 0; i < qpair->num_entries; i++) {
                    cmd = &qpair->cmd[i];
                    printf("%05d: ", i);
                    nvme_dump_command(cmd);
            }
    }
    
    
    static int
    nvme_sysctl_dump_debug(SYSCTL_HANDLER_ARGS)
    {
            struct nvme_qpair       *qpair = arg1;
            uint32_t                val = 0;
    
            int error = sysctl_handle_int(oidp, &val, 0, req);
    
            if (error)
                    return (error);
    
            if (val != 0)
                    nvme_dump_queue(qpair);
    
            return (0);
    }
    
   static int
   nvme_sysctl_int_coal_time(SYSCTL_HANDLER_ARGS)
   {
           struct nvme_controller *ctrlr = arg1;
           uint32_t oldval = ctrlr->int_coal_time;
           int error = sysctl_handle_int(oidp, &ctrlr->int_coal_time, 0,
               req);
   
           if (error)
                   return (error);
   
           if (oldval != ctrlr->int_coal_time)
                   nvme_ctrlr_cmd_set_interrupt_coalescing(ctrlr,
                       ctrlr->int_coal_time, ctrlr->int_coal_threshold, NULL,
                       NULL);
   
           return (0);
   }
   
   static int
   nvme_sysctl_int_coal_threshold(SYSCTL_HANDLER_ARGS)
   {
           struct nvme_controller *ctrlr = arg1;
           uint32_t oldval = ctrlr->int_coal_threshold;
           int error = sysctl_handle_int(oidp, &ctrlr->int_coal_threshold, 0,
               req);
   
           if (error)
                   return (error);
   
           if (oldval != ctrlr->int_coal_threshold)
                   nvme_ctrlr_cmd_set_interrupt_coalescing(ctrlr,
                       ctrlr->int_coal_time, ctrlr->int_coal_threshold, NULL,
                       NULL);
   
           return (0);
   }
   
   static int
   nvme_sysctl_timeout_period(SYSCTL_HANDLER_ARGS)
   {
           struct nvme_controller *ctrlr = arg1;
           uint32_t oldval = ctrlr->timeout_period;
           int error = sysctl_handle_int(oidp, &ctrlr->timeout_period, 0, req);
   
           if (error)
                   return (error);
   
           if (ctrlr->timeout_period > NVME_MAX_TIMEOUT_PERIOD ||
               ctrlr->timeout_period < NVME_MIN_TIMEOUT_PERIOD) {
                   ctrlr->timeout_period = oldval;
                   return (EINVAL);
           }
   
           return (0);
   }
   
   static void
   nvme_qpair_reset_stats(struct nvme_qpair *qpair)
   {
   
           qpair->num_cmds = 0;
           qpair->num_intr_handler_calls = 0;
   }
   
   static int
   nvme_sysctl_num_cmds(SYSCTL_HANDLER_ARGS)
   {
           struct nvme_controller  *ctrlr = arg1;
           int64_t                 num_cmds = 0;
           int                     i;
   
           num_cmds = ctrlr->adminq.num_cmds;
   
           for (i = 0; i < ctrlr->num_io_queues; i++)
                   num_cmds += ctrlr->ioq[i].num_cmds;
   
           return (sysctl_handle_64(oidp, &num_cmds, 0, req));
   }
   
   static int
   nvme_sysctl_num_intr_handler_calls(SYSCTL_HANDLER_ARGS)
   {
           struct nvme_controller  *ctrlr = arg1;
           int64_t                 num_intr_handler_calls = 0;
           int                     i;
   
           num_intr_handler_calls = ctrlr->adminq.num_intr_handler_calls;
   
           for (i = 0; i < ctrlr->num_io_queues; i++)
                   num_intr_handler_calls += ctrlr->ioq[i].num_intr_handler_calls;
   
           return (sysctl_handle_64(oidp, &num_intr_handler_calls, 0, req));
   }
   
   static int
   nvme_sysctl_reset_stats(SYSCTL_HANDLER_ARGS)
   {
           struct nvme_controller  *ctrlr = arg1;
           uint32_t                i, val = 0;
   
           int error = sysctl_handle_int(oidp, &val, 0, req);
   
           if (error)
                   return (error);
   
           if (val != 0) {
                   nvme_qpair_reset_stats(&ctrlr->adminq);
   
                   for (i = 0; i < ctrlr->num_io_queues; i++)
                           nvme_qpair_reset_stats(&ctrlr->ioq[i]);
           }
   
           return (0);
   }
   
   
   static void
   nvme_sysctl_initialize_queue(struct nvme_qpair *qpair,
       struct sysctl_ctx_list *ctrlr_ctx, struct sysctl_oid *que_tree)
   {
           struct sysctl_oid_list  *que_list = SYSCTL_CHILDREN(que_tree);
   
           SYSCTL_ADD_UINT(ctrlr_ctx, que_list, OID_AUTO, "num_entries",
               CTLFLAG_RD, &qpair->num_entries, 0,
               "Number of entries in hardware queue");
           SYSCTL_ADD_UINT(ctrlr_ctx, que_list, OID_AUTO, "num_trackers",
               CTLFLAG_RD, &qpair->num_trackers, 0,
               "Number of trackers pre-allocated for this queue pair");
           SYSCTL_ADD_UINT(ctrlr_ctx, que_list, OID_AUTO, "sq_head",
               CTLFLAG_RD, &qpair->sq_head, 0,
               "Current head of submission queue (as observed by driver)");
           SYSCTL_ADD_UINT(ctrlr_ctx, que_list, OID_AUTO, "sq_tail",
               CTLFLAG_RD, &qpair->sq_tail, 0,
               "Current tail of submission queue (as observed by driver)");
           SYSCTL_ADD_UINT(ctrlr_ctx, que_list, OID_AUTO, "cq_head",
               CTLFLAG_RD, &qpair->cq_head, 0,
               "Current head of completion queue (as observed by driver)");
   
           SYSCTL_ADD_QUAD(ctrlr_ctx, que_list, OID_AUTO, "num_cmds",
               CTLFLAG_RD, &qpair->num_cmds, "Number of commands submitted");
           SYSCTL_ADD_QUAD(ctrlr_ctx, que_list, OID_AUTO, "num_intr_handler_calls",
               CTLFLAG_RD, &qpair->num_intr_handler_calls,
               "Number of times interrupt handler was invoked (will typically be "
               "less than number of actual interrupts generated due to "
               "coalescing)");
   
           SYSCTL_ADD_PROC(ctrlr_ctx, que_list, OID_AUTO,
               "dump_debug", CTLTYPE_UINT | CTLFLAG_RW, qpair, 0,
               nvme_sysctl_dump_debug, "IU", "Dump debug data");
   }
   
   void
   nvme_sysctl_initialize_ctrlr(struct nvme_controller *ctrlr)
   {
           struct sysctl_ctx_list  *ctrlr_ctx;
           struct sysctl_oid       *ctrlr_tree, *que_tree;
           struct sysctl_oid_list  *ctrlr_list;
   #define QUEUE_NAME_LENGTH       16
           char                    queue_name[QUEUE_NAME_LENGTH];
           int                     i;
   
           ctrlr_ctx = device_get_sysctl_ctx(ctrlr->dev);
           ctrlr_tree = device_get_sysctl_tree(ctrlr->dev);
           ctrlr_list = SYSCTL_CHILDREN(ctrlr_tree);
   
           SYSCTL_ADD_UINT(ctrlr_ctx, ctrlr_list, OID_AUTO, "num_cpus_per_ioq",
               CTLFLAG_RD, &ctrlr->num_cpus_per_ioq, 0,
               "Number of CPUs assigned per I/O queue pair");
   
           SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
               "int_coal_time", CTLTYPE_UINT | CTLFLAG_RW, ctrlr, 0,
               nvme_sysctl_int_coal_time, "IU",
               "Interrupt coalescing timeout (in microseconds)");
   
           SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
               "int_coal_threshold", CTLTYPE_UINT | CTLFLAG_RW, ctrlr, 0,
               nvme_sysctl_int_coal_threshold, "IU",
               "Interrupt coalescing threshold");
   
           SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
               "timeout_period", CTLTYPE_UINT | CTLFLAG_RW, ctrlr, 0,
               nvme_sysctl_timeout_period, "IU",
               "Timeout period (in seconds)");
   
           SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
               "num_cmds", CTLTYPE_S64 | CTLFLAG_RD,
               ctrlr, 0, nvme_sysctl_num_cmds, "IU",
               "Number of commands submitted");
   
           SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
               "num_intr_handler_calls", CTLTYPE_S64 | CTLFLAG_RD,
               ctrlr, 0, nvme_sysctl_num_intr_handler_calls, "IU",
               "Number of times interrupt handler was invoked (will "
               "typically be less than number of actual interrupts "
               "generated due to coalescing)");
   
           SYSCTL_ADD_PROC(ctrlr_ctx, ctrlr_list, OID_AUTO,
               "reset_stats", CTLTYPE_UINT | CTLFLAG_RW, ctrlr, 0,
               nvme_sysctl_reset_stats, "IU", "Reset statistics to zero");
   
           que_tree = SYSCTL_ADD_NODE(ctrlr_ctx, ctrlr_list, OID_AUTO, "adminq",
               CTLFLAG_RD, NULL, "Admin Queue");
   
           nvme_sysctl_initialize_queue(&ctrlr->adminq, ctrlr_ctx, que_tree);
   
           for (i = 0; i < ctrlr->num_io_queues; i++) {
                   snprintf(queue_name, QUEUE_NAME_LENGTH, "ioq%d", i);
                   que_tree = SYSCTL_ADD_NODE(ctrlr_ctx, ctrlr_list, OID_AUTO,
                       queue_name, CTLFLAG_RD, NULL, "IO Queue");
                   nvme_sysctl_initialize_queue(&ctrlr->ioq[i], ctrlr_ctx,
                       que_tree);
           }
   }

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