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- // SPDX-License-Identifier: GPL-2.0-or-later
- /*******************************************************************************
- * Filename: target_core_pscsi.c
- *
- * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
- *
- * (c) Copyright 2003-2013 Datera, Inc.
- *
- * Nicholas A. Bellinger <nab@kernel.org>
- *
- ******************************************************************************/
- #include <linux/string.h>
- #include <linux/parser.h>
- #include <linux/timer.h>
- #include <linux/blkdev.h>
- #include <linux/blk_types.h>
- #include <linux/slab.h>
- #include <linux/spinlock.h>
- #include <linux/genhd.h>
- #include <linux/cdrom.h>
- #include <linux/ratelimit.h>
- #include <linux/module.h>
- #include <asm/unaligned.h>
- #include <scsi/scsi_device.h>
- #include <scsi/scsi_host.h>
- #include <scsi/scsi_tcq.h>
- #include <target/target_core_base.h>
- #include <target/target_core_backend.h>
- #include "target_core_alua.h"
- #include "target_core_internal.h"
- #include "target_core_pscsi.h"
- #define ISPRINT(a) ((a >= ' ') && (a <= '~'))
- static inline struct pscsi_dev_virt *PSCSI_DEV(struct se_device *dev)
- {
- return container_of(dev, struct pscsi_dev_virt, dev);
- }
- static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
- static void pscsi_req_done(struct request *, blk_status_t);
- /* pscsi_attach_hba():
- *
- * pscsi_get_sh() used scsi_host_lookup() to locate struct Scsi_Host.
- * from the passed SCSI Host ID.
- */
- static int pscsi_attach_hba(struct se_hba *hba, u32 host_id)
- {
- struct pscsi_hba_virt *phv;
- phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
- if (!phv) {
- pr_err("Unable to allocate struct pscsi_hba_virt\n");
- return -ENOMEM;
- }
- phv->phv_host_id = host_id;
- phv->phv_mode = PHV_VIRTUAL_HOST_ID;
- hba->hba_ptr = phv;
- pr_debug("CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
- " Generic Target Core Stack %s\n", hba->hba_id,
- PSCSI_VERSION, TARGET_CORE_VERSION);
- pr_debug("CORE_HBA[%d] - Attached SCSI HBA to Generic\n",
- hba->hba_id);
- return 0;
- }
- static void pscsi_detach_hba(struct se_hba *hba)
- {
- struct pscsi_hba_virt *phv = hba->hba_ptr;
- struct Scsi_Host *scsi_host = phv->phv_lld_host;
- if (scsi_host) {
- scsi_host_put(scsi_host);
- pr_debug("CORE_HBA[%d] - Detached SCSI HBA: %s from"
- " Generic Target Core\n", hba->hba_id,
- (scsi_host->hostt->name) ? (scsi_host->hostt->name) :
- "Unknown");
- } else
- pr_debug("CORE_HBA[%d] - Detached Virtual SCSI HBA"
- " from Generic Target Core\n", hba->hba_id);
- kfree(phv);
- hba->hba_ptr = NULL;
- }
- static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
- {
- struct pscsi_hba_virt *phv = hba->hba_ptr;
- struct Scsi_Host *sh = phv->phv_lld_host;
- /*
- * Release the struct Scsi_Host
- */
- if (!mode_flag) {
- if (!sh)
- return 0;
- phv->phv_lld_host = NULL;
- phv->phv_mode = PHV_VIRTUAL_HOST_ID;
- pr_debug("CORE_HBA[%d] - Disabled pSCSI HBA Passthrough"
- " %s\n", hba->hba_id, (sh->hostt->name) ?
- (sh->hostt->name) : "Unknown");
- scsi_host_put(sh);
- return 0;
- }
- /*
- * Otherwise, locate struct Scsi_Host from the original passed
- * pSCSI Host ID and enable for phba mode
- */
- sh = scsi_host_lookup(phv->phv_host_id);
- if (!sh) {
- pr_err("pSCSI: Unable to locate SCSI Host for"
- " phv_host_id: %d\n", phv->phv_host_id);
- return -EINVAL;
- }
- phv->phv_lld_host = sh;
- phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
- pr_debug("CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
- hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
- return 1;
- }
- static void pscsi_tape_read_blocksize(struct se_device *dev,
- struct scsi_device *sdev)
- {
- unsigned char cdb[MAX_COMMAND_SIZE], *buf;
- int ret;
- buf = kzalloc(12, GFP_KERNEL);
- if (!buf)
- goto out_free;
- memset(cdb, 0, MAX_COMMAND_SIZE);
- cdb[0] = MODE_SENSE;
- cdb[4] = 0x0c; /* 12 bytes */
- ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf, 12, NULL,
- HZ, 1, NULL);
- if (ret)
- goto out_free;
- /*
- * If MODE_SENSE still returns zero, set the default value to 1024.
- */
- sdev->sector_size = get_unaligned_be24(&buf[9]);
- out_free:
- if (!sdev->sector_size)
- sdev->sector_size = 1024;
- kfree(buf);
- }
- static void
- pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
- {
- if (sdev->inquiry_len < INQUIRY_LEN)
- return;
- /*
- * Use sdev->inquiry data from drivers/scsi/scsi_scan.c:scsi_add_lun()
- */
- BUILD_BUG_ON(sizeof(wwn->vendor) != INQUIRY_VENDOR_LEN + 1);
- snprintf(wwn->vendor, sizeof(wwn->vendor),
- "%." __stringify(INQUIRY_VENDOR_LEN) "s", sdev->vendor);
- BUILD_BUG_ON(sizeof(wwn->model) != INQUIRY_MODEL_LEN + 1);
- snprintf(wwn->model, sizeof(wwn->model),
- "%." __stringify(INQUIRY_MODEL_LEN) "s", sdev->model);
- BUILD_BUG_ON(sizeof(wwn->revision) != INQUIRY_REVISION_LEN + 1);
- snprintf(wwn->revision, sizeof(wwn->revision),
- "%." __stringify(INQUIRY_REVISION_LEN) "s", sdev->rev);
- }
- static int
- pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
- {
- unsigned char cdb[MAX_COMMAND_SIZE], *buf;
- int ret;
- buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
- memset(cdb, 0, MAX_COMMAND_SIZE);
- cdb[0] = INQUIRY;
- cdb[1] = 0x01; /* Query VPD */
- cdb[2] = 0x80; /* Unit Serial Number */
- put_unaligned_be16(INQUIRY_VPD_SERIAL_LEN, &cdb[3]);
- ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
- INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
- if (ret)
- goto out_free;
- snprintf(&wwn->unit_serial[0], INQUIRY_VPD_SERIAL_LEN, "%s", &buf[4]);
- wwn->t10_dev->dev_flags |= DF_FIRMWARE_VPD_UNIT_SERIAL;
- kfree(buf);
- return 0;
- out_free:
- kfree(buf);
- return -EPERM;
- }
- static void
- pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
- struct t10_wwn *wwn)
- {
- unsigned char cdb[MAX_COMMAND_SIZE], *buf, *page_83;
- int ident_len, page_len, off = 4, ret;
- struct t10_vpd *vpd;
- buf = kzalloc(INQUIRY_VPD_SERIAL_LEN, GFP_KERNEL);
- if (!buf)
- return;
- memset(cdb, 0, MAX_COMMAND_SIZE);
- cdb[0] = INQUIRY;
- cdb[1] = 0x01; /* Query VPD */
- cdb[2] = 0x83; /* Device Identifier */
- put_unaligned_be16(INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, &cdb[3]);
- ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
- INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
- NULL, HZ, 1, NULL);
- if (ret)
- goto out;
- page_len = get_unaligned_be16(&buf[2]);
- while (page_len > 0) {
- /* Grab a pointer to the Identification descriptor */
- page_83 = &buf[off];
- ident_len = page_83[3];
- if (!ident_len) {
- pr_err("page_83[3]: identifier"
- " length zero!\n");
- break;
- }
- pr_debug("T10 VPD Identifier Length: %d\n", ident_len);
- vpd = kzalloc(sizeof(struct t10_vpd), GFP_KERNEL);
- if (!vpd) {
- pr_err("Unable to allocate memory for"
- " struct t10_vpd\n");
- goto out;
- }
- INIT_LIST_HEAD(&vpd->vpd_list);
- transport_set_vpd_proto_id(vpd, page_83);
- transport_set_vpd_assoc(vpd, page_83);
- if (transport_set_vpd_ident_type(vpd, page_83) < 0) {
- off += (ident_len + 4);
- page_len -= (ident_len + 4);
- kfree(vpd);
- continue;
- }
- if (transport_set_vpd_ident(vpd, page_83) < 0) {
- off += (ident_len + 4);
- page_len -= (ident_len + 4);
- kfree(vpd);
- continue;
- }
- list_add_tail(&vpd->vpd_list, &wwn->t10_vpd_list);
- off += (ident_len + 4);
- page_len -= (ident_len + 4);
- }
- out:
- kfree(buf);
- }
- static int pscsi_add_device_to_list(struct se_device *dev,
- struct scsi_device *sd)
- {
- struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
- struct request_queue *q = sd->request_queue;
- pdv->pdv_sd = sd;
- if (!sd->queue_depth) {
- sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
- pr_err("Set broken SCSI Device %d:%d:%llu"
- " queue_depth to %d\n", sd->channel, sd->id,
- sd->lun, sd->queue_depth);
- }
- dev->dev_attrib.hw_block_size =
- min_not_zero((int)sd->sector_size, 512);
- dev->dev_attrib.hw_max_sectors =
- min_not_zero(sd->host->max_sectors, queue_max_hw_sectors(q));
- dev->dev_attrib.hw_queue_depth = sd->queue_depth;
- /*
- * Setup our standard INQUIRY info into se_dev->t10_wwn
- */
- pscsi_set_inquiry_info(sd, &dev->t10_wwn);
- /*
- * Locate VPD WWN Information used for various purposes within
- * the Storage Engine.
- */
- if (!pscsi_get_inquiry_vpd_serial(sd, &dev->t10_wwn)) {
- /*
- * If VPD Unit Serial returned GOOD status, try
- * VPD Device Identification page (0x83).
- */
- pscsi_get_inquiry_vpd_device_ident(sd, &dev->t10_wwn);
- }
- /*
- * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
- */
- if (sd->type == TYPE_TAPE) {
- pscsi_tape_read_blocksize(dev, sd);
- dev->dev_attrib.hw_block_size = sd->sector_size;
- }
- return 0;
- }
- static struct se_device *pscsi_alloc_device(struct se_hba *hba,
- const char *name)
- {
- struct pscsi_dev_virt *pdv;
- pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
- if (!pdv) {
- pr_err("Unable to allocate memory for struct pscsi_dev_virt\n");
- return NULL;
- }
- pr_debug("PSCSI: Allocated pdv: %p for %s\n", pdv, name);
- return &pdv->dev;
- }
- /*
- * Called with struct Scsi_Host->host_lock called.
- */
- static int pscsi_create_type_disk(struct se_device *dev, struct scsi_device *sd)
- __releases(sh->host_lock)
- {
- struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
- struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
- struct Scsi_Host *sh = sd->host;
- struct block_device *bd;
- int ret;
- if (scsi_device_get(sd)) {
- pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
- sh->host_no, sd->channel, sd->id, sd->lun);
- spin_unlock_irq(sh->host_lock);
- return -EIO;
- }
- spin_unlock_irq(sh->host_lock);
- /*
- * Claim exclusive struct block_device access to struct scsi_device
- * for TYPE_DISK and TYPE_ZBC using supplied udev_path
- */
- bd = blkdev_get_by_path(dev->udev_path,
- FMODE_WRITE|FMODE_READ|FMODE_EXCL, pdv);
- if (IS_ERR(bd)) {
- pr_err("pSCSI: blkdev_get_by_path() failed\n");
- scsi_device_put(sd);
- return PTR_ERR(bd);
- }
- pdv->pdv_bd = bd;
- ret = pscsi_add_device_to_list(dev, sd);
- if (ret) {
- blkdev_put(pdv->pdv_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
- scsi_device_put(sd);
- return ret;
- }
- pr_debug("CORE_PSCSI[%d] - Added TYPE_%s for %d:%d:%d:%llu\n",
- phv->phv_host_id, sd->type == TYPE_DISK ? "DISK" : "ZBC",
- sh->host_no, sd->channel, sd->id, sd->lun);
- return 0;
- }
- /*
- * Called with struct Scsi_Host->host_lock called.
- */
- static int pscsi_create_type_nondisk(struct se_device *dev, struct scsi_device *sd)
- __releases(sh->host_lock)
- {
- struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
- struct Scsi_Host *sh = sd->host;
- int ret;
- if (scsi_device_get(sd)) {
- pr_err("scsi_device_get() failed for %d:%d:%d:%llu\n",
- sh->host_no, sd->channel, sd->id, sd->lun);
- spin_unlock_irq(sh->host_lock);
- return -EIO;
- }
- spin_unlock_irq(sh->host_lock);
- ret = pscsi_add_device_to_list(dev, sd);
- if (ret) {
- scsi_device_put(sd);
- return ret;
- }
- pr_debug("CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%llu\n",
- phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
- sd->channel, sd->id, sd->lun);
- return 0;
- }
- static int pscsi_configure_device(struct se_device *dev)
- {
- struct se_hba *hba = dev->se_hba;
- struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
- struct scsi_device *sd;
- struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
- struct Scsi_Host *sh = phv->phv_lld_host;
- int legacy_mode_enable = 0;
- int ret;
- if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
- !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
- !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
- pr_err("Missing scsi_channel_id=, scsi_target_id= and"
- " scsi_lun_id= parameters\n");
- return -EINVAL;
- }
- /*
- * If not running in PHV_LLD_SCSI_HOST_NO mode, locate the
- * struct Scsi_Host we will need to bring the TCM/pSCSI object online
- */
- if (!sh) {
- if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
- pr_err("pSCSI: Unable to locate struct"
- " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
- return -ENODEV;
- }
- /*
- * For the newer PHV_VIRTUAL_HOST_ID struct scsi_device
- * reference, we enforce that udev_path has been set
- */
- if (!(dev->dev_flags & DF_USING_UDEV_PATH)) {
- pr_err("pSCSI: udev_path attribute has not"
- " been set before ENABLE=1\n");
- return -EINVAL;
- }
- /*
- * If no scsi_host_id= was passed for PHV_VIRTUAL_HOST_ID,
- * use the original TCM hba ID to reference Linux/SCSI Host No
- * and enable for PHV_LLD_SCSI_HOST_NO mode.
- */
- if (!(pdv->pdv_flags & PDF_HAS_VIRT_HOST_ID)) {
- if (hba->dev_count) {
- pr_err("pSCSI: Unable to set hba_mode"
- " with active devices\n");
- return -EEXIST;
- }
- if (pscsi_pmode_enable_hba(hba, 1) != 1)
- return -ENODEV;
- legacy_mode_enable = 1;
- hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
- sh = phv->phv_lld_host;
- } else {
- sh = scsi_host_lookup(pdv->pdv_host_id);
- if (!sh) {
- pr_err("pSCSI: Unable to locate"
- " pdv_host_id: %d\n", pdv->pdv_host_id);
- return -EINVAL;
- }
- pdv->pdv_lld_host = sh;
- }
- } else {
- if (phv->phv_mode == PHV_VIRTUAL_HOST_ID) {
- pr_err("pSCSI: PHV_VIRTUAL_HOST_ID set while"
- " struct Scsi_Host exists\n");
- return -EEXIST;
- }
- }
- spin_lock_irq(sh->host_lock);
- list_for_each_entry(sd, &sh->__devices, siblings) {
- if ((pdv->pdv_channel_id != sd->channel) ||
- (pdv->pdv_target_id != sd->id) ||
- (pdv->pdv_lun_id != sd->lun))
- continue;
- /*
- * Functions will release the held struct scsi_host->host_lock
- * before calling calling pscsi_add_device_to_list() to register
- * struct scsi_device with target_core_mod.
- */
- switch (sd->type) {
- case TYPE_DISK:
- case TYPE_ZBC:
- ret = pscsi_create_type_disk(dev, sd);
- break;
- default:
- ret = pscsi_create_type_nondisk(dev, sd);
- break;
- }
- if (ret) {
- if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
- scsi_host_put(sh);
- else if (legacy_mode_enable) {
- pscsi_pmode_enable_hba(hba, 0);
- hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
- }
- pdv->pdv_sd = NULL;
- return ret;
- }
- return 0;
- }
- spin_unlock_irq(sh->host_lock);
- pr_err("pSCSI: Unable to locate %d:%d:%d:%d\n", sh->host_no,
- pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id);
- if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
- scsi_host_put(sh);
- else if (legacy_mode_enable) {
- pscsi_pmode_enable_hba(hba, 0);
- hba->hba_flags &= ~HBA_FLAGS_PSCSI_MODE;
- }
- return -ENODEV;
- }
- static void pscsi_dev_call_rcu(struct rcu_head *p)
- {
- struct se_device *dev = container_of(p, struct se_device, rcu_head);
- struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
- kfree(pdv);
- }
- static void pscsi_free_device(struct se_device *dev)
- {
- call_rcu(&dev->rcu_head, pscsi_dev_call_rcu);
- }
- static void pscsi_destroy_device(struct se_device *dev)
- {
- struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
- struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
- struct scsi_device *sd = pdv->pdv_sd;
- if (sd) {
- /*
- * Release exclusive pSCSI internal struct block_device claim for
- * struct scsi_device with TYPE_DISK or TYPE_ZBC
- * from pscsi_create_type_disk()
- */
- if ((sd->type == TYPE_DISK || sd->type == TYPE_ZBC) &&
- pdv->pdv_bd) {
- blkdev_put(pdv->pdv_bd,
- FMODE_WRITE|FMODE_READ|FMODE_EXCL);
- pdv->pdv_bd = NULL;
- }
- /*
- * For HBA mode PHV_LLD_SCSI_HOST_NO, release the reference
- * to struct Scsi_Host now.
- */
- if ((phv->phv_mode == PHV_LLD_SCSI_HOST_NO) &&
- (phv->phv_lld_host != NULL))
- scsi_host_put(phv->phv_lld_host);
- else if (pdv->pdv_lld_host)
- scsi_host_put(pdv->pdv_lld_host);
- scsi_device_put(sd);
- pdv->pdv_sd = NULL;
- }
- }
- static void pscsi_complete_cmd(struct se_cmd *cmd, u8 scsi_status,
- unsigned char *req_sense)
- {
- struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
- struct scsi_device *sd = pdv->pdv_sd;
- struct pscsi_plugin_task *pt = cmd->priv;
- unsigned char *cdb;
- /*
- * Special case for REPORT_LUNs handling where pscsi_plugin_task has
- * not been allocated because TCM is handling the emulation directly.
- */
- if (!pt)
- return;
- cdb = &pt->pscsi_cdb[0];
- /*
- * Hack to make sure that Write-Protect modepage is set if R/O mode is
- * forced.
- */
- if (!cmd->data_length)
- goto after_mode_sense;
- if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
- scsi_status == SAM_STAT_GOOD) {
- bool read_only = target_lun_is_rdonly(cmd);
- if (read_only) {
- unsigned char *buf;
- buf = transport_kmap_data_sg(cmd);
- if (!buf) {
- ; /* XXX: TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE */
- }
- if (cdb[0] == MODE_SENSE_10) {
- if (!(buf[3] & 0x80))
- buf[3] |= 0x80;
- } else {
- if (!(buf[2] & 0x80))
- buf[2] |= 0x80;
- }
- transport_kunmap_data_sg(cmd);
- }
- }
- after_mode_sense:
- if (sd->type != TYPE_TAPE || !cmd->data_length)
- goto after_mode_select;
- /*
- * Hack to correctly obtain the initiator requested blocksize for
- * TYPE_TAPE. Since this value is dependent upon each tape media,
- * struct scsi_device->sector_size will not contain the correct value
- * by default, so we go ahead and set it so
- * TRANSPORT(dev)->get_blockdev() returns the correct value to the
- * storage engine.
- */
- if (((cdb[0] == MODE_SELECT) || (cdb[0] == MODE_SELECT_10)) &&
- scsi_status == SAM_STAT_GOOD) {
- unsigned char *buf;
- u16 bdl;
- u32 blocksize;
- buf = sg_virt(&cmd->t_data_sg[0]);
- if (!buf) {
- pr_err("Unable to get buf for scatterlist\n");
- goto after_mode_select;
- }
- if (cdb[0] == MODE_SELECT)
- bdl = buf[3];
- else
- bdl = get_unaligned_be16(&buf[6]);
- if (!bdl)
- goto after_mode_select;
- if (cdb[0] == MODE_SELECT)
- blocksize = get_unaligned_be24(&buf[9]);
- else
- blocksize = get_unaligned_be24(&buf[13]);
- sd->sector_size = blocksize;
- }
- after_mode_select:
- if (scsi_status == SAM_STAT_CHECK_CONDITION) {
- transport_copy_sense_to_cmd(cmd, req_sense);
- /*
- * check for TAPE device reads with
- * FM/EOM/ILI set, so that we can get data
- * back despite framework assumption that a
- * check condition means there is no data
- */
- if (sd->type == TYPE_TAPE &&
- cmd->data_direction == DMA_FROM_DEVICE) {
- /*
- * is sense data valid, fixed format,
- * and have FM, EOM, or ILI set?
- */
- if (req_sense[0] == 0xf0 && /* valid, fixed format */
- req_sense[2] & 0xe0 && /* FM, EOM, or ILI */
- (req_sense[2] & 0xf) == 0) { /* key==NO_SENSE */
- pr_debug("Tape FM/EOM/ILI status detected. Treat as normal read.\n");
- cmd->se_cmd_flags |= SCF_TREAT_READ_AS_NORMAL;
- }
- }
- }
- }
- enum {
- Opt_scsi_host_id, Opt_scsi_channel_id, Opt_scsi_target_id,
- Opt_scsi_lun_id, Opt_err
- };
- static match_table_t tokens = {
- {Opt_scsi_host_id, "scsi_host_id=%d"},
- {Opt_scsi_channel_id, "scsi_channel_id=%d"},
- {Opt_scsi_target_id, "scsi_target_id=%d"},
- {Opt_scsi_lun_id, "scsi_lun_id=%d"},
- {Opt_err, NULL}
- };
- static ssize_t pscsi_set_configfs_dev_params(struct se_device *dev,
- const char *page, ssize_t count)
- {
- struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
- struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
- char *orig, *ptr, *opts;
- substring_t args[MAX_OPT_ARGS];
- int ret = 0, arg, token;
- opts = kstrdup(page, GFP_KERNEL);
- if (!opts)
- return -ENOMEM;
- orig = opts;
- while ((ptr = strsep(&opts, ",\n")) != NULL) {
- if (!*ptr)
- continue;
- token = match_token(ptr, tokens, args);
- switch (token) {
- case Opt_scsi_host_id:
- if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
- pr_err("PSCSI[%d]: Unable to accept"
- " scsi_host_id while phv_mode =="
- " PHV_LLD_SCSI_HOST_NO\n",
- phv->phv_host_id);
- ret = -EINVAL;
- goto out;
- }
- ret = match_int(args, &arg);
- if (ret)
- goto out;
- pdv->pdv_host_id = arg;
- pr_debug("PSCSI[%d]: Referencing SCSI Host ID:"
- " %d\n", phv->phv_host_id, pdv->pdv_host_id);
- pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
- break;
- case Opt_scsi_channel_id:
- ret = match_int(args, &arg);
- if (ret)
- goto out;
- pdv->pdv_channel_id = arg;
- pr_debug("PSCSI[%d]: Referencing SCSI Channel"
- " ID: %d\n", phv->phv_host_id,
- pdv->pdv_channel_id);
- pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
- break;
- case Opt_scsi_target_id:
- ret = match_int(args, &arg);
- if (ret)
- goto out;
- pdv->pdv_target_id = arg;
- pr_debug("PSCSI[%d]: Referencing SCSI Target"
- " ID: %d\n", phv->phv_host_id,
- pdv->pdv_target_id);
- pdv->pdv_flags |= PDF_HAS_TARGET_ID;
- break;
- case Opt_scsi_lun_id:
- ret = match_int(args, &arg);
- if (ret)
- goto out;
- pdv->pdv_lun_id = arg;
- pr_debug("PSCSI[%d]: Referencing SCSI LUN ID:"
- " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
- pdv->pdv_flags |= PDF_HAS_LUN_ID;
- break;
- default:
- break;
- }
- }
- out:
- kfree(orig);
- return (!ret) ? count : ret;
- }
- static ssize_t pscsi_show_configfs_dev_params(struct se_device *dev, char *b)
- {
- struct pscsi_hba_virt *phv = dev->se_hba->hba_ptr;
- struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
- struct scsi_device *sd = pdv->pdv_sd;
- unsigned char host_id[16];
- ssize_t bl;
- if (phv->phv_mode == PHV_VIRTUAL_HOST_ID)
- snprintf(host_id, 16, "%d", pdv->pdv_host_id);
- else
- snprintf(host_id, 16, "PHBA Mode");
- bl = sprintf(b, "SCSI Device Bus Location:"
- " Channel ID: %d Target ID: %d LUN: %d Host ID: %s\n",
- pdv->pdv_channel_id, pdv->pdv_target_id, pdv->pdv_lun_id,
- host_id);
- if (sd) {
- bl += sprintf(b + bl, " Vendor: %."
- __stringify(INQUIRY_VENDOR_LEN) "s", sd->vendor);
- bl += sprintf(b + bl, " Model: %."
- __stringify(INQUIRY_MODEL_LEN) "s", sd->model);
- bl += sprintf(b + bl, " Rev: %."
- __stringify(INQUIRY_REVISION_LEN) "s\n", sd->rev);
- }
- return bl;
- }
- static void pscsi_bi_endio(struct bio *bio)
- {
- bio_put(bio);
- }
- static inline struct bio *pscsi_get_bio(int nr_vecs)
- {
- struct bio *bio;
- /*
- * Use bio_malloc() following the comment in for bio -> struct request
- * in block/blk-core.c:blk_make_request()
- */
- bio = bio_kmalloc(GFP_KERNEL, nr_vecs);
- if (!bio) {
- pr_err("PSCSI: bio_kmalloc() failed\n");
- return NULL;
- }
- bio->bi_end_io = pscsi_bi_endio;
- return bio;
- }
- static sense_reason_t
- pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
- struct request *req)
- {
- struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
- struct bio *bio = NULL;
- struct page *page;
- struct scatterlist *sg;
- u32 data_len = cmd->data_length, i, len, bytes, off;
- int nr_pages = (cmd->data_length + sgl[0].offset +
- PAGE_SIZE - 1) >> PAGE_SHIFT;
- int nr_vecs = 0, rc;
- int rw = (cmd->data_direction == DMA_TO_DEVICE);
- BUG_ON(!cmd->data_length);
- pr_debug("PSCSI: nr_pages: %d\n", nr_pages);
- for_each_sg(sgl, sg, sgl_nents, i) {
- page = sg_page(sg);
- off = sg->offset;
- len = sg->length;
- pr_debug("PSCSI: i: %d page: %p len: %d off: %d\n", i,
- page, len, off);
- /*
- * We only have one page of data in each sg element,
- * we can not cross a page boundary.
- */
- if (off + len > PAGE_SIZE)
- goto fail;
- if (len > 0 && data_len > 0) {
- bytes = min_t(unsigned int, len, PAGE_SIZE - off);
- bytes = min(bytes, data_len);
- if (!bio) {
- new_bio:
- nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
- nr_pages -= nr_vecs;
- /*
- * Calls bio_kmalloc() and sets bio->bi_end_io()
- */
- bio = pscsi_get_bio(nr_vecs);
- if (!bio)
- goto fail;
- if (rw)
- bio_set_op_attrs(bio, REQ_OP_WRITE, 0);
- pr_debug("PSCSI: Allocated bio: %p,"
- " dir: %s nr_vecs: %d\n", bio,
- (rw) ? "rw" : "r", nr_vecs);
- }
- pr_debug("PSCSI: Calling bio_add_pc_page() i: %d"
- " bio: %p page: %p len: %d off: %d\n", i, bio,
- page, len, off);
- rc = bio_add_pc_page(pdv->pdv_sd->request_queue,
- bio, page, bytes, off);
- pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
- bio_segments(bio), nr_vecs);
- if (rc != bytes) {
- pr_debug("PSCSI: Reached bio->bi_vcnt max:"
- " %d i: %d bio: %p, allocating another"
- " bio\n", bio->bi_vcnt, i, bio);
- rc = blk_rq_append_bio(req, &bio);
- if (rc) {
- pr_err("pSCSI: failed to append bio\n");
- goto fail;
- }
- /*
- * Clear the pointer so that another bio will
- * be allocated with pscsi_get_bio() above.
- */
- bio = NULL;
- goto new_bio;
- }
- data_len -= bytes;
- }
- }
- if (bio) {
- rc = blk_rq_append_bio(req, &bio);
- if (rc) {
- pr_err("pSCSI: failed to append bio\n");
- goto fail;
- }
- }
- return 0;
- fail:
- if (bio)
- bio_put(bio);
- while (req->bio) {
- bio = req->bio;
- req->bio = bio->bi_next;
- bio_put(bio);
- }
- req->biotail = NULL;
- return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- }
- static sense_reason_t
- pscsi_parse_cdb(struct se_cmd *cmd)
- {
- if (cmd->se_cmd_flags & SCF_BIDI)
- return TCM_UNSUPPORTED_SCSI_OPCODE;
- return passthrough_parse_cdb(cmd, pscsi_execute_cmd);
- }
- static sense_reason_t
- pscsi_execute_cmd(struct se_cmd *cmd)
- {
- struct scatterlist *sgl = cmd->t_data_sg;
- u32 sgl_nents = cmd->t_data_nents;
- struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
- struct pscsi_plugin_task *pt;
- struct request *req;
- sense_reason_t ret;
- /*
- * Dynamically alloc cdb space, since it may be larger than
- * TCM_MAX_COMMAND_SIZE
- */
- pt = kzalloc(sizeof(*pt) + scsi_command_size(cmd->t_task_cdb), GFP_KERNEL);
- if (!pt) {
- return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- }
- cmd->priv = pt;
- memcpy(pt->pscsi_cdb, cmd->t_task_cdb,
- scsi_command_size(cmd->t_task_cdb));
- req = blk_get_request(pdv->pdv_sd->request_queue,
- cmd->data_direction == DMA_TO_DEVICE ?
- REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
- if (IS_ERR(req)) {
- pr_err("PSCSI: blk_get_request() failed\n");
- ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
- goto fail;
- }
- if (sgl) {
- ret = pscsi_map_sg(cmd, sgl, sgl_nents, req);
- if (ret)
- goto fail_put_request;
- }
- req->end_io = pscsi_req_done;
- req->end_io_data = cmd;
- scsi_req(req)->cmd_len = scsi_command_size(pt->pscsi_cdb);
- scsi_req(req)->cmd = &pt->pscsi_cdb[0];
- if (pdv->pdv_sd->type == TYPE_DISK ||
- pdv->pdv_sd->type == TYPE_ZBC)
- req->timeout = PS_TIMEOUT_DISK;
- else
- req->timeout = PS_TIMEOUT_OTHER;
- scsi_req(req)->retries = PS_RETRY;
- blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL, req,
- (cmd->sam_task_attr == TCM_HEAD_TAG),
- pscsi_req_done);
- return 0;
- fail_put_request:
- blk_put_request(req);
- fail:
- kfree(pt);
- return ret;
- }
- /* pscsi_get_device_type():
- *
- *
- */
- static u32 pscsi_get_device_type(struct se_device *dev)
- {
- struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
- struct scsi_device *sd = pdv->pdv_sd;
- return (sd) ? sd->type : TYPE_NO_LUN;
- }
- static sector_t pscsi_get_blocks(struct se_device *dev)
- {
- struct pscsi_dev_virt *pdv = PSCSI_DEV(dev);
- if (pdv->pdv_bd && pdv->pdv_bd->bd_part)
- return pdv->pdv_bd->bd_part->nr_sects;
- return 0;
- }
- static void pscsi_req_done(struct request *req, blk_status_t status)
- {
- struct se_cmd *cmd = req->end_io_data;
- struct pscsi_plugin_task *pt = cmd->priv;
- int result = scsi_req(req)->result;
- u8 scsi_status = status_byte(result) << 1;
- if (scsi_status) {
- pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
- " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
- result);
- }
- pscsi_complete_cmd(cmd, scsi_status, scsi_req(req)->sense);
- switch (host_byte(result)) {
- case DID_OK:
- target_complete_cmd_with_length(cmd, scsi_status,
- cmd->data_length - scsi_req(req)->resid_len);
- break;
- default:
- pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
- " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
- result);
- target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
- break;
- }
- blk_put_request(req);
- kfree(pt);
- }
- static const struct target_backend_ops pscsi_ops = {
- .name = "pscsi",
- .owner = THIS_MODULE,
- .transport_flags_default = TRANSPORT_FLAG_PASSTHROUGH |
- TRANSPORT_FLAG_PASSTHROUGH_ALUA |
- TRANSPORT_FLAG_PASSTHROUGH_PGR,
- .attach_hba = pscsi_attach_hba,
- .detach_hba = pscsi_detach_hba,
- .pmode_enable_hba = pscsi_pmode_enable_hba,
- .alloc_device = pscsi_alloc_device,
- .configure_device = pscsi_configure_device,
- .destroy_device = pscsi_destroy_device,
- .free_device = pscsi_free_device,
- .parse_cdb = pscsi_parse_cdb,
- .set_configfs_dev_params = pscsi_set_configfs_dev_params,
- .show_configfs_dev_params = pscsi_show_configfs_dev_params,
- .get_device_type = pscsi_get_device_type,
- .get_blocks = pscsi_get_blocks,
- .tb_dev_attrib_attrs = passthrough_attrib_attrs,
- };
- static int __init pscsi_module_init(void)
- {
- return transport_backend_register(&pscsi_ops);
- }
- static void __exit pscsi_module_exit(void)
- {
- target_backend_unregister(&pscsi_ops);
- }
- MODULE_DESCRIPTION("TCM PSCSI subsystem plugin");
- MODULE_AUTHOR("nab@Linux-iSCSI.org");
- MODULE_LICENSE("GPL");
- module_init(pscsi_module_init);
- module_exit(pscsi_module_exit);
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