// 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_debug_issue_ssp_tmf(struct domain_device *device,
                                u8 *lun, struct hisi_sas_tmf_task *tmf);
static int
hisi_sas_internal_task_abort(struct hisi_hba *hisi_hba,
                             struct domain_device *device,
                             int abort_flag, int tag, bool rst_to_recover);
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);

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;
}

static void hisi_sas_slot_index_init(struct hisi_hba *hisi_hba)
{
        int i;

        for (i = 0; i < hisi_hba->slot_index_count; ++i)
                hisi_sas_slot_index_clear(hisi_hba, i);
}

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)
                                dma_unmap_sg(dev, task->scatter,
                                             task->num_scatter,
                                             task->data_dir);
                        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,
                int device_id, int abort_flag, int tag_to_abort)
{
        hisi_hba->hw->prep_abort(hisi_hba, slot,
                        device_id, abort_flag, tag_to_abort);
}

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

        if (!sas_protocol_ata(task->task_proto)) {
                if (task->num_scatter) {
                        if (n_elem)
                                dma_unmap_sg(dev, task->scatter,
                                             task->num_scatter,
                                             task->data_dir);
                } else if (task->task_proto & SAS_PROTOCOL_SMP) {
                        if (n_elem_req)
                                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,
                            int *n_elem_req)
{
        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_req = dma_map_sg(dev, &task->smp_task.smp_req,
                                                 1, DMA_TO_DEVICE);
                        if (!*n_elem_req) {
                                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,
                           *n_elem_req);
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 int hisi_sas_task_prep(struct sas_task *task,
                              struct hisi_sas_dq **dq_pointer,
                              bool is_tmf, struct hisi_sas_tmf_task *tmf,
                              int *pass)
{
        struct domain_device *device = task->dev;
        struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
        struct hisi_sas_device *sas_dev = device->lldd_dev;
        struct hisi_sas_port *port;
        struct hisi_sas_slot *slot;
        struct hisi_sas_cmd_hdr *cmd_hdr_base;
        struct asd_sas_port *sas_port = device->port;
        struct device *dev = hisi_hba->dev;
        int dlvry_queue_slot, dlvry_queue, rc, slot_idx;
        int n_elem = 0, n_elem_dif = 0, n_elem_req = 0;
        struct scsi_cmnd *scmd = NULL;
        struct hisi_sas_dq *dq;
        unsigned long flags;
        int wr_q_index;

        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;
        }

        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_pointer = 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_pointer = dq = &hisi_hba->dq[queue];
        }

        port = to_hisi_sas_port(sas_port);
        if (port && !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;
        }

        rc = hisi_sas_dma_map(hisi_hba, task, &n_elem,
                              &n_elem_req);
        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 (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_idx = rc;
        slot = &hisi_hba->slot_info[slot_idx];

        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->n_elem = n_elem;
        slot->n_elem_dif = n_elem_dif;
        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];
        slot->task = task;
        slot->port = port;
        slot->tmf = tmf;
        slot->is_internal = is_tmf;
        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_SATA | SAS_PROTOCOL_STP:
                hisi_sas_task_prep_ata(hisi_hba, slot);
                break;
        default:
                dev_err(dev, "task prep: unknown/unsupported proto (0x%x)\n",
                        task->task_proto);
                break;
        }

        spin_lock_irqsave(&task->task_state_lock, flags);
        task->task_state_flags |= SAS_TASK_AT_INITIATOR;
        spin_unlock_irqrestore(&task->task_state_lock, flags);

        ++(*pass);
        WRITE_ONCE(slot->ready, 1);

        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,
                           n_elem_req);
prep_out:
        dev_err(dev, "task prep: failed[%d]!\n", rc);
        return rc;
}

static int hisi_sas_task_exec(struct sas_task *task, gfp_t gfp_flags,
                              bool is_tmf, struct hisi_sas_tmf_task *tmf)
{
        u32 rc;
        u32 pass = 0;
        struct hisi_hba *hisi_hba;
        struct device *dev;
        struct domain_device *device = task->dev;
        struct asd_sas_port *sas_port = device->port;
        struct hisi_sas_dq *dq = NULL;

        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)
                        task->task_done(task);
                return -ECOMM;
        }

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

        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);
        }

        /* protect task_prep and start_delivery sequence */
        rc = hisi_sas_task_prep(task, &dq, is_tmf, tmf, &pass);
        if (rc)
                dev_err(dev, "task exec: failed[%d]!\n", rc);

        if (likely(pass)) {
                spin_lock(&dq->lock);
                hisi_hba->hw->start_delivery(dq);
                spin_unlock(&dq->lock);
        }

        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;

        if (test_bit(HISI_SAS_PM_BIT, &hisi_hba->flags) &&
            !sas_phy->suspended) {
                dev_warn(hisi_hba->dev, "phy%d during suspend filtered out\n", phy_no);
                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;
}

#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;
        struct hisi_sas_tmf_task tmf_task;
        int retry = HISI_SAS_DISK_RECOVER_CNT;
        struct hisi_hba *hisi_hba = dev_to_hisi_hba(device);
        struct device *dev = hisi_hba->dev;
        struct sas_phy *local_phy;

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

                tmf_task.tmf = TMF_CLEAR_TASK_SET;
                while (retry-- > 0) {
                        rc = hisi_sas_debug_issue_ssp_tmf(device, lun.scsi_lun,
                                                          &tmf_task);
                        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:
                /*
                 * send HARD RESET to clear previous affiliation of
                 * STP target port
                 */
                local_phy = sas_get_local_phy(device);
                if (!scsi_is_sas_phy_local(local_phy) &&
                    !test_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags)) {
                        unsigned long deadline = ata_deadline(jiffies, 20000);
                        struct sata_device *sata_dev = &device->sata_dev;
                        struct ata_host *ata_host = sata_dev->ata_host;
                        struct ata_port_operations *ops = ata_host->ops;
                        struct ata_port *ap = sata_dev->ap;
                        struct ata_link *link;
                        unsigned int classes;

                        ata_for_each_link(link, ap, EDGE)
                                rc = ops->hardreset(link, &classes,
                                                    deadline);
                }
                sas_put_local_phy(local_phy);
                if (rc) {
                        dev_warn(dev, "SATA disk hardreset fail: %d\n", rc);
                        return rc;
                }

                while (retry-- > 0) {
                        rc = hisi_sas_softreset_ata_disk(device);
                        if (!rc)
                                break;
                }
                break;
        default:
                break;
        }

        return rc;
}

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);

        rc = hisi_sas_init_device(device);
        if (rc)
                goto err_out;
        sas_dev->dev_status = HISI_SAS_DEV_NORMAL;
        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(struct work_struct *work)
{
        struct hisi_sas_phy *phy =
                container_of(work, typeof(*phy), works[HISI_PHYE_PHY_UP]);
        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_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 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,
};

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;

        dev_dbg(dev, "phy%d OOB ready\n", phy_no);
        if (phy->phy_attached)
                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);
                } else {
                        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;
                }
        }
}
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 | SAS_TASK_AT_INITIATOR);
                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 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_RESET_BIT, &hisi_hba->flags)) {
                hisi_sas_internal_task_abort(hisi_hba, device,
                                             HISI_SAS_INT_ABT_DEV, 0, 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_queue_command(struct sas_task *task, gfp_t gfp_flags)
{
        return hisi_sas_task_exec(task, gfp_flags, 0, NULL);
}

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 sas_ha_struct *sas_ha = sas_phy->ha;
        struct hisi_hba *hisi_hba = sas_ha->lldd_ha;
        int phy_no = sas_phy->id;

        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);
                break;

        case PHY_FUNC_SET_LINK_RATE:
                return hisi_sas_phy_set_linkrate(hisi_hba, phy_no, funcdata);
        case PHY_FUNC_GET_EVENTS:
                if (hisi_hba->hw->get_events) {
                        hisi_hba->hw->get_events(hisi_hba, phy_no);
                        break;
                }
                fallthrough;
        case PHY_FUNC_RELEASE_SPINUP_HOLD:
        default:
                return -EOPNOTSUPP;
        }
        return 0;
}

static void hisi_sas_task_done(struct sas_task *task)
{
        del_timer(&task->slow_task->timer);
        complete(&task->slow_task->completion);
}

static void hisi_sas_tmf_timedout(struct timer_list *t)
{
        struct sas_task_slow *slow = from_timer(slow, t, timer);
        struct sas_task *task = slow->task;
        unsigned long flags;
        bool is_completed = true;

        spin_lock_irqsave(&task->task_state_lock, flags);
        if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
                task->task_state_flags |= SAS_TASK_STATE_ABORTED;
                is_completed = false;
        }
        spin_unlock_irqrestore(&task->task_state_lock, flags);

        if (!is_completed)
                complete(&task->slow_task->completion);
}

#define TASK_TIMEOUT                    (20 * HZ)
#define TASK_RETRY                      3
#define INTERNAL_ABORT_TIMEOUT          (6 * HZ)
static int hisi_sas_exec_internal_tmf_task(struct domain_device *device,
                                           void *parameter, u32 para_len,
                                           struct hisi_sas_tmf_task *tmf)
{
        struct hisi_sas_device *sas_dev = device->lldd_dev;
        struct hisi_hba *hisi_hba = sas_dev->hisi_hba;
        struct device *dev = hisi_hba->dev;
        struct sas_task *task;
        int res, retry;

        for (retry = 0; retry < TASK_RETRY; retry++) {
                task = sas_alloc_slow_task(GFP_KERNEL);
                if (!task)
                        return -ENOMEM;

                task->dev = device;
                task->task_proto = device->tproto;

                if (dev_is_sata(device)) {
                        task->ata_task.device_control_reg_update = 1;
                        memcpy(&task->ata_task.fis, parameter, para_len);
                } else {
                        memcpy(&task->ssp_task, parameter, para_len);
                }
                task->task_done = hisi_sas_task_done;

                task->slow_task->timer.function = hisi_sas_tmf_timedout;
                task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
                add_timer(&task->slow_task->timer);

                res = hisi_sas_task_exec(task, GFP_KERNEL, 1, tmf);

                if (res) {
                        del_timer(&task->slow_task->timer);
                        dev_err(dev, "abort tmf: executing internal task failed: %d\n",
                                res);
                        goto ex_err;
                }

                wait_for_completion(&task->slow_task->completion);
                res = TMF_RESP_FUNC_FAILED;
                /* Even TMF timed out, return direct. */
                if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
                        if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
                                struct hisi_sas_slot *slot = task->lldd_task;

                                dev_err(dev, "abort tmf: TMF task timeout and not done\n");
                                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;
                                }

                                goto ex_err;
                        } else
                                dev_err(dev, "abort tmf: TMF task timeout\n");
                }

                if (task->task_status.resp == SAS_TASK_COMPLETE &&
                     task->task_status.stat == TMF_RESP_FUNC_COMPLETE) {
                        res = TMF_RESP_FUNC_COMPLETE;
                        break;
                }

                if (task->task_status.resp == SAS_TASK_COMPLETE &&
                        task->task_status.stat == TMF_RESP_FUNC_SUCC) {
                        res = TMF_RESP_FUNC_SUCC;
                        break;
                }

                if (task->task_status.resp == SAS_TASK_COMPLETE &&
                      task->task_status.stat == SAS_DATA_UNDERRUN) {
                        /* no error, but return the number of bytes of
                         * underrun
                         */
                        dev_warn(dev, "abort tmf: task to dev %016llx resp: 0x%x sts 0x%x underrun\n",
                                 SAS_ADDR(device->sas_addr),
                                 task->task_status.resp,
                                 task->task_status.stat);
                        res = task->task_status.residual;
                        break;
                }

                if (task->task_status.resp == SAS_TASK_COMPLETE &&
                        task->task_status.stat == SAS_DATA_OVERRUN) {
                        dev_warn(dev, "abort tmf: blocked task error\n");
                        res = -EMSGSIZE;
                        break;
                }

                if (task->task_status.resp == SAS_TASK_COMPLETE &&
                    task->task_status.stat == SAS_OPEN_REJECT) {
                        dev_warn(dev, "abort tmf: open reject failed\n");
                        res = -EIO;
                } else {
                        dev_warn(dev, "abort tmf: task to dev %016llx resp: 0x%x status 0x%x\n",
                                 SAS_ADDR(device->sas_addr),
                                 task->task_status.resp,
                                 task->task_status.stat);
                }
                sas_free_task(task);
                task = NULL;
        }
ex_err:
        if (retry == TASK_RETRY)
                dev_warn(dev, "abort tmf: executing internal task failed!\n");
        sas_free_task(task);
        return res;
}

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;
        int s = sizeof(struct host_to_dev_fis);

        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 = hisi_sas_exec_internal_tmf_task(device, fis, s, NULL);
                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 = hisi_sas_exec_internal_tmf_task(device, fis,
                                                             s, NULL);
                        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 int hisi_sas_debug_issue_ssp_tmf(struct domain_device *device,
                                u8 *lun, struct hisi_sas_tmf_task *tmf)
{
        struct sas_ssp_task ssp_task;

        if (!(device->tproto & SAS_PROTOCOL_SSP))
                return TMF_RESP_FUNC_ESUPP;

        memcpy(ssp_task.LUN, lun, 8);

        return hisi_sas_exec_internal_tmf_task(device, &ssp_task,
                                sizeof(ssp_task), tmf);
}

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);

                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;
                        }

                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 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);
                }
        }
}

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 hisi_sas_tmf_task tmf_task = { .force_phy = 1 };
        struct ata_port *ap = device->sata_dev.ap;
        struct device *dev = hisi_hba->dev;
        int s = sizeof(struct host_to_dev_fis);
        int rc = TMF_RESP_FUNC_FAILED;
        struct asd_sas_phy *sas_phy;
        struct ata_link *link;
        u8 fis[20] = {0};
        u32 state;

        state = hisi_hba->hw->get_phys_state(hisi_hba);
        list_for_each_entry(sas_phy, &sas_port->phy_list, port_phy_el) {
                if (!(state & BIT(sas_phy->id)))
                        continue;

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

                        tmf_task.phy_id = sas_phy->id;
                        hisi_sas_fill_ata_reset_cmd(link->device, 1, pmp, fis);
                        rc = hisi_sas_exec_internal_tmf_task(device, fis, s,
                                                             &tmf_task);
                        if (rc != TMF_RESP_FUNC_COMPLETE) {
                                dev_err(dev, "phy%d ata reset failed rc=%d\n",
                                        sas_phy->id, 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(hisi_hba, device,
                                                  HISI_SAS_INT_ABT_DEV, 0,
                                                  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;

        down(&hisi_hba->sem);
        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);

        if (timer_pending(&hisi_hba->timer))
                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);
        up(&hisi_hba->sem);
        scsi_unblock_requests(shost);
        clear_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags);

        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;

        if (test_and_set_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags))
                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_RESET_BIT, &hisi_hba->flags);
                return rc;
        }

        hisi_sas_controller_reset_done(hisi_hba);
        clear_bit(HISI_SAS_HW_FAULT_BIT, &hisi_hba->flags);
        dev_info(dev, "controller reset complete\n");

        return 0;
}

static int hisi_sas_abort_task(struct sas_task *task)
{
        struct scsi_lun lun;
        struct hisi_sas_tmf_task tmf_task;
        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 scsi_cmnd *cmnd = task->uldd_task;
                struct hisi_sas_slot *slot = task->lldd_task;
                u16 tag = slot->idx;
                int rc2;

                int_to_scsilun(cmnd->device->lun, &lun);
                tmf_task.tmf = TMF_ABORT_TASK;
                tmf_task.tag_of_task_to_be_managed = tag;

                rc = hisi_sas_debug_issue_ssp_tmf(task->dev, lun.scsi_lun,
                                                  &tmf_task);

                rc2 = hisi_sas_internal_task_abort(hisi_hba, device,
                                                   HISI_SAS_INT_ABT_CMD, tag,
                                                   false);
                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(hisi_hba, device,
                                                          HISI_SAS_INT_ABT_DEV,
                                                          0, 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 = hisi_sas_internal_task_abort(hisi_hba, device,
                                                  HISI_SAS_INT_ABT_CMD, tag,
                                                  false);
                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_hba *hisi_hba = dev_to_hisi_hba(device);
        struct device *dev = hisi_hba->dev;
        struct hisi_sas_tmf_task tmf_task;
        int rc;

        rc = hisi_sas_internal_task_abort(hisi_hba, device,
                                          HISI_SAS_INT_ABT_DEV, 0, 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);

        tmf_task.tmf = TMF_ABORT_TASK_SET;
        rc = hisi_sas_debug_issue_ssp_tmf(device, lun, &tmf_task);

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

        return rc;
}

static int hisi_sas_clear_aca(struct domain_device *device, u8 *lun)
{
        struct hisi_sas_tmf_task tmf_task;
        int rc;

        tmf_task.tmf = TMF_CLEAR_ACA;
        rc = hisi_sas_debug_issue_ssp_tmf(device, lun, &tmf_task);

        return rc;
}

#define I_T_NEXUS_RESET_PHYUP_TIMEOUT  (2 * HZ)

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;
        DECLARE_COMPLETION_ONSTACK(phyreset);
        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);
                phy->in_reset = 1;
                phy->reset_completion = &phyreset;
        }

        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);
                int ret = wait_for_completion_timeout(&phyreset,
                                                I_T_NEXUS_RESET_PHYUP_TIMEOUT);
                unsigned long flags;

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

                /* report PHY down if timed out */
                if (!ret)
                        hisi_sas_phy_down(hisi_hba, sas_phy->id, 0, GFP_KERNEL);
        } else if (sas_dev->dev_status != HISI_SAS_DEV_INIT) {
                /*
                 * If in init state, we rely on caller to wait for link to be
                 * ready; otherwise, except phy reset is fail, delay.
                 */
                if (!rc)
                        msleep(2000);
        }

        return rc;
}

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

        rc = hisi_sas_internal_task_abort(hisi_hba, device,
                                          HISI_SAS_INT_ABT_DEV, 0, 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);

        if (dev_is_sata(device)) {
                rc = hisi_sas_softreset_ata_disk(device);
                if (rc == TMF_RESP_FUNC_FAILED)
                        return TMF_RESP_FUNC_FAILED;
        }

        rc = hisi_sas_debug_I_T_nexus_reset(device);

        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(hisi_hba, device,
                                          HISI_SAS_INT_ABT_DEV, 0, 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 {
                struct hisi_sas_tmf_task tmf_task = { .tmf =  TMF_LU_RESET };

                rc = hisi_sas_debug_issue_ssp_tmf(device, lun, &tmf_task);
                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;

        queue_work(hisi_hba->wq, &r.work);
        wait_for_completion(r.completion);
        if (!r.done)
                return TMF_RESP_FUNC_FAILED;

        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);

        return TMF_RESP_FUNC_COMPLETE;
}

static int hisi_sas_query_task(struct sas_task *task)
{
        struct scsi_lun lun;
        struct hisi_sas_tmf_task tmf_task;
        int rc = TMF_RESP_FUNC_FAILED;

        if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SSP) {
                struct scsi_cmnd *cmnd = task->uldd_task;
                struct domain_device *device = task->dev;
                struct hisi_sas_slot *slot = task->lldd_task;
                u32 tag = slot->idx;

                int_to_scsilun(cmnd->device->lun, &lun);
                tmf_task.tmf = TMF_QUERY_TASK;
                tmf_task.tag_of_task_to_be_managed = tag;

                rc = hisi_sas_debug_issue_ssp_tmf(device,
                                                  lun.scsi_lun,
                                                  &tmf_task);
                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 int
hisi_sas_internal_abort_task_exec(struct hisi_hba *hisi_hba, int device_id,
                                  struct sas_task *task, int abort_flag,
                                  int task_tag, struct hisi_sas_dq *dq)
{
        struct domain_device *device = task->dev;
        struct hisi_sas_device *sas_dev = device->lldd_dev;
        struct device *dev = hisi_hba->dev;
        struct hisi_sas_port *port;
        struct hisi_sas_slot *slot;
        struct asd_sas_port *sas_port = device->port;
        struct hisi_sas_cmd_hdr *cmd_hdr_base;
        int dlvry_queue_slot, dlvry_queue, n_elem = 0, rc, slot_idx;
        unsigned long flags;
        int wr_q_index;

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

        if (!device->port)
                return -1;

        port = to_hisi_sas_port(sas_port);

        /* simply get a slot and send abort command */
        rc = hisi_sas_slot_index_alloc(hisi_hba, NULL);
        if (rc < 0)
                goto err_out;

        slot_idx = rc;
        slot = &hisi_hba->slot_info[slot_idx];

        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->n_elem = n_elem;
        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];
        slot->task = task;
        slot->port = port;
        slot->is_internal = true;
        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));

        hisi_sas_task_prep_abort(hisi_hba, slot, device_id,
                                      abort_flag, task_tag);

        spin_lock_irqsave(&task->task_state_lock, flags);
        task->task_state_flags |= SAS_TASK_AT_INITIATOR;
        spin_unlock_irqrestore(&task->task_state_lock, flags);
        WRITE_ONCE(slot->ready, 1);
        /* send abort command to the chip */
        spin_lock(&dq->lock);
        hisi_hba->hw->start_delivery(dq);
        spin_unlock(&dq->lock);

        return 0;

err_out:
        dev_err(dev, "internal abort task prep: failed[%d]!\n", rc);

        return rc;
}

/**
 * _hisi_sas_internal_task_abort -- execute an internal
 * abort command for single IO command or a device
 * @hisi_hba: host controller struct
 * @device: domain device
 * @abort_flag: mode of operation, device or single IO
 * @tag: tag of IO to be aborted (only relevant to single
 *       IO mode)
 * @dq: delivery queue for this internal abort command
 * @rst_to_recover: If rst_to_recover set, queue a controller
 *                  reset if an internal abort times out.
 */
static int
_hisi_sas_internal_task_abort(struct hisi_hba *hisi_hba,
                              struct domain_device *device, int abort_flag,
                              int tag, struct hisi_sas_dq *dq, bool rst_to_recover)
{
        struct sas_task *task;
        struct hisi_sas_device *sas_dev = device->lldd_dev;
        struct device *dev = hisi_hba->dev;
        int res;

        /*
         * The interface is not realized means this HW don't support internal
         * abort, or don't need to do internal abort. Then here, we return
         * TMF_RESP_FUNC_FAILED and let other steps go on, which depends that
         * the internal abort has been executed and returned CQ.
         */
        if (!hisi_hba->hw->prep_abort)
                return TMF_RESP_FUNC_FAILED;

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

        task = sas_alloc_slow_task(GFP_KERNEL);
        if (!task)
                return -ENOMEM;

        task->dev = device;
        task->task_proto = device->tproto;
        task->task_done = hisi_sas_task_done;
        task->slow_task->timer.function = hisi_sas_tmf_timedout;
        task->slow_task->timer.expires = jiffies + INTERNAL_ABORT_TIMEOUT;
        add_timer(&task->slow_task->timer);

        res = hisi_sas_internal_abort_task_exec(hisi_hba, sas_dev->device_id,
                                                task, abort_flag, tag, dq);
        if (res) {
                del_timer(&task->slow_task->timer);
                dev_err(dev, "internal task abort: executing internal task failed: %d\n",
                        res);
                goto exit;
        }
        wait_for_completion(&task->slow_task->completion);
        res = TMF_RESP_FUNC_FAILED;

        /* Internal abort timed out */
        if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
                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)) {
                        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 (rst_to_recover) {
                                dev_err(dev, "internal task abort: timeout and not done. Queuing reset.\n");
                                queue_work(hisi_hba->wq, &hisi_hba->rst_work);
                        } else {
                                dev_err(dev, "internal task abort: timeout and not done.\n");
                        }

                        res = -EIO;
                        goto exit;
                } else
                        dev_err(dev, "internal task abort: timeout.\n");
        }

        if (task->task_status.resp == SAS_TASK_COMPLETE &&
                task->task_status.stat == TMF_RESP_FUNC_COMPLETE) {
                res = TMF_RESP_FUNC_COMPLETE;
                goto exit;
        }

        if (task->task_status.resp == SAS_TASK_COMPLETE &&
                task->task_status.stat == TMF_RESP_FUNC_SUCC) {
                res = TMF_RESP_FUNC_SUCC;
                goto exit;
        }

exit:
        dev_dbg(dev, "internal task abort: task to dev %016llx task=%pK resp: 0x%x sts 0x%x\n",
                SAS_ADDR(device->sas_addr), task,
                task->task_status.resp, /* 0 is complete, -1 is undelivered */
                task->task_status.stat);
        sas_free_task(task);

        return res;
}

static int
hisi_sas_internal_task_abort(struct hisi_hba *hisi_hba,
                             struct domain_device *device,
                             int abort_flag, int tag, bool rst_to_recover)
{
        struct hisi_sas_slot *slot;
        struct device *dev = hisi_hba->dev;
        struct hisi_sas_dq *dq;
        int i, rc;

        switch (abort_flag) {
        case HISI_SAS_INT_ABT_CMD:
                slot = &hisi_hba->slot_info[tag];
                dq = &hisi_hba->dq[slot->dlvry_queue];
                return _hisi_sas_internal_task_abort(hisi_hba, device,
                                                     abort_flag, tag, dq,
                                                     rst_to_recover);
        case HISI_SAS_INT_ABT_DEV:
                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;
                        dq = &hisi_hba->dq[i];
                        rc = _hisi_sas_internal_task_abort(hisi_hba, device,
                                                           abort_flag, tag,
                                                           dq, rst_to_recover);
                        if (rc)
                                return rc;
                }
                break;
        default:
                dev_err(dev, "Unrecognised internal abort flag (%d)\n",
                        abort_flag);
                return -EINVAL;
        }

        return 0;
}

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_RESET_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_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_clear_aca         = hisi_sas_clear_aca,
        .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,
};

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;

        hisi_hba->slot_index_count = max_command_entries;
        s = hisi_hba->slot_index_count / BITS_PER_BYTE;
        hisi_hba->slot_index_tags = devm_kzalloc(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_sas_slot_index_init(hisi_hba);
        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)
                error = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));

        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;

        if (timer_pending(&hisi_hba->timer))
                del_timer(&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);