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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/scsi/snic/snic_disc.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/scsi/snic/snic_disc.c')
-rw-r--r-- | drivers/scsi/snic/snic_disc.c | 554 |
1 files changed, 554 insertions, 0 deletions
diff --git a/drivers/scsi/snic/snic_disc.c b/drivers/scsi/snic/snic_disc.c new file mode 100644 index 000000000..6c529b37f --- /dev/null +++ b/drivers/scsi/snic/snic_disc.c @@ -0,0 +1,554 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright 2014 Cisco Systems, Inc. All rights reserved. + +#include <linux/errno.h> +#include <linux/mempool.h> + +#include <scsi/scsi_tcq.h> + +#include "snic_disc.h" +#include "snic.h" +#include "snic_io.h" + + +/* snic target types */ +static const char * const snic_tgt_type_str[] = { + [SNIC_TGT_DAS] = "DAS", + [SNIC_TGT_SAN] = "SAN", +}; + +static inline const char * +snic_tgt_type_to_str(int typ) +{ + return ((typ > SNIC_TGT_NONE && typ <= SNIC_TGT_SAN) ? + snic_tgt_type_str[typ] : "Unknown"); +} + +static const char * const snic_tgt_state_str[] = { + [SNIC_TGT_STAT_INIT] = "INIT", + [SNIC_TGT_STAT_ONLINE] = "ONLINE", + [SNIC_TGT_STAT_OFFLINE] = "OFFLINE", + [SNIC_TGT_STAT_DEL] = "DELETION IN PROGRESS", +}; + +const char * +snic_tgt_state_to_str(int state) +{ + return ((state >= SNIC_TGT_STAT_INIT && state <= SNIC_TGT_STAT_DEL) ? + snic_tgt_state_str[state] : "UNKNOWN"); +} + +/* + * Initiate report_tgt req desc + */ +static void +snic_report_tgt_init(struct snic_host_req *req, u32 hid, u8 *buf, u32 len, + dma_addr_t rsp_buf_pa, ulong ctx) +{ + struct snic_sg_desc *sgd = NULL; + + + snic_io_hdr_enc(&req->hdr, SNIC_REQ_REPORT_TGTS, 0, SCSI_NO_TAG, hid, + 1, ctx); + + req->u.rpt_tgts.sg_cnt = cpu_to_le16(1); + sgd = req_to_sgl(req); + sgd[0].addr = cpu_to_le64(rsp_buf_pa); + sgd[0].len = cpu_to_le32(len); + sgd[0]._resvd = 0; + req->u.rpt_tgts.sg_addr = cpu_to_le64((ulong)sgd); +} + +/* + * snic_queue_report_tgt_req: Queues report target request. + */ +static int +snic_queue_report_tgt_req(struct snic *snic) +{ + struct snic_req_info *rqi = NULL; + u32 ntgts, buf_len = 0; + u8 *buf = NULL; + dma_addr_t pa = 0; + int ret = 0; + + rqi = snic_req_init(snic, 1); + if (!rqi) { + ret = -ENOMEM; + goto error; + } + + if (snic->fwinfo.max_tgts) + ntgts = min_t(u32, snic->fwinfo.max_tgts, snic->shost->max_id); + else + ntgts = snic->shost->max_id; + + /* Allocate Response Buffer */ + SNIC_BUG_ON(ntgts == 0); + buf_len = ntgts * sizeof(struct snic_tgt_id) + SNIC_SG_DESC_ALIGN; + + buf = kzalloc(buf_len, GFP_KERNEL); + if (!buf) { + snic_req_free(snic, rqi); + SNIC_HOST_ERR(snic->shost, "Resp Buf Alloc Failed.\n"); + + ret = -ENOMEM; + goto error; + } + + SNIC_BUG_ON((((unsigned long)buf) % SNIC_SG_DESC_ALIGN) != 0); + + pa = dma_map_single(&snic->pdev->dev, buf, buf_len, DMA_FROM_DEVICE); + if (dma_mapping_error(&snic->pdev->dev, pa)) { + SNIC_HOST_ERR(snic->shost, + "Rpt-tgt rspbuf %p: PCI DMA Mapping Failed\n", + buf); + kfree(buf); + snic_req_free(snic, rqi); + ret = -EINVAL; + + goto error; + } + + + SNIC_BUG_ON(pa == 0); + rqi->sge_va = (ulong) buf; + + snic_report_tgt_init(rqi->req, + snic->config.hid, + buf, + buf_len, + pa, + (ulong)rqi); + + snic_handle_untagged_req(snic, rqi); + + ret = snic_queue_wq_desc(snic, rqi->req, rqi->req_len); + if (ret) { + dma_unmap_single(&snic->pdev->dev, pa, buf_len, + DMA_FROM_DEVICE); + kfree(buf); + rqi->sge_va = 0; + snic_release_untagged_req(snic, rqi); + SNIC_HOST_ERR(snic->shost, "Queuing Report Tgts Failed.\n"); + + goto error; + } + + SNIC_DISC_DBG(snic->shost, "Report Targets Issued.\n"); + + return ret; + +error: + SNIC_HOST_ERR(snic->shost, + "Queuing Report Targets Failed, err = %d\n", + ret); + return ret; +} /* end of snic_queue_report_tgt_req */ + +/* call into SML */ +static void +snic_scsi_scan_tgt(struct work_struct *work) +{ + struct snic_tgt *tgt = container_of(work, struct snic_tgt, scan_work); + struct Scsi_Host *shost = dev_to_shost(&tgt->dev); + unsigned long flags; + + SNIC_HOST_INFO(shost, "Scanning Target id 0x%x\n", tgt->id); + scsi_scan_target(&tgt->dev, + tgt->channel, + tgt->scsi_tgt_id, + SCAN_WILD_CARD, + SCSI_SCAN_RESCAN); + + spin_lock_irqsave(shost->host_lock, flags); + tgt->flags &= ~SNIC_TGT_SCAN_PENDING; + spin_unlock_irqrestore(shost->host_lock, flags); +} /* end of snic_scsi_scan_tgt */ + +/* + * snic_tgt_lookup : + */ +static struct snic_tgt * +snic_tgt_lookup(struct snic *snic, struct snic_tgt_id *tgtid) +{ + struct list_head *cur, *nxt; + struct snic_tgt *tgt = NULL; + + list_for_each_safe(cur, nxt, &snic->disc.tgt_list) { + tgt = list_entry(cur, struct snic_tgt, list); + if (tgt->id == le32_to_cpu(tgtid->tgt_id)) + return tgt; + tgt = NULL; + } + + return tgt; +} /* end of snic_tgt_lookup */ + +/* + * snic_tgt_dev_release : Called on dropping last ref for snic_tgt object + */ +void +snic_tgt_dev_release(struct device *dev) +{ + struct snic_tgt *tgt = dev_to_tgt(dev); + + SNIC_HOST_INFO(snic_tgt_to_shost(tgt), + "Target Device ID %d (%s) Permanently Deleted.\n", + tgt->id, + dev_name(dev)); + + SNIC_BUG_ON(!list_empty(&tgt->list)); + kfree(tgt); +} + +/* + * snic_tgt_del : work function to delete snic_tgt + */ +static void +snic_tgt_del(struct work_struct *work) +{ + struct snic_tgt *tgt = container_of(work, struct snic_tgt, del_work); + struct Scsi_Host *shost = snic_tgt_to_shost(tgt); + + if (tgt->flags & SNIC_TGT_SCAN_PENDING) + scsi_flush_work(shost); + + /* Block IOs on child devices, stops new IOs */ + scsi_target_block(&tgt->dev); + + /* Cleanup IOs */ + snic_tgt_scsi_abort_io(tgt); + + /* Unblock IOs now, to flush if there are any. */ + scsi_target_unblock(&tgt->dev, SDEV_TRANSPORT_OFFLINE); + + /* Delete SCSI Target and sdevs */ + scsi_remove_target(&tgt->dev); /* ?? */ + device_del(&tgt->dev); + put_device(&tgt->dev); +} /* end of snic_tgt_del */ + +/* snic_tgt_create: checks for existence of snic_tgt, if it doesn't + * it creates one. + */ +static struct snic_tgt * +snic_tgt_create(struct snic *snic, struct snic_tgt_id *tgtid) +{ + struct snic_tgt *tgt = NULL; + unsigned long flags; + int ret; + + tgt = snic_tgt_lookup(snic, tgtid); + if (tgt) { + /* update the information if required */ + return tgt; + } + + tgt = kzalloc(sizeof(*tgt), GFP_KERNEL); + if (!tgt) { + SNIC_HOST_ERR(snic->shost, "Failure to allocate snic_tgt.\n"); + ret = -ENOMEM; + + return tgt; + } + + INIT_LIST_HEAD(&tgt->list); + tgt->id = le32_to_cpu(tgtid->tgt_id); + tgt->channel = 0; + + SNIC_BUG_ON(le16_to_cpu(tgtid->tgt_type) > SNIC_TGT_SAN); + tgt->tdata.typ = le16_to_cpu(tgtid->tgt_type); + + /* + * Plugging into SML Device Tree + */ + tgt->tdata.disc_id = 0; + tgt->state = SNIC_TGT_STAT_INIT; + device_initialize(&tgt->dev); + tgt->dev.parent = get_device(&snic->shost->shost_gendev); + tgt->dev.release = snic_tgt_dev_release; + INIT_WORK(&tgt->scan_work, snic_scsi_scan_tgt); + INIT_WORK(&tgt->del_work, snic_tgt_del); + switch (tgt->tdata.typ) { + case SNIC_TGT_DAS: + dev_set_name(&tgt->dev, "snic_das_tgt:%d:%d-%d", + snic->shost->host_no, tgt->channel, tgt->id); + break; + + case SNIC_TGT_SAN: + dev_set_name(&tgt->dev, "snic_san_tgt:%d:%d-%d", + snic->shost->host_no, tgt->channel, tgt->id); + break; + + default: + SNIC_HOST_INFO(snic->shost, "Target type Unknown Detected.\n"); + dev_set_name(&tgt->dev, "snic_das_tgt:%d:%d-%d", + snic->shost->host_no, tgt->channel, tgt->id); + break; + } + + spin_lock_irqsave(snic->shost->host_lock, flags); + list_add_tail(&tgt->list, &snic->disc.tgt_list); + tgt->scsi_tgt_id = snic->disc.nxt_tgt_id++; + tgt->state = SNIC_TGT_STAT_ONLINE; + spin_unlock_irqrestore(snic->shost->host_lock, flags); + + SNIC_HOST_INFO(snic->shost, + "Tgt %d, type = %s detected. Adding..\n", + tgt->id, snic_tgt_type_to_str(tgt->tdata.typ)); + + ret = device_add(&tgt->dev); + if (ret) { + SNIC_HOST_ERR(snic->shost, + "Snic Tgt: device_add, with err = %d\n", + ret); + + put_device(&snic->shost->shost_gendev); + spin_lock_irqsave(snic->shost->host_lock, flags); + list_del(&tgt->list); + spin_unlock_irqrestore(snic->shost->host_lock, flags); + put_device(&tgt->dev); + tgt = NULL; + + return tgt; + } + + SNIC_HOST_INFO(snic->shost, "Scanning %s.\n", dev_name(&tgt->dev)); + + scsi_queue_work(snic->shost, &tgt->scan_work); + + return tgt; +} /* end of snic_tgt_create */ + +/* Handler for discovery */ +void +snic_handle_tgt_disc(struct work_struct *work) +{ + struct snic *snic = container_of(work, struct snic, tgt_work); + struct snic_tgt_id *tgtid = NULL; + struct snic_tgt *tgt = NULL; + unsigned long flags; + int i; + + spin_lock_irqsave(&snic->snic_lock, flags); + if (snic->in_remove) { + spin_unlock_irqrestore(&snic->snic_lock, flags); + kfree(snic->disc.rtgt_info); + + return; + } + spin_unlock_irqrestore(&snic->snic_lock, flags); + + mutex_lock(&snic->disc.mutex); + /* Discover triggered during disc in progress */ + if (snic->disc.req_cnt) { + snic->disc.state = SNIC_DISC_DONE; + snic->disc.req_cnt = 0; + mutex_unlock(&snic->disc.mutex); + kfree(snic->disc.rtgt_info); + snic->disc.rtgt_info = NULL; + + SNIC_HOST_INFO(snic->shost, "tgt_disc: Discovery restart.\n"); + /* Start Discovery Again */ + snic_disc_start(snic); + + return; + } + + tgtid = (struct snic_tgt_id *)snic->disc.rtgt_info; + + SNIC_BUG_ON(snic->disc.rtgt_cnt == 0 || tgtid == NULL); + + for (i = 0; i < snic->disc.rtgt_cnt; i++) { + tgt = snic_tgt_create(snic, &tgtid[i]); + if (!tgt) { + int buf_sz = snic->disc.rtgt_cnt * sizeof(*tgtid); + + SNIC_HOST_ERR(snic->shost, "Failed to create tgt.\n"); + snic_hex_dump("rpt_tgt_rsp", (char *)tgtid, buf_sz); + break; + } + } + + snic->disc.rtgt_info = NULL; + snic->disc.state = SNIC_DISC_DONE; + mutex_unlock(&snic->disc.mutex); + + SNIC_HOST_INFO(snic->shost, "Discovery Completed.\n"); + + kfree(tgtid); +} /* end of snic_handle_tgt_disc */ + + +int +snic_report_tgt_cmpl_handler(struct snic *snic, struct snic_fw_req *fwreq) +{ + + u8 typ, cmpl_stat; + u32 cmnd_id, hid, tgt_cnt = 0; + ulong ctx; + struct snic_req_info *rqi = NULL; + struct snic_tgt_id *tgtid; + int i, ret = 0; + + snic_io_hdr_dec(&fwreq->hdr, &typ, &cmpl_stat, &cmnd_id, &hid, &ctx); + rqi = (struct snic_req_info *) ctx; + tgtid = (struct snic_tgt_id *) rqi->sge_va; + + tgt_cnt = le32_to_cpu(fwreq->u.rpt_tgts_cmpl.tgt_cnt); + if (tgt_cnt == 0) { + SNIC_HOST_ERR(snic->shost, "No Targets Found on this host.\n"); + ret = 1; + + goto end; + } + + /* printing list of targets here */ + SNIC_HOST_INFO(snic->shost, "Target Count = %d\n", tgt_cnt); + + SNIC_BUG_ON(tgt_cnt > snic->fwinfo.max_tgts); + + for (i = 0; i < tgt_cnt; i++) + SNIC_HOST_INFO(snic->shost, + "Tgt id = 0x%x\n", + le32_to_cpu(tgtid[i].tgt_id)); + + /* + * Queue work for further processing, + * Response Buffer Memory is freed after creating targets + */ + snic->disc.rtgt_cnt = tgt_cnt; + snic->disc.rtgt_info = (u8 *) tgtid; + queue_work(snic_glob->event_q, &snic->tgt_work); + ret = 0; + +end: + /* Unmap Response Buffer */ + snic_pci_unmap_rsp_buf(snic, rqi); + if (ret) + kfree(tgtid); + + rqi->sge_va = 0; + snic_release_untagged_req(snic, rqi); + + return ret; +} /* end of snic_report_tgt_cmpl_handler */ + +/* Discovery init fn */ +void +snic_disc_init(struct snic_disc *disc) +{ + INIT_LIST_HEAD(&disc->tgt_list); + mutex_init(&disc->mutex); + disc->disc_id = 0; + disc->nxt_tgt_id = 0; + disc->state = SNIC_DISC_INIT; + disc->req_cnt = 0; + disc->rtgt_cnt = 0; + disc->rtgt_info = NULL; + disc->cb = NULL; +} /* end of snic_disc_init */ + +/* Discovery, uninit fn */ +void +snic_disc_term(struct snic *snic) +{ + struct snic_disc *disc = &snic->disc; + + mutex_lock(&disc->mutex); + if (disc->req_cnt) { + disc->req_cnt = 0; + SNIC_SCSI_DBG(snic->shost, "Terminating Discovery.\n"); + } + mutex_unlock(&disc->mutex); +} + +/* + * snic_disc_start: Discovery Start ... + */ +int +snic_disc_start(struct snic *snic) +{ + struct snic_disc *disc = &snic->disc; + unsigned long flags; + int ret = 0; + + SNIC_SCSI_DBG(snic->shost, "Discovery Start.\n"); + + spin_lock_irqsave(&snic->snic_lock, flags); + if (snic->in_remove) { + spin_unlock_irqrestore(&snic->snic_lock, flags); + SNIC_ERR("snic driver removal in progress ...\n"); + ret = 0; + + return ret; + } + spin_unlock_irqrestore(&snic->snic_lock, flags); + + mutex_lock(&disc->mutex); + if (disc->state == SNIC_DISC_PENDING) { + disc->req_cnt++; + mutex_unlock(&disc->mutex); + + return ret; + } + disc->state = SNIC_DISC_PENDING; + mutex_unlock(&disc->mutex); + + ret = snic_queue_report_tgt_req(snic); + if (ret) + SNIC_HOST_INFO(snic->shost, "Discovery Failed, err=%d.\n", ret); + + return ret; +} /* end of snic_disc_start */ + +/* + * snic_disc_work : + */ +void +snic_handle_disc(struct work_struct *work) +{ + struct snic *snic = container_of(work, struct snic, disc_work); + int ret = 0; + + SNIC_HOST_INFO(snic->shost, "disc_work: Discovery\n"); + + ret = snic_disc_start(snic); + if (ret) + goto disc_err; + +disc_err: + SNIC_HOST_ERR(snic->shost, + "disc_work: Discovery Failed w/ err = %d\n", + ret); +} /* end of snic_disc_work */ + +/* + * snic_tgt_del_all : cleanup all snic targets + * Called on unbinding the interface + */ +void +snic_tgt_del_all(struct snic *snic) +{ + struct snic_tgt *tgt = NULL; + struct list_head *cur, *nxt; + unsigned long flags; + + scsi_flush_work(snic->shost); + + mutex_lock(&snic->disc.mutex); + spin_lock_irqsave(snic->shost->host_lock, flags); + + list_for_each_safe(cur, nxt, &snic->disc.tgt_list) { + tgt = list_entry(cur, struct snic_tgt, list); + tgt->state = SNIC_TGT_STAT_DEL; + list_del_init(&tgt->list); + SNIC_HOST_INFO(snic->shost, "Tgt %d q'ing for del\n", tgt->id); + queue_work(snic_glob->event_q, &tgt->del_work); + tgt = NULL; + } + spin_unlock_irqrestore(snic->shost->host_lock, flags); + mutex_unlock(&snic->disc.mutex); + + flush_workqueue(snic_glob->event_q); +} /* end of snic_tgt_del_all */ |