Spdk/module/event/subsystems/vmd/vmd.c

/*-
 *   BSD LICENSE
 *
 *   Copyright (c) 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:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Intel Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
 *   OWNER 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 "spdk/stdinc.h"
#include "spdk/conf.h"
#include "spdk/thread.h"
#include "spdk/likely.h"

#include "spdk/vmd.h"

#include "spdk_internal/event.h"
#include "event_vmd.h"

static struct spdk_poller *g_hotplug_poller;
static bool g_enabled;

static int
vmd_hotplug_monitor(void *ctx)
{
	return spdk_vmd_hotplug_monitor();
}

int
vmd_subsystem_init(void)
{
	int rc;

	if (g_enabled) {
		SPDK_ERRLOG("The initialization has already been performed\n");
		return -EBUSY;
	}

	rc = spdk_vmd_init();
	if (spdk_likely(rc != 0)) {
		SPDK_ERRLOG("Failed to initialize the VMD library\n");
		return rc;
	}

	assert(g_hotplug_poller == NULL);

	g_hotplug_poller = spdk_poller_register(vmd_hotplug_monitor, NULL, 1000000ULL);
	if (g_hotplug_poller == NULL) {
		SPDK_ERRLOG("Failed to register hotplug monitor poller\n");
		return -ENOMEM;
	}

	g_enabled = true;

	return 0;
}

static void
spdk_vmd_subsystem_init(void)
{
	struct spdk_conf_section *sp;
	int rc = 0;

	sp = spdk_conf_find_section(NULL, "Vmd");
	if (sp != NULL) {
		if (spdk_conf_section_get_boolval(sp, "Enable", false)) {
			rc = vmd_subsystem_init();
		}
	}

	spdk_subsystem_init_next(rc);
}

static void
spdk_vmd_subsystem_fini(void)
{
	spdk_poller_unregister(&g_hotplug_poller);

	spdk_vmd_fini();

	spdk_subsystem_fini_next();
}

static void
spdk_vmd_write_config_json(struct spdk_json_write_ctx *w)
{
	spdk_json_write_array_begin(w);

	if (g_enabled) {
		spdk_json_write_object_begin(w);
		spdk_json_write_named_string(w, "method", "enable_vmd");
		spdk_json_write_named_object_begin(w, "params");
		spdk_json_write_object_end(w);
		spdk_json_write_object_end(w);
	}

	spdk_json_write_array_end(w);
}

static struct spdk_subsystem g_spdk_subsystem_vmd = {
	.name = "vmd",
	.init = spdk_vmd_subsystem_init,
	.fini = spdk_vmd_subsystem_fini,
	.config = NULL,
	.write_config_json = spdk_vmd_write_config_json,
};

SPDK_SUBSYSTEM_REGISTER(g_spdk_subsystem_vmd);