Contributors: 14
Author Tokens Token Proportion Commits Commit Proportion
John Garry 6291 50.62% 79 35.11%
Xiang Chen 3400 27.36% 74 32.89%
Xiaofei Tan 1944 15.64% 32 14.22%
Luo Jiaxing 563 4.53% 24 10.67%
Qi Liu 89 0.72% 3 1.33%
Jianqin Xie 80 0.64% 1 0.44%
Ahmed S. Darwish 28 0.23% 3 1.33%
Hannes Reinecke 10 0.08% 1 0.44%
Gustavo A. R. Silva 6 0.05% 2 0.89%
Kees Cook 5 0.04% 1 0.44%
Christophe Jaillet 5 0.04% 2 0.89%
Yue haibing 3 0.02% 1 0.44%
Bart Van Assche 3 0.02% 1 0.44%
Thomas Gleixner 2 0.02% 1 0.44%
Total 12429 225 


// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2015 Linaro Ltd.
 * Copyright (c) 2015 Hisilicon Limited.
 */

#include "hisi_sas.h"
#define DRV_NAME "hisi_sas"

#define DEV_IS_GONE(dev) \
	((!dev) || (dev->dev_type == SAS_PHY_UNUSED))

static int hisi_sas_softreset_ata_disk(struct domain_device *device);
static int hisi_sas_control_phy(struct asd_sas_phy *sas_phy, enum phy_func func,
				void *funcdata);
static void hisi_sas_release_task(struct hisi_hba *hisi_hba,
				  struct domain_device *device);
static void hisi_sas_dev_gone(struct domain_device *device);

struct hisi_sas_internal_abort_data {
	bool rst_ha_timeout; /* reset the HA for timeout */
};

u8 hisi_sas_get_ata_protocol(struct host_to_dev_fis *fis, int direction)
{
	switch (fis->command) {
	case ATA_CMD_FPDMA_WRITE:
	case ATA_CMD_FPDMA_READ:
	case ATA_CMD_FPDMA_RECV:
	case ATA_CMD_FPDMA_SEND:
	case ATA_CMD_NCQ_NON_DATA:
		return HISI_SAS_SATA_PROTOCOL_FPDMA;

	case ATA_CMD_DOWNLOAD_MICRO:
	case ATA_CMD_ID_ATA:
	case ATA_CMD_PMP_READ:
	case ATA_CMD_READ_LOG_EXT:
	case ATA_CMD_PIO_READ:
	case ATA_CMD_PIO_READ_EXT:
	case ATA_CMD_PMP_WRITE:
	case ATA_CMD_WRITE_LOG_EXT:
	case ATA_CMD_PIO_WRITE:
	case ATA_CMD_PIO_WRITE_EXT:
		return HISI_SAS_SATA_PROTOCOL_PIO;

	case ATA_CMD_DSM:
	case ATA_CMD_DOWNLOAD_MICRO_DMA:
	case ATA_CMD_PMP_READ_DMA:
	case ATA_CMD_PMP_WRITE_DMA:
	case ATA_CMD_READ:
	case ATA_CMD_READ_EXT:
	case ATA_CMD_READ_LOG_DMA_EXT:
	case ATA_CMD_READ_STREAM_DMA_EXT:
	case ATA_CMD_TRUSTED_RCV_DMA:
	case ATA_CMD_TRUSTED_SND_DMA:
	case ATA_CMD_WRITE:
	case ATA_CMD_WRITE_EXT:
	case ATA_CMD_WRITE_FUA_EXT:
	case ATA_CMD_WRITE_QUEUED:
	case ATA_CMD_WRITE_LOG_DMA_EXT:
	case ATA_CMD_WRITE_STREAM_DMA_EXT:
	case ATA_CMD_ZAC_MGMT_IN:
		return HISI_SAS_SATA_PROTOCOL_DMA;

	case ATA_CMD_CHK_POWER:
	case ATA_CMD_DEV_RESET:
	case ATA_CMD_EDD:
	case ATA_CMD_FLUSH:
	case ATA_CMD_FLUSH_EXT:
	case ATA_CMD_VERIFY:
	case ATA_CMD_VERIFY_EXT:
	case ATA_CMD_SET_FEATURES:
	case ATA_CMD_STANDBY:
	case ATA_CMD_STANDBYNOW1:
	case ATA_CMD_ZAC_MGMT_OUT:
		return HISI_SAS_SATA_PROTOCOL_NONDATA;

	case ATA_CMD_SET_MAX:
		switch (fis->features) {
		case ATA_SET_MAX_PASSWD:
		case ATA_SET_MAX_LOCK:
			return HISI_SAS_SATA_PROTOCOL_PIO;

		case ATA_SET_MAX_PASSWD_DMA:
		case ATA_SET_MAX_UNLOCK_DMA:
			return HISI_SAS_SATA_PROTOCOL_DMA;

		default:
			return HISI_SAS_SATA_PROTOCOL_NONDATA;
		}

	default:
	{
		if (direction == DMA_NONE)
			return HISI_SAS_SATA_PROTOCOL_NONDATA;
		return HISI_SAS_SATA_PROTOCOL_PIO;
	}
	}
}
EXPORT_SYMBOL_GPL(hisi_sas_get_ata_protocol);

void hisi_sas_sata_done(struct sas_task *task,
			    struct hisi_sas_slot *slot)
{
	struct task_status_struct *ts = &task->task_status;
	struct ata_task_resp *resp = (struct ata_task_resp *)ts->buf;
	struct hisi_sas_status_buffer *status_buf =
			hisi_sas_status_buf_addr_mem(slot);
	u8 *iu = &status_buf->iu[0];
	struct dev_to_host_fis *d2h =  (struct dev_to_host_fis *)iu;

	resp->frame_len = sizeof(struct dev_to_host_fis);
	memcpy(&resp->ending_fis[0], d2h, sizeof(struct dev_to_host_fis));

	ts->buf_valid_size = sizeof(*resp);
}
EXPORT_SYMBOL_GPL(hisi_sas_sata_done);

/*
 * This function assumes linkrate mask fits in 8 bits, which it
 * does for all HW versions supported.
 */
u8 hisi_sas_get_prog_phy_linkrate_mask(enum sas_linkrate max)
{
	u8 rate = 0;
	int i;

	max -= SAS_LINK_RATE_1_5_GBPS;
	for (i = 0; i <= max; i++)
		rate |= 1 << (i * 2);
	return rate;
}
EXPORT_SYMBOL_GPL(hisi_sas_get_prog_phy_linkrate_mask);

static struct hisi_hba *dev_to_hisi_hba(struct domain_device *device)
{
	return device->port->ha->lldd_ha;
}

struct hisi_sas_port *to_hisi_sas_port(struct asd_sas_port *sas_port)
{
	return container_of(sas_port, struct hisi_sas_port, sas_port);
}
EXPORT_SYMBOL_GPL(to_hisi_sas_port);

void hisi_sas_stop_phys(struct hisi_hba *hisi_hba)
{
	int phy_no;

	for (phy_no = 0; phy_no < hisi_hba->n_phy; phy_no++)
		hisi_sas_phy_enable(hisi_hba, phy_no, 0);
}
EXPORT_SYMBOL_GPL(hisi_sas_stop_phys);

static void hisi_sas_slot_index_clear(struct hisi_hba *hisi_hba, int slot_idx)
{
	void *bitmap = hisi_hba->slot_index_tags;

	__clear_bit(slot_idx, bitmap);
}

static void hisi_sas_slot_index_free(struct hisi_hba *hisi_hba, int slot_idx)
{
	if (hisi_hba->hw->slot_index_alloc ||
	    slot_idx >= HISI_SAS_UNRESERVED_IPTT) {
		spin_lock(&hisi_hba->lock);
		hisi_sas_slot_index_clear(hisi_hba, slot_idx);
		spin_unlock(&hisi_hba->lock);
	}
}

static void hisi_sas_slot_index_set(struct hisi_hba *hisi_hba, int slot_idx)
{
	void *bitmap = hisi_hba->slot_index_tags;

	__set_bit(slot_idx, bitmap);
}

static int hisi_sas_slot_index_alloc(struct hisi_hba *hisi_hba,
				     struct scsi_cmnd *scsi_cmnd)
{
	int index;
	void *bitmap = hisi_hba->slot_index_tags;

	if (scsi_cmnd)
		return scsi_cmd_to_rq(scsi_cmnd)->tag;

	spin_lock(&hisi_hba->lock);
	index = find_next_zero_bit(bitmap, hisi_hba->slot_index_count,
				   hisi_hba->last_slot_index + 1);
	if (index >= hisi_hba->slot_index_count) {
		index = find_next_zero_bit(bitmap,
				hisi_hba->slot_index_count,
				HISI_SAS_UNRESERVED_IPTT);
		if (index >= hisi_hba->slot_index_count) {
			spin_unlock(&hisi_hba->lock);
			return -SAS_QUEUE_FULL;
		}
	}
	hisi_sas_slot_index_set(hisi_hba, index);
	hisi_hba->last_slot_index = index;
	spin_unlock(&hisi_hba->lock);

	return index;
}

void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba, struct sas_task *task,
			     struct hisi_sas_slot *slot)
{
	int device_id = slot->device_id;
	struct hisi_sas_device *sas_dev = &hisi_hba->devices[device_id];

	if (task) {
		struct device *dev = hisi_hba->dev;

		if (!task->lldd_task)
			return;

		task->lldd_task = NULL;

		if (!sas_protocol_ata(task->task_proto)) {
			if (slot->n_elem) {
				if (task->task_proto & SAS_PROTOCOL_SSP)
					dma_unmap_sg(dev, task->scatter,
						     task->num_scatter,
						     task->data_dir);
				else
					dma_unmap_sg(dev, &task->smp_task.smp_req,
						     1, DMA_TO_DEVICE);
			}
			if (slot->n_elem_dif) {
				struct sas_ssp_task *ssp_task = &task->ssp_task;
				struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;

				dma_unmap_sg(dev, scsi_prot_sglist(scsi_cmnd),
					     scsi_prot_sg_count(scsi_cmnd),
					     task->data_dir);
			}
		}
	}

	spin_lock(&sas_dev->lock);
	list_del_init(&slot->entry);
	spin_unlock(&sas_dev->lock);

	memset(slot, 0, offsetof(struct hisi_sas_slot, buf));

	hisi_sas_slot_index_free(hisi_hba, slot->idx);
}
EXPORT_SYMBOL_GPL(hisi_sas_slot_task_free);

static void hisi_sas_task_prep_smp(struct hisi_hba *hisi_hba,
				  struct hisi_sas_slot *slot)
{
	hisi_hba->hw->prep_smp(hisi_hba, slot);
}

static void hisi_sas_task_prep_ssp(struct hisi_hba *hisi_hba,
				  struct hisi_sas_slot *slot)
{
	hisi_hba->hw->prep_ssp(hisi_hba, slot);
}

static void hisi_sas_task_prep_ata(struct hisi_hba *hisi_hba,
				  struct hisi_sas_slot *slot)
{
	hisi_hba->hw->prep_stp(hisi_hba, slot);
}

static void hisi_sas_task_prep_abort(struct hisi_hba *hisi_hba,
				     struct hisi_sas_slot *slot)
{
	hisi_hba->hw->prep_abort(hisi_hba, slot);
}

static void hisi_sas_dma_unmap(struct hisi_hba *hisi_hba,
			       struct sas_task *task, int n_elem)
{
	struct device *dev = hisi_hba->dev;

	if (!sas_protocol_ata(task->task_proto) && n_elem) {
		if (task->num_scatter) {
			dma_unmap_sg(dev, task->scatter, task->num_scatter,
				     task->data_dir);
		} else if (task->task_proto & SAS_PROTOCOL_SMP) {
			dma_unmap_sg(dev, &task->smp_task.smp_req,
				     1, DMA_TO_DEVICE);
		}
	}
}

static int hisi_sas_dma_map(struct hisi_hba *hisi_hba,
			    struct sas_task *task, int *n_elem)
{
	struct device *dev = hisi_hba->dev;
	int rc;

	if (sas_protocol_ata(task->task_proto)) {
		*n_elem = task->num_scatter;
	} else {
		unsigned int req_len;

		if (task->num_scatter) {
			*n_elem = dma_map_sg(dev, task->scatter,
					     task->num_scatter, task->data_dir);
			if (!*n_elem) {
				rc = -ENOMEM;
				goto prep_out;
			}
		} else if (task->task_proto & SAS_PROTOCOL_SMP) {
			*n_elem = dma_map_sg(dev, &task->smp_task.smp_req,
					     1, DMA_TO_DEVICE);
			if (!*n_elem) {
				rc = -ENOMEM;
				goto prep_out;
			}
			req_len = sg_dma_len(&task->smp_task.smp_req);
			if (req_len & 0x3) {
				rc = -EINVAL;
				goto err_out_dma_unmap;
			}
		}
	}

	if (*n_elem > HISI_SAS_SGE_PAGE_CNT) {
		dev_err(dev, "task prep: n_elem(%d) > HISI_SAS_SGE_PAGE_CNT\n",
			*n_elem);
		rc = -EINVAL;
		goto err_out_dma_unmap;
	}
	return 0;

err_out_dma_unmap:
	/* It would be better to call dma_unmap_sg() here, but it's messy */
	hisi_sas_dma_unmap(hisi_hba, task, *n_elem);
prep_out:
	return rc;
}

static void hisi_sas_dif_dma_unmap(struct hisi_hba *hisi_hba,
				   struct sas_task *task, int n_elem_dif)
{
	struct device *dev = hisi_hba->dev;

	if (n_elem_dif) {
		struct sas_ssp_task *ssp_task = &task->ssp_task;
		struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;

		dma_unmap_sg(dev, scsi_prot_sglist(scsi_cmnd),
			     scsi_prot_sg_count(scsi_cmnd),
			     task->data_dir);
	}
}

static int hisi_sas_dif_dma_map(struct hisi_hba *hisi_hba,
				int *n_elem_dif, struct sas_task *task)
{
	struct device *dev = hisi_hba->dev;
	struct sas_ssp_task *ssp_task;
	struct scsi_cmnd *scsi_cmnd;
	int rc;

	if (task->num_scatter) {
		ssp_task = &task->ssp_task;
		scsi_cmnd = ssp_task->cmd;

		if (scsi_prot_sg_count(scsi_cmnd)) {
			*n_elem_dif = dma_map_sg(dev,
						 scsi_prot_sglist(scsi_cmnd),
						 scsi_prot_sg_count(scsi_cmnd),
						 task->data_dir);

			if (!*n_elem_dif)
				return -ENOMEM;

			if (*n_elem_dif > HISI_SAS_SGE_DIF_PAGE_CNT) {
				dev_err(dev, "task prep: n_elem_dif(%d) too large\n",
					*n_elem_dif);
				rc = -EINVAL;
				goto err_out_dif_dma_unmap;
			}
		}
	}

	return 0;

err_out_dif_dma_unmap:
	dma_unmap_sg(dev, scsi_prot_sglist(scsi_cmnd),
		     scsi_prot_sg_count(scsi_cmnd), task->data_dir);
	return rc;
}

static
void hisi_sas_task_deliver(struct hisi_hba *hisi_hba,
			   struct hisi_sas_slot *slot,
			   struct hisi_sas_dq *dq,
			   struct hisi_sas_device *sas_dev)
{
	struct hisi_sas_cmd_hdr *cmd_hdr_base;
	int dlvry_queue_slot, dlvry_queue;
	struct sas_task *task = slot->task;
	int wr_q_index;

	spin_lock(&dq->lock);
	wr_q_index = dq->wr_point;
	dq->wr_point = (dq->wr_point + 1) % HISI_SAS_QUEUE_SLOTS;
	list_add_tail(&slot->delivery, &dq->list);
	spin_unlock(&dq->lock);
	spin_lock(&sas_dev->lock);
	list_add_tail(&slot->entry, &sas_dev->list);
	spin_unlock(&sas_dev->lock);

	dlvry_queue = dq->id;
	dlvry_queue_slot = wr_q_index;

	slot->device_id = sas_dev->device_id;
	slot->dlvry_queue = dlvry_queue;
	slot->dlvry_queue_slot = dlvry_queue_slot;
	cmd_hdr_base = hisi_hba->cmd_hdr[dlvry_queue];
	slot->cmd_hdr = &cmd_hdr_base[dlvry_queue_slot];

	task->lldd_task = slot;

	memset(slot->cmd_hdr, 0, sizeof(struct hisi_sas_cmd_hdr));
	memset(hisi_sas_cmd_hdr_addr_mem(slot), 0, HISI_SAS_COMMAND_TABLE_SZ);
	memset(hisi_sas_status_buf_addr_mem(slot), 0,
	       sizeof(struct hisi_sas_err_record));

	switch (task->task_proto) {
	case SAS_PROTOCOL_SMP:
		hisi_sas_task_prep_smp(hisi_hba, slot);
		break;
	case SAS_PROTOCOL_SSP:
		hisi_sas_task_prep_ssp(hisi_hba, slot);
		break;
	case SAS_PROTOCOL_SATA:
	case SAS_PROTOCOL_STP:
	case SAS_PROTOCOL_STP_ALL:
		hisi_sas_task_prep_ata(hisi_hba, slot);
		break;
	case SAS_PROTOCOL_INTERNAL_ABORT:
		hisi_sas_task_prep_abort(hisi_hba, slot);
		break;
	default:
		return;
	}

	/* Make slot memories observable before marking as ready */
	smp_wmb();
	WRITE_ONCE(slot->ready, 1);

	spin_lock(&dq->lock);
	hisi_hba->hw->start_delivery(dq);
	spin_unlock(&dq->lock);
}

static int hisi_sas_queue_command(struct sas_task *task, gfp_t gfp_flags)
{
	int n_elem = 0, n_elem_dif = 0;
	struct domain_device *device = task->dev;
	struct asd_sas_port *sas_port = device->port;
	struct hisi_sas_device *sas_dev = device->lldd_dev;
	bool internal_abort = sas_is_internal_abort(task);
	struct scsi_cmnd *scmd = NULL;
	struct hisi_sas_dq *dq = NULL;
	struct hisi_sas_port *port;
	struct hisi_hba *hisi_hba;
	struct hisi_sas_slot *slot;
	struct device *dev;
	int rc;

	if (!sas_port) {
		struct task_status_struct *ts = &task->task_status;

		ts->resp = SAS_TASK_UNDELIVERED;
		ts->stat = SAS_PHY_DOWN;
		/*
		 * libsas will use dev->port, should
		 * not call task_done for sata
		 */
		if (device->dev_type != SAS_SATA_DEV && !internal_abort)
			task->task_done(task);
		return -ECOMM;
	}

	hisi_hba = dev_to_hisi_hba(device);
	dev = hisi_hba->dev;

	switch (task->task_proto) {
	case SAS_PROTOCOL_SSP:
	case SAS_PROTOCOL_SMP:
	case SAS_PROTOCOL_SATA:
	case SAS_PROTOCOL_STP:
	case SAS_PROTOCOL_STP_ALL:
		if (unlikely(test_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags))) {
			if (!gfpflags_allow_blocking(gfp_flags))
				return -EINVAL;

			down(&hisi_hba->sem);
			up(&hisi_hba->sem);
		}

		if (DEV_IS_GONE(sas_dev)) {
			if (sas_dev)
				dev_info(dev, "task prep: device %d not ready\n",
					 sas_dev->device_id);
			else
				dev_info(dev, "task prep: device %016llx not ready\n",
					 SAS_ADDR(device->sas_addr));

			return -ECOMM;
		}

		port = to_hisi_sas_port(sas_port);
		if (!port->port_attached) {
			dev_info(dev, "task prep: %s port%d not attach device\n",
				 dev_is_sata(device) ? "SATA/STP" : "SAS",
				 device->port->id);

				return -ECOMM;
		}

		if (task->uldd_task) {
			struct ata_queued_cmd *qc;

			if (dev_is_sata(device)) {
				qc = task->uldd_task;
				scmd = qc->scsicmd;
			} else {
				scmd = task->uldd_task;
			}
		}

		if (scmd) {
			unsigned int dq_index;
			u32 blk_tag;

			blk_tag = blk_mq_unique_tag(scsi_cmd_to_rq(scmd));
			dq_index = blk_mq_unique_tag_to_hwq(blk_tag);
			dq = &hisi_hba->dq[dq_index];
		} else {
			struct Scsi_Host *shost = hisi_hba->shost;
			struct blk_mq_queue_map *qmap = &shost->tag_set.map[HCTX_TYPE_DEFAULT];
			int queue = qmap->mq_map[raw_smp_processor_id()];

			dq = &hisi_hba->dq[queue];
		}
		break;
	case SAS_PROTOCOL_INTERNAL_ABORT:
		if (!hisi_hba->hw->prep_abort)
			return TMF_RESP_FUNC_FAILED;

		if (test_bit(HISI_SAS_HW_FAULT_BIT, &hisi_hba->flags))
			return -EIO;

		hisi_hba = dev_to_hisi_hba(device);

		if (unlikely(test_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags)))
			return -EINVAL;

		port = to_hisi_sas_port(sas_port);
		dq = &hisi_hba->dq[task->abort_task.qid];
		break;
	default:
		dev_err(hisi_hba->dev, "task prep: unknown/unsupported proto (0x%x)\n",
			task->task_proto);
		return -EINVAL;
	}

	rc = hisi_sas_dma_map(hisi_hba, task, &n_elem);
	if (rc < 0)
		goto prep_out;

	if (!sas_protocol_ata(task->task_proto)) {
		rc = hisi_sas_dif_dma_map(hisi_hba, &n_elem_dif, task);
		if (rc < 0)
			goto err_out_dma_unmap;
	}

	if (!internal_abort && hisi_hba->hw->slot_index_alloc)
		rc = hisi_hba->hw->slot_index_alloc(hisi_hba, device);
	else
		rc = hisi_sas_slot_index_alloc(hisi_hba, scmd);

	if (rc < 0)
		goto err_out_dif_dma_unmap;

	slot = &hisi_hba->slot_info[rc];
	slot->n_elem = n_elem;
	slot->n_elem_dif = n_elem_dif;
	slot->task = task;
	slot->port = port;

	slot->tmf = task->tmf;
	slot->is_internal = !!task->tmf || internal_abort;

	/* protect task_prep and start_delivery sequence */
	hisi_sas_task_deliver(hisi_hba, slot, dq, sas_dev);

	return 0;

err_out_dif_dma_unmap:
	if (!sas_protocol_ata(task->task_proto))
		hisi_sas_dif_dma_unmap(hisi_hba, task, n_elem_dif);
err_out_dma_unmap:
	hisi_sas_dma_unmap(hisi_hba, task, n_elem);
prep_out:
	dev_err(dev, "task exec: failed[%d]!\n", rc);
	return rc;
}

static void hisi_sas_bytes_dmaed(struct hisi_hba *hisi_hba, int phy_no,
				 gfp_t gfp_flags)
{
	struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
	struct asd_sas_phy *sas_phy = &phy->sas_phy;

	if (!phy->phy_attached)
		return;

	sas_notify_phy_event(sas_phy, PHYE_OOB_DONE, gfp_flags);

	if (sas_phy->phy) {
		struct sas_phy *sphy = sas_phy->phy;

		sphy->negotiated_linkrate = sas_phy->linkrate;
		sphy->minimum_linkrate_hw = SAS_LINK_RATE_1_5_GBPS;
		sphy->maximum_linkrate_hw =
			hisi_hba->hw->phy_get_max_linkrate();
		if (sphy->minimum_linkrate == SAS_LINK_RATE_UNKNOWN)
			sphy->minimum_linkrate = phy->minimum_linkrate;

		if (sphy->maximum_linkrate == SAS_LINK_RATE_UNKNOWN)
			sphy->maximum_linkrate = phy->maximum_linkrate;
	}

	if (phy->phy_type & PORT_TYPE_SAS) {
		struct sas_identify_frame *id;

		id = (struct sas_identify_frame *)phy->frame_rcvd;
		id->dev_type = phy->identify.device_type;
		id->initiator_bits = SAS_PROTOCOL_ALL;
		id->target_bits = phy->identify.target_port_protocols;
	} else if (phy->phy_type & PORT_TYPE_SATA) {
		/* Nothing */
	}

	sas_phy->frame_rcvd_size = phy->frame_rcvd_size;
	sas_notify_port_event(sas_phy, PORTE_BYTES_DMAED, gfp_flags);
}

static struct hisi_sas_device *hisi_sas_alloc_dev(struct domain_device *device)
{
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
	struct hisi_sas_device *sas_dev = NULL;
	int last = hisi_hba->last_dev_id;
	int first = (hisi_hba->last_dev_id + 1) % HISI_SAS_MAX_DEVICES;
	int i;

	spin_lock(&hisi_hba->lock);
	for (i = first; i != last; i %= HISI_SAS_MAX_DEVICES) {
		if (hisi_hba->devices[i].dev_type == SAS_PHY_UNUSED) {
			int queue = i % hisi_hba->queue_count;
			struct hisi_sas_dq *dq = &hisi_hba->dq[queue];

			hisi_hba->devices[i].device_id = i;
			sas_dev = &hisi_hba->devices[i];
			sas_dev->dev_status = HISI_SAS_DEV_INIT;
			sas_dev->dev_type = device->dev_type;
			sas_dev->hisi_hba = hisi_hba;
			sas_dev->sas_device = device;
			sas_dev->dq = dq;
			spin_lock_init(&sas_dev->lock);
			INIT_LIST_HEAD(&hisi_hba->devices[i].list);
			break;
		}
		i++;
	}
	hisi_hba->last_dev_id = i;
	spin_unlock(&hisi_hba->lock);

	return sas_dev;
}

static void hisi_sas_tmf_aborted(struct sas_task *task)
{
	struct hisi_sas_slot *slot = task->lldd_task;
	struct domain_device *device = task->dev;
	struct hisi_sas_device *sas_dev = device->lldd_dev;
	struct hisi_hba *hisi_hba = sas_dev->hisi_hba;

	if (slot) {
		struct hisi_sas_cq *cq =
			   &hisi_hba->cq[slot->dlvry_queue];
		/*
		 * sync irq to avoid free'ing task
		 * before using task in IO completion
		 */
		synchronize_irq(cq->irq_no);
		slot->task = NULL;
	}
}

#define HISI_SAS_DISK_RECOVER_CNT 3
static int hisi_sas_init_device(struct domain_device *device)
{
	int rc = TMF_RESP_FUNC_COMPLETE;
	struct scsi_lun lun;
	int retry = HISI_SAS_DISK_RECOVER_CNT;
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);

	switch (device->dev_type) {
	case SAS_END_DEVICE:
		int_to_scsilun(0, &lun);

		while (retry-- > 0) {
			rc = sas_clear_task_set(device, lun.scsi_lun);
			if (rc == TMF_RESP_FUNC_COMPLETE) {
				hisi_sas_release_task(hisi_hba, device);
				break;
			}
		}
		break;
	case SAS_SATA_DEV:
	case SAS_SATA_PM:
	case SAS_SATA_PM_PORT:
	case SAS_SATA_PENDING:
		/*
		 * If an expander is swapped when a SATA disk is attached then
		 * we should issue a hard reset to clear previous affiliation
		 * of STP target port, see SPL (chapter 6.19.4).
		 *
		 * However we don't need to issue a hard reset here for these
		 * reasons:
		 * a. When probing the device, libsas/libata already issues a
		 * hard reset in sas_probe_sata() -> ata_sas_async_probe().
		 * Note that in hisi_sas_debug_I_T_nexus_reset() we take care
		 * to issue a hard reset by checking the dev status (== INIT).
		 * b. When resetting the controller, this is simply unnecessary.
		 */
		while (retry-- > 0) {
			rc = hisi_sas_softreset_ata_disk(device);
			if (!rc)
				break;
		}
		break;
	default:
		break;
	}

	return rc;
}

int hisi_sas_slave_alloc(struct scsi_device *sdev)
{
	struct domain_device *ddev = sdev_to_domain_dev(sdev);
	struct hisi_sas_device *sas_dev = ddev->lldd_dev;
	int rc;

	rc = sas_slave_alloc(sdev);
	if (rc)
		return rc;

	rc = hisi_sas_init_device(ddev);
	if (rc)
		return rc;
	sas_dev->dev_status = HISI_SAS_DEV_NORMAL;
	return 0;
}
EXPORT_SYMBOL_GPL(hisi_sas_slave_alloc);

static int hisi_sas_dev_found(struct domain_device *device)
{
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
	struct domain_device *parent_dev = device->parent;
	struct hisi_sas_device *sas_dev;
	struct device *dev = hisi_hba->dev;
	int rc;

	if (hisi_hba->hw->alloc_dev)
		sas_dev = hisi_hba->hw->alloc_dev(device);
	else
		sas_dev = hisi_sas_alloc_dev(device);
	if (!sas_dev) {
		dev_err(dev, "fail alloc dev: max support %d devices\n",
			HISI_SAS_MAX_DEVICES);
		return -EINVAL;
	}

	device->lldd_dev = sas_dev;
	hisi_hba->hw->setup_itct(hisi_hba, sas_dev);

	if (parent_dev && dev_is_expander(parent_dev->dev_type)) {
		int phy_no;
		u8 phy_num = parent_dev->ex_dev.num_phys;
		struct ex_phy *phy;

		for (phy_no = 0; phy_no < phy_num; phy_no++) {
			phy = &parent_dev->ex_dev.ex_phy[phy_no];
			if (SAS_ADDR(phy->attached_sas_addr) ==
				SAS_ADDR(device->sas_addr))
				break;
		}

		if (phy_no == phy_num) {
			dev_info(dev, "dev found: no attached "
				 "dev:%016llx at ex:%016llx\n",
				 SAS_ADDR(device->sas_addr),
				 SAS_ADDR(parent_dev->sas_addr));
			rc = -EINVAL;
			goto err_out;
		}
	}

	dev_info(dev, "dev[%d:%x] found\n",
		sas_dev->device_id, sas_dev->dev_type);

	return 0;

err_out:
	hisi_sas_dev_gone(device);
	return rc;
}

int hisi_sas_slave_configure(struct scsi_device *sdev)
{
	struct domain_device *dev = sdev_to_domain_dev(sdev);
	int ret = sas_slave_configure(sdev);

	if (ret)
		return ret;
	if (!dev_is_sata(dev))
		sas_change_queue_depth(sdev, 64);

	return 0;
}
EXPORT_SYMBOL_GPL(hisi_sas_slave_configure);

void hisi_sas_scan_start(struct Scsi_Host *shost)
{
	struct hisi_hba *hisi_hba = shost_priv(shost);

	hisi_hba->hw->phys_init(hisi_hba);
}
EXPORT_SYMBOL_GPL(hisi_sas_scan_start);

int hisi_sas_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
	struct hisi_hba *hisi_hba = shost_priv(shost);
	struct sas_ha_struct *sha = &hisi_hba->sha;

	/* Wait for PHY up interrupt to occur */
	if (time < HZ)
		return 0;

	sas_drain_work(sha);
	return 1;
}
EXPORT_SYMBOL_GPL(hisi_sas_scan_finished);

static void hisi_sas_phyup_work_common(struct work_struct *work,
		enum hisi_sas_phy_event event)
{
	struct hisi_sas_phy *phy =
		container_of(work, typeof(*phy), works[event]);
	struct hisi_hba *hisi_hba = phy->hisi_hba;
	struct asd_sas_phy *sas_phy = &phy->sas_phy;
	int phy_no = sas_phy->id;

	phy->wait_phyup_cnt = 0;
	if (phy->identify.target_port_protocols == SAS_PROTOCOL_SSP)
		hisi_hba->hw->sl_notify_ssp(hisi_hba, phy_no);
	hisi_sas_bytes_dmaed(hisi_hba, phy_no, GFP_KERNEL);
}

static void hisi_sas_phyup_work(struct work_struct *work)
{
	hisi_sas_phyup_work_common(work, HISI_PHYE_PHY_UP);
}

static void hisi_sas_linkreset_work(struct work_struct *work)
{
	struct hisi_sas_phy *phy =
		container_of(work, typeof(*phy), works[HISI_PHYE_LINK_RESET]);
	struct asd_sas_phy *sas_phy = &phy->sas_phy;

	hisi_sas_control_phy(sas_phy, PHY_FUNC_LINK_RESET, NULL);
}

static void hisi_sas_phyup_pm_work(struct work_struct *work)
{
	struct hisi_sas_phy *phy =
		container_of(work, typeof(*phy), works[HISI_PHYE_PHY_UP_PM]);
	struct hisi_hba *hisi_hba = phy->hisi_hba;
	struct device *dev = hisi_hba->dev;

	hisi_sas_phyup_work_common(work, HISI_PHYE_PHY_UP_PM);
	pm_runtime_put_sync(dev);
}

static const work_func_t hisi_sas_phye_fns[HISI_PHYES_NUM] = {
	[HISI_PHYE_PHY_UP] = hisi_sas_phyup_work,
	[HISI_PHYE_LINK_RESET] = hisi_sas_linkreset_work,
	[HISI_PHYE_PHY_UP_PM] = hisi_sas_phyup_pm_work,
};

bool hisi_sas_notify_phy_event(struct hisi_sas_phy *phy,
				enum hisi_sas_phy_event event)
{
	struct hisi_hba *hisi_hba = phy->hisi_hba;

	if (WARN_ON(event >= HISI_PHYES_NUM))
		return false;

	return queue_work(hisi_hba->wq, &phy->works[event]);
}
EXPORT_SYMBOL_GPL(hisi_sas_notify_phy_event);

static void hisi_sas_wait_phyup_timedout(struct timer_list *t)
{
	struct hisi_sas_phy *phy = from_timer(phy, t, timer);
	struct hisi_hba *hisi_hba = phy->hisi_hba;
	struct device *dev = hisi_hba->dev;
	int phy_no = phy->sas_phy.id;

	dev_warn(dev, "phy%d wait phyup timeout, issuing link reset\n", phy_no);
	hisi_sas_notify_phy_event(phy, HISI_PHYE_LINK_RESET);
}

#define HISI_SAS_WAIT_PHYUP_RETRIES	10

void hisi_sas_phy_oob_ready(struct hisi_hba *hisi_hba, int phy_no)
{
	struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
	struct device *dev = hisi_hba->dev;
	unsigned long flags;

	dev_dbg(dev, "phy%d OOB ready\n", phy_no);
	spin_lock_irqsave(&phy->lock, flags);
	if (phy->phy_attached) {
		spin_unlock_irqrestore(&phy->lock, flags);
		return;
	}

	if (!timer_pending(&phy->timer)) {
		if (phy->wait_phyup_cnt < HISI_SAS_WAIT_PHYUP_RETRIES) {
			phy->wait_phyup_cnt++;
			phy->timer.expires = jiffies +
					     HISI_SAS_WAIT_PHYUP_TIMEOUT;
			add_timer(&phy->timer);
			spin_unlock_irqrestore(&phy->lock, flags);
			return;
		}

		dev_warn(dev, "phy%d failed to come up %d times, giving up\n",
			 phy_no, phy->wait_phyup_cnt);
		phy->wait_phyup_cnt = 0;
	}
	spin_unlock_irqrestore(&phy->lock, flags);
}

EXPORT_SYMBOL_GPL(hisi_sas_phy_oob_ready);

static void hisi_sas_phy_init(struct hisi_hba *hisi_hba, int phy_no)
{
	struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
	struct asd_sas_phy *sas_phy = &phy->sas_phy;
	int i;

	phy->hisi_hba = hisi_hba;
	phy->port = NULL;
	phy->minimum_linkrate = SAS_LINK_RATE_1_5_GBPS;
	phy->maximum_linkrate = hisi_hba->hw->phy_get_max_linkrate();
	sas_phy->enabled = (phy_no < hisi_hba->n_phy) ? 1 : 0;
	sas_phy->class = SAS;
	sas_phy->iproto = SAS_PROTOCOL_ALL;
	sas_phy->tproto = 0;
	sas_phy->type = PHY_TYPE_PHYSICAL;
	sas_phy->role = PHY_ROLE_INITIATOR;
	sas_phy->oob_mode = OOB_NOT_CONNECTED;
	sas_phy->linkrate = SAS_LINK_RATE_UNKNOWN;
	sas_phy->id = phy_no;
	sas_phy->sas_addr = &hisi_hba->sas_addr[0];
	sas_phy->frame_rcvd = &phy->frame_rcvd[0];
	sas_phy->ha = (struct sas_ha_struct *)hisi_hba->shost->hostdata;
	sas_phy->lldd_phy = phy;

	for (i = 0; i < HISI_PHYES_NUM; i++)
		INIT_WORK(&phy->works[i], hisi_sas_phye_fns[i]);

	spin_lock_init(&phy->lock);

	timer_setup(&phy->timer, hisi_sas_wait_phyup_timedout, 0);
}

/* Wrapper to ensure we track hisi_sas_phy.enable properly */
void hisi_sas_phy_enable(struct hisi_hba *hisi_hba, int phy_no, int enable)
{
	struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
	struct asd_sas_phy *aphy = &phy->sas_phy;
	struct sas_phy *sphy = aphy->phy;
	unsigned long flags;

	spin_lock_irqsave(&phy->lock, flags);

	if (enable) {
		/* We may have been enabled already; if so, don't touch */
		if (!phy->enable)
			sphy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
		hisi_hba->hw->phy_start(hisi_hba, phy_no);
	} else {
		sphy->negotiated_linkrate = SAS_PHY_DISABLED;
		hisi_hba->hw->phy_disable(hisi_hba, phy_no);
	}
	phy->enable = enable;
	spin_unlock_irqrestore(&phy->lock, flags);
}
EXPORT_SYMBOL_GPL(hisi_sas_phy_enable);

static void hisi_sas_port_notify_formed(struct asd_sas_phy *sas_phy)
{
	struct sas_ha_struct *sas_ha = sas_phy->ha;
	struct hisi_hba *hisi_hba = sas_ha->lldd_ha;
	struct hisi_sas_phy *phy = sas_phy->lldd_phy;
	struct asd_sas_port *sas_port = sas_phy->port;
	struct hisi_sas_port *port;
	unsigned long flags;

	if (!sas_port)
		return;

	port = to_hisi_sas_port(sas_port);
	spin_lock_irqsave(&hisi_hba->lock, flags);
	port->port_attached = 1;
	port->id = phy->port_id;
	phy->port = port;
	sas_port->lldd_port = port;
	spin_unlock_irqrestore(&hisi_hba->lock, flags);
}

static void hisi_sas_do_release_task(struct hisi_hba *hisi_hba, struct sas_task *task,
				     struct hisi_sas_slot *slot)
{
	if (task) {
		unsigned long flags;
		struct task_status_struct *ts;

		ts = &task->task_status;

		ts->resp = SAS_TASK_COMPLETE;
		ts->stat = SAS_ABORTED_TASK;
		spin_lock_irqsave(&task->task_state_lock, flags);
		task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
		if (!slot->is_internal && task->task_proto != SAS_PROTOCOL_SMP)
			task->task_state_flags |= SAS_TASK_STATE_DONE;
		spin_unlock_irqrestore(&task->task_state_lock, flags);
	}

	hisi_sas_slot_task_free(hisi_hba, task, slot);
}

static void hisi_sas_release_task(struct hisi_hba *hisi_hba,
			struct domain_device *device)
{
	struct hisi_sas_slot *slot, *slot2;
	struct hisi_sas_device *sas_dev = device->lldd_dev;

	list_for_each_entry_safe(slot, slot2, &sas_dev->list, entry)
		hisi_sas_do_release_task(hisi_hba, slot->task, slot);
}

void hisi_sas_release_tasks(struct hisi_hba *hisi_hba)
{
	struct hisi_sas_device *sas_dev;
	struct domain_device *device;
	int i;

	for (i = 0; i < HISI_SAS_MAX_DEVICES; i++) {
		sas_dev = &hisi_hba->devices[i];
		device = sas_dev->sas_device;

		if ((sas_dev->dev_type == SAS_PHY_UNUSED) ||
		    !device)
			continue;

		hisi_sas_release_task(hisi_hba, device);
	}
}
EXPORT_SYMBOL_GPL(hisi_sas_release_tasks);

static void hisi_sas_dereg_device(struct hisi_hba *hisi_hba,
				struct domain_device *device)
{
	if (hisi_hba->hw->dereg_device)
		hisi_hba->hw->dereg_device(hisi_hba, device);
}

static int
hisi_sas_internal_task_abort_dev(struct hisi_sas_device *sas_dev,
				 bool rst_ha_timeout)
{
	struct hisi_sas_internal_abort_data data = { rst_ha_timeout };
	struct domain_device *device = sas_dev->sas_device;
	struct hisi_hba *hisi_hba = sas_dev->hisi_hba;
	int i, rc;

	for (i = 0; i < hisi_hba->cq_nvecs; i++) {
		struct hisi_sas_cq *cq = &hisi_hba->cq[i];
		const struct cpumask *mask = cq->irq_mask;

		if (mask && !cpumask_intersects(cpu_online_mask, mask))
			continue;
		rc = sas_execute_internal_abort_dev(device, i, &data);
		if (rc)
			return rc;
	}

	return 0;
}

static void hisi_sas_dev_gone(struct domain_device *device)
{
	struct hisi_sas_device *sas_dev = device->lldd_dev;
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
	struct device *dev = hisi_hba->dev;
	int ret = 0;

	dev_info(dev, "dev[%d:%x] is gone\n",
		 sas_dev->device_id, sas_dev->dev_type);

	down(&hisi_hba->sem);
	if (!test_bit(HISI_SAS_RESETTING_BIT, &hisi_hba->flags)) {
		hisi_sas_internal_task_abort_dev(sas_dev, true);

		hisi_sas_dereg_device(hisi_hba, device);

		ret = hisi_hba->hw->clear_itct(hisi_hba, sas_dev);
		device->lldd_dev = NULL;
	}

	if (hisi_hba->hw->free_device)
		hisi_hba->hw->free_device(sas_dev);

	/* Don't mark it as SAS_PHY_UNUSED if failed to clear ITCT */
	if (!ret)
		sas_dev->dev_type = SAS_PHY_UNUSED;
	sas_dev->sas_device = NULL;
	up(&hisi_hba->sem);
}

static int hisi_sas_phy_set_linkrate(struct hisi_hba *hisi_hba, int phy_no,
			struct sas_phy_linkrates *r)
{
	struct sas_phy_linkrates _r;

	struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
	struct asd_sas_phy *sas_phy = &phy->sas_phy;
	enum sas_linkrate min, max;

	if (r->minimum_linkrate > SAS_LINK_RATE_1_5_GBPS)
		return -EINVAL;

	if (r->maximum_linkrate == SAS_LINK_RATE_UNKNOWN) {
		max = sas_phy->phy->maximum_linkrate;
		min = r->minimum_linkrate;
	} else if (r->minimum_linkrate == SAS_LINK_RATE_UNKNOWN) {
		max = r->maximum_linkrate;
		min = sas_phy->phy->minimum_linkrate;
	} else
		return -EINVAL;

	_r.maximum_linkrate = max;
	_r.minimum_linkrate = min;

	sas_phy->phy->maximum_linkrate = max;
	sas_phy->phy->minimum_linkrate = min;

	hisi_sas_phy_enable(hisi_hba, phy_no, 0);
	msleep(100);
	hisi_hba->hw->phy_set_linkrate(hisi_hba, phy_no, &_r);
	hisi_sas_phy_enable(hisi_hba, phy_no, 1);

	return 0;
}

static int hisi_sas_control_phy(struct asd_sas_phy *sas_phy, enum phy_func func,
				void *funcdata)
{
	struct hisi_sas_phy *phy = container_of(sas_phy,
			struct hisi_sas_phy, sas_phy);
	struct sas_ha_struct *sas_ha = sas_phy->ha;
	struct hisi_hba *hisi_hba = sas_ha->lldd_ha;
	struct device *dev = hisi_hba->dev;
	DECLARE_COMPLETION_ONSTACK(completion);
	int phy_no = sas_phy->id;
	u8 sts = phy->phy_attached;
	int ret = 0;

	down(&hisi_hba->sem);
	phy->reset_completion = &completion;

	switch (func) {
	case PHY_FUNC_HARD_RESET:
		hisi_hba->hw->phy_hard_reset(hisi_hba, phy_no);
		break;

	case PHY_FUNC_LINK_RESET:
		hisi_sas_phy_enable(hisi_hba, phy_no, 0);
		msleep(100);
		hisi_sas_phy_enable(hisi_hba, phy_no, 1);
		break;

	case PHY_FUNC_DISABLE:
		hisi_sas_phy_enable(hisi_hba, phy_no, 0);
		goto out;

	case PHY_FUNC_SET_LINK_RATE:
		ret = hisi_sas_phy_set_linkrate(hisi_hba, phy_no, funcdata);
		break;

	case PHY_FUNC_GET_EVENTS:
		if (hisi_hba->hw->get_events) {
			hisi_hba->hw->get_events(hisi_hba, phy_no);
			goto out;
		}
		fallthrough;
	case PHY_FUNC_RELEASE_SPINUP_HOLD:
	default:
		ret = -EOPNOTSUPP;
		goto out;
	}

	if (sts && !wait_for_completion_timeout(&completion,
		HISI_SAS_WAIT_PHYUP_TIMEOUT)) {
		dev_warn(dev, "phy%d wait phyup timed out for func %d\n",
			 phy_no, func);
		if (phy->in_reset)
			ret = -ETIMEDOUT;
	}

out:
	phy->reset_completion = NULL;

	up(&hisi_hba->sem);
	return ret;
}

static void hisi_sas_fill_ata_reset_cmd(struct ata_device *dev,
		bool reset, int pmp, u8 *fis)
{
	struct ata_taskfile tf;

	ata_tf_init(dev, &tf);
	if (reset)
		tf.ctl |= ATA_SRST;
	else
		tf.ctl &= ~ATA_SRST;
	tf.command = ATA_CMD_DEV_RESET;
	ata_tf_to_fis(&tf, pmp, 0, fis);
}

static int hisi_sas_softreset_ata_disk(struct domain_device *device)
{
	u8 fis[20] = {0};
	struct ata_port *ap = device->sata_dev.ap;
	struct ata_link *link;
	int rc = TMF_RESP_FUNC_FAILED;
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
	struct device *dev = hisi_hba->dev;

	ata_for_each_link(link, ap, EDGE) {
		int pmp = sata_srst_pmp(link);

		hisi_sas_fill_ata_reset_cmd(link->device, 1, pmp, fis);
		rc = sas_execute_ata_cmd(device, fis, -1);
		if (rc != TMF_RESP_FUNC_COMPLETE)
			break;
	}

	if (rc == TMF_RESP_FUNC_COMPLETE) {
		ata_for_each_link(link, ap, EDGE) {
			int pmp = sata_srst_pmp(link);

			hisi_sas_fill_ata_reset_cmd(link->device, 0, pmp, fis);
			rc = sas_execute_ata_cmd(device, fis, -1);
			if (rc != TMF_RESP_FUNC_COMPLETE)
				dev_err(dev, "ata disk %016llx de-reset failed\n",
					SAS_ADDR(device->sas_addr));
		}
	} else {
		dev_err(dev, "ata disk %016llx reset failed\n",
			SAS_ADDR(device->sas_addr));
	}

	if (rc == TMF_RESP_FUNC_COMPLETE)
		hisi_sas_release_task(hisi_hba, device);

	return rc;
}

static void hisi_sas_refresh_port_id(struct hisi_hba *hisi_hba)
{
	u32 state = hisi_hba->hw->get_phys_state(hisi_hba);
	int i;

	for (i = 0; i < HISI_SAS_MAX_DEVICES; i++) {
		struct hisi_sas_device *sas_dev = &hisi_hba->devices[i];
		struct domain_device *device = sas_dev->sas_device;
		struct asd_sas_port *sas_port;
		struct hisi_sas_port *port;
		struct hisi_sas_phy *phy = NULL;
		struct asd_sas_phy *sas_phy;

		if ((sas_dev->dev_type == SAS_PHY_UNUSED)
				|| !device || !device->port)
			continue;

		sas_port = device->port;
		port = to_hisi_sas_port(sas_port);

		spin_lock(&sas_port->phy_list_lock);
		list_for_each_entry(sas_phy, &sas_port->phy_list, port_phy_el)
			if (state & BIT(sas_phy->id)) {
				phy = sas_phy->lldd_phy;
				break;
			}
		spin_unlock(&sas_port->phy_list_lock);

		if (phy) {
			port->id = phy->port_id;

			/* Update linkrate of directly attached device. */
			if (!device->parent)
				device->linkrate = phy->sas_phy.linkrate;

			hisi_hba->hw->setup_itct(hisi_hba, sas_dev);
		} else
			port->id = 0xff;
	}
}

static void hisi_sas_rescan_topology(struct hisi_hba *hisi_hba, u32 state)
{
	struct sas_ha_struct *sas_ha = &hisi_hba->sha;
	struct asd_sas_port *_sas_port = NULL;
	int phy_no;

	for (phy_no = 0; phy_no < hisi_hba->n_phy; phy_no++) {
		struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
		struct asd_sas_phy *sas_phy = &phy->sas_phy;
		struct asd_sas_port *sas_port = sas_phy->port;
		bool do_port_check = _sas_port != sas_port;

		if (!sas_phy->phy->enabled)
			continue;

		/* Report PHY state change to libsas */
		if (state & BIT(phy_no)) {
			if (do_port_check && sas_port && sas_port->port_dev) {
				struct domain_device *dev = sas_port->port_dev;

				_sas_port = sas_port;

				if (dev_is_expander(dev->dev_type))
					sas_notify_port_event(sas_phy,
							PORTE_BROADCAST_RCVD,
							GFP_KERNEL);
			}
		} else {
			hisi_sas_phy_down(hisi_hba, phy_no, 0, GFP_KERNEL);
		}
	}
	/*
	 * Ensure any bcast events are processed prior to calling async nexus
	 * reset calls from hisi_sas_clear_nexus_ha() ->
	 * hisi_sas_async_I_T_nexus_reset()
	 */
	sas_drain_work(sas_ha);
}

static void hisi_sas_reset_init_all_devices(struct hisi_hba *hisi_hba)
{
	struct hisi_sas_device *sas_dev;
	struct domain_device *device;
	int i;

	for (i = 0; i < HISI_SAS_MAX_DEVICES; i++) {
		sas_dev = &hisi_hba->devices[i];
		device = sas_dev->sas_device;

		if ((sas_dev->dev_type == SAS_PHY_UNUSED) || !device)
			continue;

		hisi_sas_init_device(device);
	}
}

static void hisi_sas_send_ata_reset_each_phy(struct hisi_hba *hisi_hba,
					     struct asd_sas_port *sas_port,
					     struct domain_device *device)
{
	struct ata_port *ap = device->sata_dev.ap;
	struct device *dev = hisi_hba->dev;
	int rc = TMF_RESP_FUNC_FAILED;
	struct ata_link *link;
	u8 fis[20] = {0};
	int i;

	for (i = 0; i < hisi_hba->n_phy; i++) {
		if (!(sas_port->phy_mask & BIT(i)))
			continue;

		ata_for_each_link(link, ap, EDGE) {
			int pmp = sata_srst_pmp(link);

			hisi_sas_fill_ata_reset_cmd(link->device, 1, pmp, fis);
			rc = sas_execute_ata_cmd(device, fis, i);
			if (rc != TMF_RESP_FUNC_COMPLETE) {
				dev_err(dev, "phy%d ata reset failed rc=%d\n",
					i, rc);
				break;
			}
		}
	}
}

static void hisi_sas_terminate_stp_reject(struct hisi_hba *hisi_hba)
{
	struct device *dev = hisi_hba->dev;
	int port_no, rc, i;

	for (i = 0; i < HISI_SAS_MAX_DEVICES; i++) {
		struct hisi_sas_device *sas_dev = &hisi_hba->devices[i];
		struct domain_device *device = sas_dev->sas_device;

		if ((sas_dev->dev_type == SAS_PHY_UNUSED) || !device)
			continue;

		rc = hisi_sas_internal_task_abort_dev(sas_dev, false);
		if (rc < 0)
			dev_err(dev, "STP reject: abort dev failed %d\n", rc);
	}

	for (port_no = 0; port_no < hisi_hba->n_phy; port_no++) {
		struct hisi_sas_port *port = &hisi_hba->port[port_no];
		struct asd_sas_port *sas_port = &port->sas_port;
		struct domain_device *port_dev = sas_port->port_dev;
		struct domain_device *device;

		if (!port_dev || !dev_is_expander(port_dev->dev_type))
			continue;

		/* Try to find a SATA device */
		list_for_each_entry(device, &sas_port->dev_list,
				    dev_list_node) {
			if (dev_is_sata(device)) {
				hisi_sas_send_ata_reset_each_phy(hisi_hba,
								 sas_port,
								 device);
				break;
			}
		}
	}
}

void hisi_sas_controller_reset_prepare(struct hisi_hba *hisi_hba)
{
	struct Scsi_Host *shost = hisi_hba->shost;

	hisi_hba->phy_state = hisi_hba->hw->get_phys_state(hisi_hba);

	scsi_block_requests(shost);
	hisi_hba->hw->wait_cmds_complete_timeout(hisi_hba, 100, 5000);

	del_timer_sync(&hisi_hba->timer);

	set_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
}
EXPORT_SYMBOL_GPL(hisi_sas_controller_reset_prepare);

void hisi_sas_controller_reset_done(struct hisi_hba *hisi_hba)
{
	struct Scsi_Host *shost = hisi_hba->shost;

	/* Init and wait for PHYs to come up and all libsas event finished. */
	hisi_hba->hw->phys_init(hisi_hba);
	msleep(1000);
	hisi_sas_refresh_port_id(hisi_hba);
	clear_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);

	if (hisi_hba->reject_stp_links_msk)
		hisi_sas_terminate_stp_reject(hisi_hba);
	hisi_sas_reset_init_all_devices(hisi_hba);
	scsi_unblock_requests(shost);
	clear_bit(HISI_SAS_RESETTING_BIT, &hisi_hba->flags);
	up(&hisi_hba->sem);

	hisi_sas_rescan_topology(hisi_hba, hisi_hba->phy_state);
}
EXPORT_SYMBOL_GPL(hisi_sas_controller_reset_done);

static int hisi_sas_controller_prereset(struct hisi_hba *hisi_hba)
{
	if (!hisi_hba->hw->soft_reset)
		return -1;

	down(&hisi_hba->sem);
	if (test_and_set_bit(HISI_SAS_RESETTING_BIT, &hisi_hba->flags)) {
		up(&hisi_hba->sem);
		return -1;
	}

	if (hisi_sas_debugfs_enable && hisi_hba->debugfs_itct[0].itct)
		hisi_hba->hw->debugfs_snapshot_regs(hisi_hba);

	return 0;
}

static int hisi_sas_controller_reset(struct hisi_hba *hisi_hba)
{
	struct device *dev = hisi_hba->dev;
	struct Scsi_Host *shost = hisi_hba->shost;
	int rc;

	dev_info(dev, "controller resetting...\n");
	hisi_sas_controller_reset_prepare(hisi_hba);

	rc = hisi_hba->hw->soft_reset(hisi_hba);
	if (rc) {
		dev_warn(dev, "controller reset failed (%d)\n", rc);
		clear_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags);
		up(&hisi_hba->sem);
		scsi_unblock_requests(shost);
		clear_bit(HISI_SAS_RESETTING_BIT, &hisi_hba->flags);
		return rc;
	}
	clear_bit(HISI_SAS_HW_FAULT_BIT, &hisi_hba->flags);

	hisi_sas_controller_reset_done(hisi_hba);
	dev_info(dev, "controller reset complete\n");

	return 0;
}

static int hisi_sas_abort_task(struct sas_task *task)
{
	struct hisi_sas_internal_abort_data internal_abort_data = { false };
	struct domain_device *device = task->dev;
	struct hisi_sas_device *sas_dev = device->lldd_dev;
	struct hisi_hba *hisi_hba;
	struct device *dev;
	int rc = TMF_RESP_FUNC_FAILED;
	unsigned long flags;

	if (!sas_dev)
		return TMF_RESP_FUNC_FAILED;

	hisi_hba = dev_to_hisi_hba(task->dev);
	dev = hisi_hba->dev;

	spin_lock_irqsave(&task->task_state_lock, flags);
	if (task->task_state_flags & SAS_TASK_STATE_DONE) {
		struct hisi_sas_slot *slot = task->lldd_task;
		struct hisi_sas_cq *cq;

		if (slot) {
			/*
			 * sync irq to avoid free'ing task
			 * before using task in IO completion
			 */
			cq = &hisi_hba->cq[slot->dlvry_queue];
			synchronize_irq(cq->irq_no);
		}
		spin_unlock_irqrestore(&task->task_state_lock, flags);
		rc = TMF_RESP_FUNC_COMPLETE;
		goto out;
	}
	task->task_state_flags |= SAS_TASK_STATE_ABORTED;
	spin_unlock_irqrestore(&task->task_state_lock, flags);

	if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SSP) {
		struct hisi_sas_slot *slot = task->lldd_task;
		u16 tag = slot->idx;
		int rc2;

		rc = sas_abort_task(task, tag);
		rc2 = sas_execute_internal_abort_single(device, tag,
				slot->dlvry_queue, &internal_abort_data);
		if (rc2 < 0) {
			dev_err(dev, "abort task: internal abort (%d)\n", rc2);
			return TMF_RESP_FUNC_FAILED;
		}

		/*
		 * If the TMF finds that the IO is not in the device and also
		 * the internal abort does not succeed, then it is safe to
		 * free the slot.
		 * Note: if the internal abort succeeds then the slot
		 * will have already been completed
		 */
		if (rc == TMF_RESP_FUNC_COMPLETE && rc2 != TMF_RESP_FUNC_SUCC) {
			if (task->lldd_task)
				hisi_sas_do_release_task(hisi_hba, task, slot);
		}
	} else if (task->task_proto & SAS_PROTOCOL_SATA ||
		task->task_proto & SAS_PROTOCOL_STP) {
		if (task->dev->dev_type == SAS_SATA_DEV) {
			rc = hisi_sas_internal_task_abort_dev(sas_dev, false);
			if (rc < 0) {
				dev_err(dev, "abort task: internal abort failed\n");
				goto out;
			}
			hisi_sas_dereg_device(hisi_hba, device);
			rc = hisi_sas_softreset_ata_disk(device);
		}
	} else if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SMP) {
		/* SMP */
		struct hisi_sas_slot *slot = task->lldd_task;
		u32 tag = slot->idx;
		struct hisi_sas_cq *cq = &hisi_hba->cq[slot->dlvry_queue];

		rc = sas_execute_internal_abort_single(device,
						       tag, slot->dlvry_queue,
						       &internal_abort_data);
		if (((rc < 0) || (rc == TMF_RESP_FUNC_FAILED)) &&
					task->lldd_task) {
			/*
			 * sync irq to avoid free'ing task
			 * before using task in IO completion
			 */
			synchronize_irq(cq->irq_no);
			slot->task = NULL;
		}
	}

out:
	if (rc != TMF_RESP_FUNC_COMPLETE)
		dev_notice(dev, "abort task: rc=%d\n", rc);
	return rc;
}

static int hisi_sas_abort_task_set(struct domain_device *device, u8 *lun)
{
	struct hisi_sas_device *sas_dev = device->lldd_dev;
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
	struct device *dev = hisi_hba->dev;
	int rc;

	rc = hisi_sas_internal_task_abort_dev(sas_dev, false);
	if (rc < 0) {
		dev_err(dev, "abort task set: internal abort rc=%d\n", rc);
		return TMF_RESP_FUNC_FAILED;
	}
	hisi_sas_dereg_device(hisi_hba, device);

	rc = sas_abort_task_set(device, lun);
	if (rc == TMF_RESP_FUNC_COMPLETE)
		hisi_sas_release_task(hisi_hba, device);

	return rc;
}

static int hisi_sas_debug_I_T_nexus_reset(struct domain_device *device)
{
	struct sas_phy *local_phy = sas_get_local_phy(device);
	struct hisi_sas_device *sas_dev = device->lldd_dev;
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
	struct sas_ha_struct *sas_ha = &hisi_hba->sha;
	int rc, reset_type;

	if (!local_phy->enabled) {
		sas_put_local_phy(local_phy);
		return -ENODEV;
	}

	if (scsi_is_sas_phy_local(local_phy)) {
		struct asd_sas_phy *sas_phy =
			sas_ha->sas_phy[local_phy->number];
		struct hisi_sas_phy *phy =
			container_of(sas_phy, struct hisi_sas_phy, sas_phy);
		unsigned long flags;

		spin_lock_irqsave(&phy->lock, flags);
		phy->in_reset = 1;
		spin_unlock_irqrestore(&phy->lock, flags);
	}

	reset_type = (sas_dev->dev_status == HISI_SAS_DEV_INIT ||
		      !dev_is_sata(device)) ? true : false;

	rc = sas_phy_reset(local_phy, reset_type);
	sas_put_local_phy(local_phy);

	if (scsi_is_sas_phy_local(local_phy)) {
		struct asd_sas_phy *sas_phy =
			sas_ha->sas_phy[local_phy->number];
		struct hisi_sas_phy *phy =
			container_of(sas_phy, struct hisi_sas_phy, sas_phy);
		unsigned long flags;

		spin_lock_irqsave(&phy->lock, flags);
		phy->in_reset = 0;
		spin_unlock_irqrestore(&phy->lock, flags);

		/* report PHY down if timed out */
		if (rc == -ETIMEDOUT)
			hisi_sas_phy_down(hisi_hba, sas_phy->id, 0, GFP_KERNEL);
		return rc;
	}

	if (rc)
		return rc;

	/* Remote phy */
	if (dev_is_sata(device)) {
		rc = sas_ata_wait_after_reset(device,
					HISI_SAS_WAIT_PHYUP_TIMEOUT);
	} else {
		msleep(2000);
	}

	return rc;
}

static int hisi_sas_I_T_nexus_reset(struct domain_device *device)
{
	struct hisi_sas_device *sas_dev = device->lldd_dev;
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
	struct device *dev = hisi_hba->dev;
	int rc;

	rc = hisi_sas_internal_task_abort_dev(sas_dev, false);
	if (rc < 0) {
		dev_err(dev, "I_T nexus reset: internal abort (%d)\n", rc);
		return TMF_RESP_FUNC_FAILED;
	}
	hisi_sas_dereg_device(hisi_hba, device);

	rc = hisi_sas_debug_I_T_nexus_reset(device);
	if (rc == TMF_RESP_FUNC_COMPLETE && dev_is_sata(device)) {
		struct sas_phy *local_phy;

		rc = hisi_sas_softreset_ata_disk(device);
		switch (rc) {
		case -ECOMM:
			rc = -ENODEV;
			break;
		case TMF_RESP_FUNC_FAILED:
		case -EMSGSIZE:
		case -EIO:
			local_phy = sas_get_local_phy(device);
			rc = sas_phy_enable(local_phy, 0);
			if (!rc) {
				local_phy->enabled = 0;
				dev_err(dev, "Disabled local phy of ATA disk %016llx due to softreset fail (%d)\n",
					SAS_ADDR(device->sas_addr), rc);
				rc = -ENODEV;
			}
			sas_put_local_phy(local_phy);
			break;
		default:
			break;
		}
	}

	if ((rc == TMF_RESP_FUNC_COMPLETE) || (rc == -ENODEV))
		hisi_sas_release_task(hisi_hba, device);

	return rc;
}

static int hisi_sas_lu_reset(struct domain_device *device, u8 *lun)
{
	struct hisi_sas_device *sas_dev = device->lldd_dev;
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
	struct device *dev = hisi_hba->dev;
	int rc = TMF_RESP_FUNC_FAILED;

	/* Clear internal IO and then lu reset */
	rc = hisi_sas_internal_task_abort_dev(sas_dev, false);
	if (rc < 0) {
		dev_err(dev, "lu_reset: internal abort failed\n");
		goto out;
	}
	hisi_sas_dereg_device(hisi_hba, device);

	if (dev_is_sata(device)) {
		struct sas_phy *phy;

		phy = sas_get_local_phy(device);

		rc = sas_phy_reset(phy, true);

		if (rc == 0)
			hisi_sas_release_task(hisi_hba, device);
		sas_put_local_phy(phy);
	} else {
		rc = sas_lu_reset(device, lun);
		if (rc == TMF_RESP_FUNC_COMPLETE)
			hisi_sas_release_task(hisi_hba, device);
	}
out:
	if (rc != TMF_RESP_FUNC_COMPLETE)
		dev_err(dev, "lu_reset: for device[%d]:rc= %d\n",
			     sas_dev->device_id, rc);
	return rc;
}

static void hisi_sas_async_I_T_nexus_reset(void *data, async_cookie_t cookie)
{
	struct domain_device *device = data;
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
	int rc;

	rc = hisi_sas_debug_I_T_nexus_reset(device);
	if (rc != TMF_RESP_FUNC_COMPLETE)
		dev_info(hisi_hba->dev, "I_T_nexus reset fail for dev:%016llx rc=%d\n",
			 SAS_ADDR(device->sas_addr), rc);
}

static int hisi_sas_clear_nexus_ha(struct sas_ha_struct *sas_ha)
{
	struct hisi_hba *hisi_hba = sas_ha->lldd_ha;
	HISI_SAS_DECLARE_RST_WORK_ON_STACK(r);
	ASYNC_DOMAIN_EXCLUSIVE(async);
	int i, ret;

	queue_work(hisi_hba->wq, &r.work);
	wait_for_completion(r.completion);
	if (!r.done) {
		ret = TMF_RESP_FUNC_FAILED;
		goto out;
	}

	for (i = 0; i < HISI_SAS_MAX_DEVICES; i++) {
		struct hisi_sas_device *sas_dev = &hisi_hba->devices[i];
		struct domain_device *device = sas_dev->sas_device;

		if ((sas_dev->dev_type == SAS_PHY_UNUSED) || !device ||
		    dev_is_expander(device->dev_type))
			continue;

		async_schedule_domain(hisi_sas_async_I_T_nexus_reset,
				      device, &async);
	}

	async_synchronize_full_domain(&async);
	hisi_sas_release_tasks(hisi_hba);

	ret = TMF_RESP_FUNC_COMPLETE;
out:
	return ret;
}

static int hisi_sas_query_task(struct sas_task *task)
{
	int rc = TMF_RESP_FUNC_FAILED;

	if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SSP) {
		struct hisi_sas_slot *slot = task->lldd_task;
		u32 tag = slot->idx;

		rc = sas_query_task(task, tag);
		switch (rc) {
		/* The task is still in Lun, release it then */
		case TMF_RESP_FUNC_SUCC:
		/* The task is not in Lun or failed, reset the phy */
		case TMF_RESP_FUNC_FAILED:
		case TMF_RESP_FUNC_COMPLETE:
			break;
		default:
			rc = TMF_RESP_FUNC_FAILED;
			break;
		}
	}
	return rc;
}

static bool hisi_sas_internal_abort_timeout(struct sas_task *task,
					    void *data)
{
	struct domain_device *device = task->dev;
	struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
	struct hisi_sas_internal_abort_data *timeout = data;

	if (hisi_sas_debugfs_enable && hisi_hba->debugfs_itct[0].itct)
		queue_work(hisi_hba->wq, &hisi_hba->debugfs_work);

	if (task->task_state_flags & SAS_TASK_STATE_DONE) {
		pr_err("Internal abort: timeout %016llx\n",
		       SAS_ADDR(device->sas_addr));
	} else {
		struct hisi_sas_slot *slot = task->lldd_task;

		set_bit(HISI_SAS_HW_FAULT_BIT, &hisi_hba->flags);

		if (slot) {
			struct hisi_sas_cq *cq =
				&hisi_hba->cq[slot->dlvry_queue];
			/*
			 * sync irq to avoid free'ing task
			 * before using task in IO completion
			 */
			synchronize_irq(cq->irq_no);
			slot->task = NULL;
		}

		if (timeout->rst_ha_timeout) {
			pr_err("Internal abort: timeout and not done %016llx. Queuing reset.\n",
			       SAS_ADDR(device->sas_addr));
			queue_work(hisi_hba->wq, &hisi_hba->rst_work);
		} else {
			pr_err("Internal abort: timeout and not done %016llx.\n",
			       SAS_ADDR(device->sas_addr));
		}

		return true;
	}

	return false;
}

static void hisi_sas_port_formed(struct asd_sas_phy *sas_phy)
{
	hisi_sas_port_notify_formed(sas_phy);
}

static int hisi_sas_write_gpio(struct sas_ha_struct *sha, u8 reg_type,
			u8 reg_index, u8 reg_count, u8 *write_data)
{
	struct hisi_hba *hisi_hba = sha->lldd_ha;

	if (!hisi_hba->hw->write_gpio)
		return -EOPNOTSUPP;

	return hisi_hba->hw->write_gpio(hisi_hba, reg_type,
				reg_index, reg_count, write_data);
}

static void hisi_sas_phy_disconnected(struct hisi_sas_phy *phy)
{
	struct asd_sas_phy *sas_phy = &phy->sas_phy;
	struct sas_phy *sphy = sas_phy->phy;
	unsigned long flags;

	phy->phy_attached = 0;
	phy->phy_type = 0;
	phy->port = NULL;

	spin_lock_irqsave(&phy->lock, flags);
	if (phy->enable)
		sphy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
	else
		sphy->negotiated_linkrate = SAS_PHY_DISABLED;
	spin_unlock_irqrestore(&phy->lock, flags);
}

void hisi_sas_phy_down(struct hisi_hba *hisi_hba, int phy_no, int rdy,
		       gfp_t gfp_flags)
{
	struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
	struct asd_sas_phy *sas_phy = &phy->sas_phy;
	struct device *dev = hisi_hba->dev;

	if (rdy) {
		/* Phy down but ready */
		hisi_sas_bytes_dmaed(hisi_hba, phy_no, gfp_flags);
		hisi_sas_port_notify_formed(sas_phy);
	} else {
		struct hisi_sas_port *port  = phy->port;

		if (test_bit(HISI_SAS_RESETTING_BIT, &hisi_hba->flags) ||
		    phy->in_reset) {
			dev_info(dev, "ignore flutter phy%d down\n", phy_no);
			return;
		}
		/* Phy down and not ready */
		sas_notify_phy_event(sas_phy, PHYE_LOSS_OF_SIGNAL, gfp_flags);
		sas_phy_disconnected(sas_phy);

		if (port) {
			if (phy->phy_type & PORT_TYPE_SAS) {
				int port_id = port->id;

				if (!hisi_hba->hw->get_wideport_bitmap(hisi_hba,
								       port_id))
					port->port_attached = 0;
			} else if (phy->phy_type & PORT_TYPE_SATA)
				port->port_attached = 0;
		}
		hisi_sas_phy_disconnected(phy);
	}
}
EXPORT_SYMBOL_GPL(hisi_sas_phy_down);

void hisi_sas_phy_bcast(struct hisi_sas_phy *phy)
{
	struct asd_sas_phy *sas_phy = &phy->sas_phy;
	struct hisi_hba	*hisi_hba = phy->hisi_hba;
	struct sas_ha_struct *sha = &hisi_hba->sha;

	if (test_bit(HISI_SAS_RESETTING_BIT, &hisi_hba->flags))
		return;

	if (test_bit(SAS_HA_FROZEN, &sha->state))
		return;

	sas_notify_port_event(sas_phy, PORTE_BROADCAST_RCVD, GFP_ATOMIC);
}
EXPORT_SYMBOL_GPL(hisi_sas_phy_bcast);

void hisi_sas_sync_irqs(struct hisi_hba *hisi_hba)
{
	int i;

	for (i = 0; i < hisi_hba->cq_nvecs; i++) {
		struct hisi_sas_cq *cq = &hisi_hba->cq[i];

		synchronize_irq(cq->irq_no);
	}
}
EXPORT_SYMBOL_GPL(hisi_sas_sync_irqs);

int hisi_sas_host_reset(struct Scsi_Host *shost, int reset_type)
{
	struct hisi_hba *hisi_hba = shost_priv(shost);

	if (reset_type != SCSI_ADAPTER_RESET)
		return -EOPNOTSUPP;

	queue_work(hisi_hba->wq, &hisi_hba->rst_work);

	return 0;
}
EXPORT_SYMBOL_GPL(hisi_sas_host_reset);

struct scsi_transport_template *hisi_sas_stt;
EXPORT_SYMBOL_GPL(hisi_sas_stt);

static struct sas_domain_function_template hisi_sas_transport_ops = {
	.lldd_dev_found		= hisi_sas_dev_found,
	.lldd_dev_gone		= hisi_sas_dev_gone,
	.lldd_execute_task	= hisi_sas_queue_command,
	.lldd_control_phy	= hisi_sas_control_phy,
	.lldd_abort_task	= hisi_sas_abort_task,
	.lldd_abort_task_set	= hisi_sas_abort_task_set,
	.lldd_I_T_nexus_reset	= hisi_sas_I_T_nexus_reset,
	.lldd_lu_reset		= hisi_sas_lu_reset,
	.lldd_query_task	= hisi_sas_query_task,
	.lldd_clear_nexus_ha	= hisi_sas_clear_nexus_ha,
	.lldd_port_formed	= hisi_sas_port_formed,
	.lldd_write_gpio	= hisi_sas_write_gpio,
	.lldd_tmf_aborted	= hisi_sas_tmf_aborted,
	.lldd_abort_timeout	= hisi_sas_internal_abort_timeout,
};

void hisi_sas_init_mem(struct hisi_hba *hisi_hba)
{
	int i, s, j, max_command_entries = HISI_SAS_MAX_COMMANDS;
	struct hisi_sas_breakpoint *sata_breakpoint = hisi_hba->sata_breakpoint;

	for (i = 0; i < hisi_hba->queue_count; i++) {
		struct hisi_sas_cq *cq = &hisi_hba->cq[i];
		struct hisi_sas_dq *dq = &hisi_hba->dq[i];
		struct hisi_sas_cmd_hdr *cmd_hdr = hisi_hba->cmd_hdr[i];

		s = sizeof(struct hisi_sas_cmd_hdr);
		for (j = 0; j < HISI_SAS_QUEUE_SLOTS; j++)
			memset(&cmd_hdr[j], 0, s);

		dq->wr_point = 0;

		s = hisi_hba->hw->complete_hdr_size * HISI_SAS_QUEUE_SLOTS;
		memset(hisi_hba->complete_hdr[i], 0, s);
		cq->rd_point = 0;
	}

	s = sizeof(struct hisi_sas_initial_fis) * hisi_hba->n_phy;
	memset(hisi_hba->initial_fis, 0, s);

	s = max_command_entries * sizeof(struct hisi_sas_iost);
	memset(hisi_hba->iost, 0, s);

	s = max_command_entries * sizeof(struct hisi_sas_breakpoint);
	memset(hisi_hba->breakpoint, 0, s);

	s = sizeof(struct hisi_sas_sata_breakpoint);
	for (j = 0; j < HISI_SAS_MAX_ITCT_ENTRIES; j++)
		memset(&sata_breakpoint[j], 0, s);
}
EXPORT_SYMBOL_GPL(hisi_sas_init_mem);

int hisi_sas_alloc(struct hisi_hba *hisi_hba)
{
	struct device *dev = hisi_hba->dev;
	int i, j, s, max_command_entries = HISI_SAS_MAX_COMMANDS;
	int max_command_entries_ru, sz_slot_buf_ru;
	int blk_cnt, slots_per_blk;

	sema_init(&hisi_hba->sem, 1);
	spin_lock_init(&hisi_hba->lock);
	for (i = 0; i < hisi_hba->n_phy; i++) {
		hisi_sas_phy_init(hisi_hba, i);
		hisi_hba->port[i].port_attached = 0;
		hisi_hba->port[i].id = -1;
	}

	for (i = 0; i < HISI_SAS_MAX_DEVICES; i++) {
		hisi_hba->devices[i].dev_type = SAS_PHY_UNUSED;
		hisi_hba->devices[i].device_id = i;
		hisi_hba->devices[i].dev_status = HISI_SAS_DEV_INIT;
	}

	for (i = 0; i < hisi_hba->queue_count; i++) {
		struct hisi_sas_cq *cq = &hisi_hba->cq[i];
		struct hisi_sas_dq *dq = &hisi_hba->dq[i];

		/* Completion queue structure */
		cq->id = i;
		cq->hisi_hba = hisi_hba;

		/* Delivery queue structure */
		spin_lock_init(&dq->lock);
		INIT_LIST_HEAD(&dq->list);
		dq->id = i;
		dq->hisi_hba = hisi_hba;

		/* Delivery queue */
		s = sizeof(struct hisi_sas_cmd_hdr) * HISI_SAS_QUEUE_SLOTS;
		hisi_hba->cmd_hdr[i] = dmam_alloc_coherent(dev, s,
						&hisi_hba->cmd_hdr_dma[i],
						GFP_KERNEL);
		if (!hisi_hba->cmd_hdr[i])
			goto err_out;

		/* Completion queue */
		s = hisi_hba->hw->complete_hdr_size * HISI_SAS_QUEUE_SLOTS;
		hisi_hba->complete_hdr[i] = dmam_alloc_coherent(dev, s,
						&hisi_hba->complete_hdr_dma[i],
						GFP_KERNEL);
		if (!hisi_hba->complete_hdr[i])
			goto err_out;
	}

	s = HISI_SAS_MAX_ITCT_ENTRIES * sizeof(struct hisi_sas_itct);
	hisi_hba->itct = dmam_alloc_coherent(dev, s, &hisi_hba->itct_dma,
					     GFP_KERNEL);
	if (!hisi_hba->itct)
		goto err_out;

	hisi_hba->slot_info = devm_kcalloc(dev, max_command_entries,
					   sizeof(struct hisi_sas_slot),
					   GFP_KERNEL);
	if (!hisi_hba->slot_info)
		goto err_out;

	/* roundup to avoid overly large block size */
	max_command_entries_ru = roundup(max_command_entries, 64);
	if (hisi_hba->prot_mask & HISI_SAS_DIX_PROT_MASK)
		sz_slot_buf_ru = sizeof(struct hisi_sas_slot_dif_buf_table);
	else
		sz_slot_buf_ru = sizeof(struct hisi_sas_slot_buf_table);
	sz_slot_buf_ru = roundup(sz_slot_buf_ru, 64);
	s = max(lcm(max_command_entries_ru, sz_slot_buf_ru), PAGE_SIZE);
	blk_cnt = (max_command_entries_ru * sz_slot_buf_ru) / s;
	slots_per_blk = s / sz_slot_buf_ru;

	for (i = 0; i < blk_cnt; i++) {
		int slot_index = i * slots_per_blk;
		dma_addr_t buf_dma;
		void *buf;

		buf = dmam_alloc_coherent(dev, s, &buf_dma,
					  GFP_KERNEL);
		if (!buf)
			goto err_out;

		for (j = 0; j < slots_per_blk; j++, slot_index++) {
			struct hisi_sas_slot *slot;

			slot = &hisi_hba->slot_info[slot_index];
			slot->buf = buf;
			slot->buf_dma = buf_dma;
			slot->idx = slot_index;

			buf += sz_slot_buf_ru;
			buf_dma += sz_slot_buf_ru;
		}
	}

	s = max_command_entries * sizeof(struct hisi_sas_iost);
	hisi_hba->iost = dmam_alloc_coherent(dev, s, &hisi_hba->iost_dma,
					     GFP_KERNEL);
	if (!hisi_hba->iost)
		goto err_out;

	s = max_command_entries * sizeof(struct hisi_sas_breakpoint);
	hisi_hba->breakpoint = dmam_alloc_coherent(dev, s,
						   &hisi_hba->breakpoint_dma,
						   GFP_KERNEL);
	if (!hisi_hba->breakpoint)
		goto err_out;

	s = hisi_hba->slot_index_count = max_command_entries;
	hisi_hba->slot_index_tags = devm_bitmap_zalloc(dev, s, GFP_KERNEL);
	if (!hisi_hba->slot_index_tags)
		goto err_out;

	s = sizeof(struct hisi_sas_initial_fis) * HISI_SAS_MAX_PHYS;
	hisi_hba->initial_fis = dmam_alloc_coherent(dev, s,
						    &hisi_hba->initial_fis_dma,
						    GFP_KERNEL);
	if (!hisi_hba->initial_fis)
		goto err_out;

	s = HISI_SAS_MAX_ITCT_ENTRIES * sizeof(struct hisi_sas_sata_breakpoint);
	hisi_hba->sata_breakpoint = dmam_alloc_coherent(dev, s,
					&hisi_hba->sata_breakpoint_dma,
					GFP_KERNEL);
	if (!hisi_hba->sata_breakpoint)
		goto err_out;

	hisi_hba->last_slot_index = HISI_SAS_UNRESERVED_IPTT;

	hisi_hba->wq = create_singlethread_workqueue(dev_name(dev));
	if (!hisi_hba->wq) {
		dev_err(dev, "sas_alloc: failed to create workqueue\n");
		goto err_out;
	}

	return 0;
err_out:
	return -ENOMEM;
}
EXPORT_SYMBOL_GPL(hisi_sas_alloc);

void hisi_sas_free(struct hisi_hba *hisi_hba)
{
	int i;

	for (i = 0; i < hisi_hba->n_phy; i++) {
		struct hisi_sas_phy *phy = &hisi_hba->phy[i];

		del_timer_sync(&phy->timer);
	}

	if (hisi_hba->wq)
		destroy_workqueue(hisi_hba->wq);
}
EXPORT_SYMBOL_GPL(hisi_sas_free);

void hisi_sas_rst_work_handler(struct work_struct *work)
{
	struct hisi_hba *hisi_hba =
		container_of(work, struct hisi_hba, rst_work);

	if (hisi_sas_controller_prereset(hisi_hba))
		return;

	hisi_sas_controller_reset(hisi_hba);
}
EXPORT_SYMBOL_GPL(hisi_sas_rst_work_handler);

void hisi_sas_sync_rst_work_handler(struct work_struct *work)
{
	struct hisi_sas_rst *rst =
		container_of(work, struct hisi_sas_rst, work);

	if (hisi_sas_controller_prereset(rst->hisi_hba))
		goto rst_complete;

	if (!hisi_sas_controller_reset(rst->hisi_hba))
		rst->done = true;
rst_complete:
	complete(rst->completion);
}
EXPORT_SYMBOL_GPL(hisi_sas_sync_rst_work_handler);

int hisi_sas_get_fw_info(struct hisi_hba *hisi_hba)
{
	struct device *dev = hisi_hba->dev;
	struct platform_device *pdev = hisi_hba->platform_dev;
	struct device_node *np = pdev ? pdev->dev.of_node : NULL;
	struct clk *refclk;

	if (device_property_read_u8_array(dev, "sas-addr", hisi_hba->sas_addr,
					  SAS_ADDR_SIZE)) {
		dev_err(dev, "could not get property sas-addr\n");
		return -ENOENT;
	}

	if (np) {
		/*
		 * These properties are only required for platform device-based
		 * controller with DT firmware.
		 */
		hisi_hba->ctrl = syscon_regmap_lookup_by_phandle(np,
					"hisilicon,sas-syscon");
		if (IS_ERR(hisi_hba->ctrl)) {
			dev_err(dev, "could not get syscon\n");
			return -ENOENT;
		}

		if (device_property_read_u32(dev, "ctrl-reset-reg",
					     &hisi_hba->ctrl_reset_reg)) {
			dev_err(dev, "could not get property ctrl-reset-reg\n");
			return -ENOENT;
		}

		if (device_property_read_u32(dev, "ctrl-reset-sts-reg",
					     &hisi_hba->ctrl_reset_sts_reg)) {
			dev_err(dev, "could not get property ctrl-reset-sts-reg\n");
			return -ENOENT;
		}

		if (device_property_read_u32(dev, "ctrl-clock-ena-reg",
					     &hisi_hba->ctrl_clock_ena_reg)) {
			dev_err(dev, "could not get property ctrl-clock-ena-reg\n");
			return -ENOENT;
		}
	}

	refclk = devm_clk_get(dev, NULL);
	if (IS_ERR(refclk))
		dev_dbg(dev, "no ref clk property\n");
	else
		hisi_hba->refclk_frequency_mhz = clk_get_rate(refclk) / 1000000;

	if (device_property_read_u32(dev, "phy-count", &hisi_hba->n_phy)) {
		dev_err(dev, "could not get property phy-count\n");
		return -ENOENT;
	}

	if (device_property_read_u32(dev, "queue-count",
				     &hisi_hba->queue_count)) {
		dev_err(dev, "could not get property queue-count\n");
		return -ENOENT;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(hisi_sas_get_fw_info);

static struct Scsi_Host *hisi_sas_shost_alloc(struct platform_device *pdev,
					      const struct hisi_sas_hw *hw)
{
	struct resource *res;
	struct Scsi_Host *shost;
	struct hisi_hba *hisi_hba;
	struct device *dev = &pdev->dev;
	int error;

	shost = scsi_host_alloc(hw->sht, sizeof(*hisi_hba));
	if (!shost) {
		dev_err(dev, "scsi host alloc failed\n");
		return NULL;
	}
	hisi_hba = shost_priv(shost);

	INIT_WORK(&hisi_hba->rst_work, hisi_sas_rst_work_handler);
	hisi_hba->hw = hw;
	hisi_hba->dev = dev;
	hisi_hba->platform_dev = pdev;
	hisi_hba->shost = shost;
	SHOST_TO_SAS_HA(shost) = &hisi_hba->sha;

	timer_setup(&hisi_hba->timer, NULL, 0);

	if (hisi_sas_get_fw_info(hisi_hba) < 0)
		goto err_out;

	error = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
	if (error) {
		dev_err(dev, "No usable DMA addressing method\n");
		goto err_out;
	}

	hisi_hba->regs = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(hisi_hba->regs))
		goto err_out;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	if (res) {
		hisi_hba->sgpio_regs = devm_ioremap_resource(dev, res);
		if (IS_ERR(hisi_hba->sgpio_regs))
			goto err_out;
	}

	if (hisi_sas_alloc(hisi_hba)) {
		hisi_sas_free(hisi_hba);
		goto err_out;
	}

	return shost;
err_out:
	scsi_host_put(shost);
	dev_err(dev, "shost alloc failed\n");
	return NULL;
}

static int hisi_sas_interrupt_preinit(struct hisi_hba *hisi_hba)
{
	if (hisi_hba->hw->interrupt_preinit)
		return hisi_hba->hw->interrupt_preinit(hisi_hba);
	return 0;
}

int hisi_sas_probe(struct platform_device *pdev,
		   const struct hisi_sas_hw *hw)
{
	struct Scsi_Host *shost;
	struct hisi_hba *hisi_hba;
	struct device *dev = &pdev->dev;
	struct asd_sas_phy **arr_phy;
	struct asd_sas_port **arr_port;
	struct sas_ha_struct *sha;
	int rc, phy_nr, port_nr, i;

	shost = hisi_sas_shost_alloc(pdev, hw);
	if (!shost)
		return -ENOMEM;

	sha = SHOST_TO_SAS_HA(shost);
	hisi_hba = shost_priv(shost);
	platform_set_drvdata(pdev, sha);

	phy_nr = port_nr = hisi_hba->n_phy;

	arr_phy = devm_kcalloc(dev, phy_nr, sizeof(void *), GFP_KERNEL);
	arr_port = devm_kcalloc(dev, port_nr, sizeof(void *), GFP_KERNEL);
	if (!arr_phy || !arr_port) {
		rc = -ENOMEM;
		goto err_out_ha;
	}

	sha->sas_phy = arr_phy;
	sha->sas_port = arr_port;
	sha->lldd_ha = hisi_hba;

	shost->transportt = hisi_sas_stt;
	shost->max_id = HISI_SAS_MAX_DEVICES;
	shost->max_lun = ~0;
	shost->max_channel = 1;
	shost->max_cmd_len = 16;
	if (hisi_hba->hw->slot_index_alloc) {
		shost->can_queue = HISI_SAS_MAX_COMMANDS;
		shost->cmd_per_lun = HISI_SAS_MAX_COMMANDS;
	} else {
		shost->can_queue = HISI_SAS_UNRESERVED_IPTT;
		shost->cmd_per_lun = HISI_SAS_UNRESERVED_IPTT;
	}

	sha->sas_ha_name = DRV_NAME;
	sha->dev = hisi_hba->dev;
	sha->lldd_module = THIS_MODULE;
	sha->sas_addr = &hisi_hba->sas_addr[0];
	sha->num_phys = hisi_hba->n_phy;
	sha->core.shost = hisi_hba->shost;

	for (i = 0; i < hisi_hba->n_phy; i++) {
		sha->sas_phy[i] = &hisi_hba->phy[i].sas_phy;
		sha->sas_port[i] = &hisi_hba->port[i].sas_port;
	}

	rc = hisi_sas_interrupt_preinit(hisi_hba);
	if (rc)
		goto err_out_ha;

	rc = scsi_add_host(shost, &pdev->dev);
	if (rc)
		goto err_out_ha;

	rc = sas_register_ha(sha);
	if (rc)
		goto err_out_register_ha;

	rc = hisi_hba->hw->hw_init(hisi_hba);
	if (rc)
		goto err_out_hw_init;

	scsi_scan_host(shost);

	return 0;

err_out_hw_init:
	sas_unregister_ha(sha);
err_out_register_ha:
	scsi_remove_host(shost);
err_out_ha:
	hisi_sas_free(hisi_hba);
	scsi_host_put(shost);
	return rc;
}
EXPORT_SYMBOL_GPL(hisi_sas_probe);

int hisi_sas_remove(struct platform_device *pdev)
{
	struct sas_ha_struct *sha = platform_get_drvdata(pdev);
	struct hisi_hba *hisi_hba = sha->lldd_ha;
	struct Scsi_Host *shost = sha->core.shost;

	del_timer_sync(&hisi_hba->timer);

	sas_unregister_ha(sha);
	sas_remove_host(sha->core.shost);

	hisi_sas_free(hisi_hba);
	scsi_host_put(shost);
	return 0;
}
EXPORT_SYMBOL_GPL(hisi_sas_remove);

#if IS_ENABLED(CONFIG_SCSI_HISI_SAS_DEBUGFS_DEFAULT_ENABLE)
#define DEBUGFS_ENABLE_DEFAULT  "enabled"
bool hisi_sas_debugfs_enable = true;
u32 hisi_sas_debugfs_dump_count = 50;
#else
#define DEBUGFS_ENABLE_DEFAULT "disabled"
bool hisi_sas_debugfs_enable;
u32 hisi_sas_debugfs_dump_count = 1;
#endif

EXPORT_SYMBOL_GPL(hisi_sas_debugfs_enable);
module_param_named(debugfs_enable, hisi_sas_debugfs_enable, bool, 0444);
MODULE_PARM_DESC(hisi_sas_debugfs_enable,
		 "Enable driver debugfs (default "DEBUGFS_ENABLE_DEFAULT")");

EXPORT_SYMBOL_GPL(hisi_sas_debugfs_dump_count);
module_param_named(debugfs_dump_count, hisi_sas_debugfs_dump_count, uint, 0444);
MODULE_PARM_DESC(hisi_sas_debugfs_dump_count, "Number of debugfs dumps to allow");

struct dentry *hisi_sas_debugfs_dir;
EXPORT_SYMBOL_GPL(hisi_sas_debugfs_dir);

static __init int hisi_sas_init(void)
{
	hisi_sas_stt = sas_domain_attach_transport(&hisi_sas_transport_ops);
	if (!hisi_sas_stt)
		return -ENOMEM;

	if (hisi_sas_debugfs_enable) {
		hisi_sas_debugfs_dir = debugfs_create_dir("hisi_sas", NULL);
		if (hisi_sas_debugfs_dump_count > HISI_SAS_MAX_DEBUGFS_DUMP) {
			pr_info("hisi_sas: Limiting debugfs dump count\n");
			hisi_sas_debugfs_dump_count = HISI_SAS_MAX_DEBUGFS_DUMP;
		}
	}

	return 0;
}

static __exit void hisi_sas_exit(void)
{
	sas_release_transport(hisi_sas_stt);

	debugfs_remove(hisi_sas_debugfs_dir);
}

module_init(hisi_sas_init);
module_exit(hisi_sas_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("John Garry <john.garry@huawei.com>");
MODULE_DESCRIPTION("HISILICON SAS controller driver");
MODULE_ALIAS("platform:" DRV_NAME);