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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/target/target_core_pscsi.c
Initial import
Diffstat (limited to 'drivers/target/target_core_pscsi.c')
-rw-r--r--drivers/target/target_core_pscsi.c1179
1 files changed, 1179 insertions, 0 deletions
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
new file mode 100644
index 000000000..ecc5eaef1
--- /dev/null
+++ b/drivers/target/target_core_pscsi.c
@@ -0,0 +1,1179 @@
+/*******************************************************************************
+ * 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>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ ******************************************************************************/
+
+#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.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.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/target_core_backend_configfs.h>
+
+#include "target_core_alua.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 struct se_subsystem_api pscsi_template;
+
+static sense_reason_t pscsi_execute_cmd(struct se_cmd *cmd);
+static void pscsi_req_done(struct request *, int);
+
+/* 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_MOD_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)
+ return;
+
+ 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 = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
+ if (!sdev->sector_size)
+ sdev->sector_size = 1024;
+out_free:
+ kfree(buf);
+}
+
+static void
+pscsi_set_inquiry_info(struct scsi_device *sdev, struct t10_wwn *wwn)
+{
+ unsigned char *buf;
+
+ if (sdev->inquiry_len < INQUIRY_LEN)
+ return;
+
+ buf = sdev->inquiry;
+ if (!buf)
+ return;
+ /*
+ * Use sdev->inquiry from drivers/scsi/scsi_scan.c:scsi_alloc_sdev()
+ */
+ memcpy(&wwn->vendor[0], &buf[8], sizeof(wwn->vendor));
+ memcpy(&wwn->model[0], &buf[16], sizeof(wwn->model));
+ memcpy(&wwn->revision[0], &buf[32], sizeof(wwn->revision));
+}
+
+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 */
+ cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
+ cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
+
+ 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 */
+ cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
+ cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
+
+ 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 = (buf[2] << 8) | buf[3];
+ 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 = sd->sector_size;
+ dev->dev_attrib.hw_max_sectors =
+ min_t(int, 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);
+ 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 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_DISK for %d:%d:%d:%llu\n",
+ phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
+ return 0;
+}
+
+/*
+ * Called with struct Scsi_Host->host_lock called.
+ */
+static int pscsi_create_type_rom(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;
+}
+
+/*
+ * Called with struct Scsi_Host->host_lock called.
+ */
+static int pscsi_create_type_other(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;
+
+ spin_unlock_irq(sh->host_lock);
+ ret = pscsi_add_device_to_list(dev, sd);
+ if (ret)
+ 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:
+ ret = pscsi_create_type_disk(dev, sd);
+ break;
+ case TYPE_ROM:
+ ret = pscsi_create_type_rom(dev, sd);
+ break;
+ default:
+ ret = pscsi_create_type_other(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_free_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 from pscsi_create_type_disk()
+ */
+ if ((sd->type == TYPE_DISK) && 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);
+
+ if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
+ scsi_device_put(sd);
+
+ pdv->pdv_sd = NULL;
+ }
+
+ kfree(pdv);
+}
+
+static void pscsi_transport_complete(struct se_cmd *cmd, struct scatterlist *sg,
+ unsigned char *sense_buffer)
+{
+ struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
+ struct scsi_device *sd = pdv->pdv_sd;
+ int result;
+ 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];
+ result = pt->pscsi_result;
+ /*
+ * Hack to make sure that Write-Protect modepage is set if R/O mode is
+ * forced.
+ */
+ if (!cmd->se_deve || !cmd->data_length)
+ goto after_mode_sense;
+
+ if (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
+ (status_byte(result) << 1) == SAM_STAT_GOOD) {
+ if (cmd->se_deve->lun_flags & TRANSPORT_LUNFLAGS_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)) &&
+ (status_byte(result) << 1) == SAM_STAT_GOOD) {
+ unsigned char *buf;
+ u16 bdl;
+ u32 blocksize;
+
+ buf = sg_virt(&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 = (buf[6] << 8) | (buf[7]);
+
+ if (!bdl)
+ goto after_mode_select;
+
+ if (cdb[0] == MODE_SELECT)
+ blocksize = (buf[9] << 16) | (buf[10] << 8) |
+ (buf[11]);
+ else
+ blocksize = (buf[13] << 16) | (buf[14] << 8) |
+ (buf[15]);
+
+ sd->sector_size = blocksize;
+ }
+after_mode_select:
+
+ if (sense_buffer && (status_byte(result) & CHECK_CONDITION)) {
+ memcpy(sense_buffer, pt->pscsi_sense, TRANSPORT_SENSE_BUFFER);
+ cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE;
+ }
+}
+
+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;
+ int i;
+
+ 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, " ");
+ bl += sprintf(b + bl, "Vendor: ");
+ for (i = 0; i < 8; i++) {
+ if (ISPRINT(sd->vendor[i])) /* printable character? */
+ bl += sprintf(b + bl, "%c", sd->vendor[i]);
+ else
+ bl += sprintf(b + bl, " ");
+ }
+ bl += sprintf(b + bl, " Model: ");
+ for (i = 0; i < 16; i++) {
+ if (ISPRINT(sd->model[i])) /* printable character ? */
+ bl += sprintf(b + bl, "%c", sd->model[i]);
+ else
+ bl += sprintf(b + bl, " ");
+ }
+ bl += sprintf(b + bl, " Rev: ");
+ for (i = 0; i < 4; i++) {
+ if (ISPRINT(sd->rev[i])) /* printable character ? */
+ bl += sprintf(b + bl, "%c", sd->rev[i]);
+ else
+ bl += sprintf(b + bl, " ");
+ }
+ bl += sprintf(b + bl, "\n");
+ }
+ return bl;
+}
+
+static void pscsi_bi_endio(struct bio *bio, int error)
+{
+ 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,
+ enum dma_data_direction data_direction, struct bio **hbio)
+{
+ struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
+ struct bio *bio = NULL, *tbio = 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 = (data_direction == DMA_TO_DEVICE);
+
+ *hbio = NULL;
+
+ 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) {
+ 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->bi_rw |= REQ_WRITE;
+
+ pr_debug("PSCSI: Allocated bio: %p,"
+ " dir: %s nr_vecs: %d\n", bio,
+ (rw) ? "rw" : "r", nr_vecs);
+ /*
+ * Set *hbio pointer to handle the case:
+ * nr_pages > BIO_MAX_PAGES, where additional
+ * bios need to be added to complete a given
+ * command.
+ */
+ if (!*hbio)
+ *hbio = tbio = bio;
+ else
+ tbio = tbio->bi_next = bio;
+ }
+
+ 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);
+ if (rc != bytes)
+ goto fail;
+
+ pr_debug("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
+ bio->bi_vcnt, nr_vecs);
+
+ if (bio->bi_vcnt > nr_vecs) {
+ pr_debug("PSCSI: Reached bio->bi_vcnt max:"
+ " %d i: %d bio: %p, allocating another"
+ " bio\n", bio->bi_vcnt, i, bio);
+ /*
+ * Clear the pointer so that another bio will
+ * be allocated with pscsi_get_bio() above, the
+ * current bio has already been set *tbio and
+ * bio->bi_next.
+ */
+ bio = NULL;
+ }
+
+ data_len -= bytes;
+ }
+ }
+
+ return 0;
+fail:
+ while (*hbio) {
+ bio = *hbio;
+ *hbio = (*hbio)->bi_next;
+ bio_endio(bio, 0); /* XXX: should be error */
+ }
+ 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;
+ enum dma_data_direction data_direction = cmd->data_direction;
+ struct pscsi_dev_virt *pdv = PSCSI_DEV(cmd->se_dev);
+ struct pscsi_plugin_task *pt;
+ struct request *req;
+ struct bio *hbio;
+ 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));
+
+ if (!sgl) {
+ req = blk_get_request(pdv->pdv_sd->request_queue,
+ (data_direction == DMA_TO_DEVICE),
+ GFP_KERNEL);
+ if (IS_ERR(req)) {
+ pr_err("PSCSI: blk_get_request() failed\n");
+ ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ goto fail;
+ }
+
+ blk_rq_set_block_pc(req);
+ } else {
+ BUG_ON(!cmd->data_length);
+
+ ret = pscsi_map_sg(cmd, sgl, sgl_nents, data_direction, &hbio);
+ if (ret)
+ goto fail;
+
+ req = blk_make_request(pdv->pdv_sd->request_queue, hbio,
+ GFP_KERNEL);
+ if (IS_ERR(req)) {
+ pr_err("pSCSI: blk_make_request() failed\n");
+ ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ goto fail_free_bio;
+ }
+ }
+
+ req->end_io = pscsi_req_done;
+ req->end_io_data = cmd;
+ req->cmd_len = scsi_command_size(pt->pscsi_cdb);
+ req->cmd = &pt->pscsi_cdb[0];
+ req->sense = &pt->pscsi_sense[0];
+ req->sense_len = 0;
+ if (pdv->pdv_sd->type == TYPE_DISK)
+ req->timeout = PS_TIMEOUT_DISK;
+ else
+ req->timeout = PS_TIMEOUT_OTHER;
+ 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_free_bio:
+ while (hbio) {
+ struct bio *bio = hbio;
+ hbio = hbio->bi_next;
+ bio_endio(bio, 0); /* XXX: should be error */
+ }
+ ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+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;
+
+ dump_stack();
+ return 0;
+}
+
+static void pscsi_req_done(struct request *req, int uptodate)
+{
+ struct se_cmd *cmd = req->end_io_data;
+ struct pscsi_plugin_task *pt = cmd->priv;
+
+ pt->pscsi_result = req->errors;
+ pt->pscsi_resid = req->resid_len;
+
+ cmd->scsi_status = status_byte(pt->pscsi_result) << 1;
+ if (cmd->scsi_status) {
+ pr_debug("PSCSI Status Byte exception at cmd: %p CDB:"
+ " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
+ pt->pscsi_result);
+ }
+
+ switch (host_byte(pt->pscsi_result)) {
+ case DID_OK:
+ target_complete_cmd(cmd, cmd->scsi_status);
+ break;
+ default:
+ pr_debug("PSCSI Host Byte exception at cmd: %p CDB:"
+ " 0x%02x Result: 0x%08x\n", cmd, pt->pscsi_cdb[0],
+ pt->pscsi_result);
+ target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
+ break;
+ }
+
+ __blk_put_request(req->q, req);
+ kfree(pt);
+}
+
+DEF_TB_DEV_ATTRIB_RO(pscsi, hw_pi_prot_type);
+TB_DEV_ATTR_RO(pscsi, hw_pi_prot_type);
+
+DEF_TB_DEV_ATTRIB_RO(pscsi, hw_block_size);
+TB_DEV_ATTR_RO(pscsi, hw_block_size);
+
+DEF_TB_DEV_ATTRIB_RO(pscsi, hw_max_sectors);
+TB_DEV_ATTR_RO(pscsi, hw_max_sectors);
+
+DEF_TB_DEV_ATTRIB_RO(pscsi, hw_queue_depth);
+TB_DEV_ATTR_RO(pscsi, hw_queue_depth);
+
+static struct configfs_attribute *pscsi_backend_dev_attrs[] = {
+ &pscsi_dev_attrib_hw_pi_prot_type.attr,
+ &pscsi_dev_attrib_hw_block_size.attr,
+ &pscsi_dev_attrib_hw_max_sectors.attr,
+ &pscsi_dev_attrib_hw_queue_depth.attr,
+ NULL,
+};
+
+static struct se_subsystem_api pscsi_template = {
+ .name = "pscsi",
+ .owner = THIS_MODULE,
+ .transport_flags = TRANSPORT_FLAG_PASSTHROUGH,
+ .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,
+ .free_device = pscsi_free_device,
+ .transport_complete = pscsi_transport_complete,
+ .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,
+};
+
+static int __init pscsi_module_init(void)
+{
+ struct target_backend_cits *tbc = &pscsi_template.tb_cits;
+
+ target_core_setup_sub_cits(&pscsi_template);
+ tbc->tb_dev_attrib_cit.ct_attrs = pscsi_backend_dev_attrs;
+
+ return transport_subsystem_register(&pscsi_template);
+}
+
+static void __exit pscsi_module_exit(void)
+{
+ transport_subsystem_release(&pscsi_template);
+}
+
+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);