static void nvme_reset_work()

in host/pci.c [2790:2931]

• 95 lines of code
• 21 McCabe index (conditional complexity)

static void nvme_reset_work(struct work_struct *work)
{
	struct nvme_dev *dev =
		container_of(work, struct nvme_dev, ctrl.reset_work);
	bool was_suspend = !!(dev->ctrl.ctrl_config & NVME_CC_SHN_NORMAL);
	int result;

	if (dev->ctrl.state != NVME_CTRL_RESETTING) {
		dev_warn(dev->ctrl.device, "ctrl state %d is not RESETTING\n",
			 dev->ctrl.state);
		result = -ENODEV;
		goto out;
	}

	/*
	 * If we're called to reset a live controller first shut it down before
	 * moving on.
	 */
	if (dev->ctrl.ctrl_config & NVME_CC_ENABLE)
		nvme_dev_disable(dev, false);
	nvme_sync_queues(&dev->ctrl);

	mutex_lock(&dev->shutdown_lock);
	result = nvme_pci_enable(dev);
	if (result)
		goto out_unlock;

	result = nvme_pci_configure_admin_queue(dev);
	if (result)
		goto out_unlock;

	result = nvme_alloc_admin_tags(dev);
	if (result)
		goto out_unlock;

	/*
	 * Limit the max command size to prevent iod->sg allocations going
	 * over a single page.
	 */
	dev->ctrl.max_hw_sectors = min_t(u32,
		NVME_MAX_KB_SZ << 1, dma_max_mapping_size(dev->dev) >> 9);
	dev->ctrl.max_segments = NVME_MAX_SEGS;

	/*
	 * Don't limit the IOMMU merged segment size.
	 */
	dma_set_max_seg_size(dev->dev, 0xffffffff);
	dma_set_min_align_mask(dev->dev, NVME_CTRL_PAGE_SIZE - 1);

	mutex_unlock(&dev->shutdown_lock);

	/*
	 * Introduce CONNECTING state from nvme-fc/rdma transports to mark the
	 * initializing procedure here.
	 */
	if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_CONNECTING)) {
		dev_warn(dev->ctrl.device,
			"failed to mark controller CONNECTING\n");
		result = -EBUSY;
		goto out;
	}

	/*
	 * We do not support an SGL for metadata (yet), so we are limited to a
	 * single integrity segment for the separate metadata pointer.
	 */
	dev->ctrl.max_integrity_segments = 1;

	result = nvme_init_ctrl_finish(&dev->ctrl);
	if (result)
		goto out;

	if (dev->ctrl.oacs & NVME_CTRL_OACS_SEC_SUPP) {
		if (!dev->ctrl.opal_dev)
			dev->ctrl.opal_dev =
				init_opal_dev(&dev->ctrl, &nvme_sec_submit);
		else if (was_suspend)
			opal_unlock_from_suspend(dev->ctrl.opal_dev);
	} else {
		free_opal_dev(dev->ctrl.opal_dev);
		dev->ctrl.opal_dev = NULL;
	}

	if (dev->ctrl.oacs & NVME_CTRL_OACS_DBBUF_SUPP) {
		result = nvme_dbbuf_dma_alloc(dev);
		if (result)
			dev_warn(dev->dev,
				 "unable to allocate dma for dbbuf\n");
	}

	if (dev->ctrl.hmpre) {
		result = nvme_setup_host_mem(dev);
		if (result < 0)
			goto out;
	}

	result = nvme_setup_io_queues(dev);
	if (result)
		goto out;

	/*
	 * Keep the controller around but remove all namespaces if we don't have
	 * any working I/O queue.
	 */
	if (dev->online_queues < 2) {
		dev_warn(dev->ctrl.device, "IO queues not created\n");
		nvme_kill_queues(&dev->ctrl);
		nvme_remove_namespaces(&dev->ctrl);
		nvme_free_tagset(dev);
	} else {
		nvme_start_queues(&dev->ctrl);
		nvme_wait_freeze(&dev->ctrl);
		nvme_dev_add(dev);
		nvme_unfreeze(&dev->ctrl);
	}

	/*
	 * If only admin queue live, keep it to do further investigation or
	 * recovery.
	 */
	if (!nvme_change_ctrl_state(&dev->ctrl, NVME_CTRL_LIVE)) {
		dev_warn(dev->ctrl.device,
			"failed to mark controller live state\n");
		result = -ENODEV;
		goto out;
	}

	if (!dev->attrs_added && !sysfs_create_group(&dev->ctrl.device->kobj,
			&nvme_pci_attr_group))
		dev->attrs_added = true;

	nvme_start_ctrl(&dev->ctrl);
	return;

 out_unlock:
	mutex_unlock(&dev->shutdown_lock);
 out:
	if (result)
		dev_warn(dev->ctrl.device,
			 "Removing after probe failure status: %d\n", result);
	nvme_remove_dead_ctrl(dev);
}