nvme/host/core.c

123 static void nvme_put_subsystem(struct nvme_subsystem *subsys);
607 	ida_free(&head->subsys->ns_ida, head->instance);
609 	nvme_put_subsystem(head->subsys);
1097 		mutex_lock(&ctrl->subsys->lock);
1098 		nvme_mpath_start_freeze(ctrl->subsys);
1099 		nvme_mpath_wait_freeze(ctrl->subsys);
1112 		nvme_mpath_unfreeze(ctrl->subsys);
1113 		mutex_unlock(&ctrl->subsys->lock);
1899 			atomic_bs = (1 + ns->ctrl->subsys->awupf) * bs;
2626 static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl,
2635 			strscpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE);
2648 	off = snprintf(subsys->subnqn, NVMF_NQN_SIZE,
2651 	memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn));
2653 	memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn));
2655 	memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off);
2660 	struct nvme_subsystem *subsys =
2663 	if (subsys->instance >= 0)
2664 		ida_free(&nvme_instance_ida, subsys->instance);
2665 	kfree(subsys);
2670 	struct nvme_subsystem *subsys =
2674 	list_del(&subsys->entry);
2677 	ida_destroy(&subsys->ns_ida);
2678 	device_del(&subsys->dev);
2679 	put_device(&subsys->dev);
2682 static void nvme_put_subsystem(struct nvme_subsystem *subsys)
2684 	kref_put(&subsys->ref, nvme_destroy_subsystem);
2689 	struct nvme_subsystem *subsys;
2704 	list_for_each_entry(subsys, &nvme_subsystems, entry) {
2705 		if (strcmp(subsys->subnqn, subsysnqn))
2707 		if (!kref_get_unless_zero(&subsys->ref))
2709 		return subsys;
2720 static bool nvme_validate_cntlid(struct nvme_subsystem *subsys,
2727 	list_for_each_entry(tmp, &subsys->ctrls, subsys_entry) {
2733 				"Duplicate cntlid %u with %s, subsys %s, rejecting\n",
2735 				subsys->subnqn);
2753 	struct nvme_subsystem *subsys, *found;
2756 	subsys = kzalloc(sizeof(*subsys), GFP_KERNEL);
2757 	if (!subsys)
2760 	subsys->instance = -1;
2761 	mutex_init(&subsys->lock);
2762 	kref_init(&subsys->ref);
2763 	INIT_LIST_HEAD(&subsys->ctrls);
2764 	INIT_LIST_HEAD(&subsys->nsheads);
2765 	nvme_init_subnqn(subsys, ctrl, id);
2766 	memcpy(subsys->serial, id->sn, sizeof(subsys->serial));
2767 	memcpy(subsys->model, id->mn, sizeof(subsys->model));
2768 	subsys->vendor_id = le16_to_cpu(id->vid);
2769 	subsys->cmic = id->cmic;
2773 	    !strcmp(subsys->subnqn, NVME_DISC_SUBSYS_NAME))
2774 		subsys->subtype = NVME_NQN_DISC;
2776 		subsys->subtype = NVME_NQN_NVME;
2778 	if (nvme_discovery_ctrl(ctrl) && subsys->subtype != NVME_NQN_DISC) {
2781 			subsys->subnqn);
2782 		kfree(subsys);
2785 	subsys->awupf = le16_to_cpu(id->awupf);
2786 	nvme_mpath_default_iopolicy(subsys);
2788 	subsys->dev.class = nvme_subsys_class;
2789 	subsys->dev.release = nvme_release_subsystem;
2790 	subsys->dev.groups = nvme_subsys_attrs_groups;
2791 	dev_set_name(&subsys->dev, "nvme-subsys%d", ctrl->instance);
2792 	device_initialize(&subsys->dev);
2795 	found = __nvme_find_get_subsystem(subsys->subnqn);
2797 		put_device(&subsys->dev);
2798 		subsys = found;
2800 		if (!nvme_validate_cntlid(subsys, ctrl, id)) {
2805 		ret = device_add(&subsys->dev);
2809 			put_device(&subsys->dev);
2812 		ida_init(&subsys->ns_ida);
2813 		list_add_tail(&subsys->entry, &nvme_subsystems);
2816 	ret = sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj,
2825 		subsys->instance = ctrl->instance;
2826 	ctrl->subsys = subsys;
2827 	list_add_tail(&ctrl->subsys_entry, &subsys->ctrls);
2832 	nvme_put_subsystem(subsys);
2922 	if (ctrl->subsys->subtype != NVME_NQN_NVME ||
3066 	memcpy(ctrl->subsys->firmware_rev, id->fr,
3067 	       sizeof(ctrl->subsys->firmware_rev));
3279 	lockdep_assert_held(&ctrl->subsys->lock);
3281 	list_for_each_entry(h, &ctrl->subsys->nsheads, entry) {
3296 static int nvme_subsys_check_duplicate_ids(struct nvme_subsystem *subsys,
3304 	lockdep_assert_held(&subsys->lock);
3306 	list_for_each_entry(h, &subsys->nsheads, entry) {
3401 	ret = ida_alloc_min(&ctrl->subsys->ns_ida, 1, GFP_KERNEL);
3409 	head->subsys = ctrl->subsys;
3426 	list_add_tail(&head->entry, &ctrl->subsys->nsheads);
3428 	kref_get(&ctrl->subsys->ref);
3434 	ida_free(&ctrl->subsys->ns_ida, head->instance);
3475 	ret = nvme_global_check_duplicate_ids(ctrl->subsys, &info->ids);
3495 		    ((ns->ctrl->subsys->cmic & NVME_CTRL_CMIC_MULTI_CTRL) &&
3513 	mutex_lock(&ctrl->subsys->lock);
3516 		ret = nvme_subsys_check_duplicate_ids(ctrl->subsys, &info->ids);
3554 	mutex_unlock(&ctrl->subsys->lock);
3560 	mutex_unlock(&ctrl->subsys->lock);
3647 		sprintf(disk->disk_name, "nvme%dc%dn%d", ctrl->subsys->instance,
3651 		sprintf(disk->disk_name, "nvme%dn%d", ctrl->subsys->instance,
3693 	mutex_lock(&ctrl->subsys->lock);
3697 	mutex_unlock(&ctrl->subsys->lock);
3726 	mutex_lock(&ns->ctrl->subsys->lock);
3732 	mutex_unlock(&ns->ctrl->subsys->lock);
4444 	struct nvme_subsystem *subsys = ctrl->subsys;
4446 	if (!subsys || ctrl->instance != subsys->instance)
4457 	if (subsys) {
4460 		sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device));
4466 	if (subsys)
4467 		nvme_put_subsystem(subsys);