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Subject[RFC v2 16/21] tcm: Add PSCSI subsystem plugin
Date
From: Nicholas Bellinger <nab@linux-iscsi.org>

This patch adds the PSCSI subsystem plugin for accessing struct scsi_device
using struct request from upstream Linux/SCSI code. This subsystem plugin
follows a passthrough design, and does not provide and control CDB emulation
for the registered struct scsi_device backstores. This subsystem plugin also
allows the export of both TYPE_DISk and non TYPE_DISK struct scsi_devices.

Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
drivers/target/target_core_pscsi.c | 1569 ++++++++++++++++++++++++++++++++++++
drivers/target/target_core_pscsi.h | 69 ++
2 files changed, 1638 insertions(+), 0 deletions(-)
create mode 100644 drivers/target/target_core_pscsi.c
create mode 100644 drivers/target/target_core_pscsi.h

diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
new file mode 100644
index 0000000..60f825d
--- /dev/null
+++ b/drivers/target/target_core_pscsi.c
@@ -0,0 +1,1569 @@
+/*******************************************************************************
+ * Filename: target_core_pscsi.c
+ *
+ * This file contains the generic target mode <-> Linux SCSI subsystem plugin.
+ *
+ * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
+ * Copyright (c) 2005, 2006, 2007 SBE, Inc.
+ * Copyright (c) 2007-2010 Rising Tide Systems
+ * Copyright (c) 2008-2010 Linux-iSCSI.org
+ *
+ * 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/version.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/blkdev.h>
+#include <linux/blk_types.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/smp_lock.h>
+#include <linux/genhd.h>
+#include <linux/cdrom.h>
+#include <linux/file.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+
+#include <target/target_core_base.h>
+#include <target/target_core_device.h>
+#include <target/target_core_transport.h>
+
+#include "target_core_pscsi.h"
+
+#define ISPRINT(a) ((a >= ' ') && (a <= '~'))
+
+static struct se_subsystem_api pscsi_template;
+
+static void pscsi_req_done(struct request *, int);
+static void __pscsi_get_dev_info(struct pscsi_dev_virt *, char *, int *);
+
+/* pscsi_get_sh():
+ *
+ *
+ */
+static struct Scsi_Host *pscsi_get_sh(u32 host_no)
+{
+ struct Scsi_Host *sh = NULL;
+
+ sh = scsi_host_lookup(host_no);
+ if (IS_ERR(sh)) {
+ printk(KERN_ERR "Unable to locate SCSI HBA with Host ID:"
+ " %u\n", host_no);
+ return NULL;
+ }
+
+ return sh;
+}
+
+/* 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)
+{
+ int hba_depth;
+ struct pscsi_hba_virt *phv;
+
+ phv = kzalloc(sizeof(struct pscsi_hba_virt), GFP_KERNEL);
+ if (!(phv)) {
+ printk(KERN_ERR "Unable to allocate struct pscsi_hba_virt\n");
+ return -1;
+ }
+ phv->phv_host_id = host_id;
+ phv->phv_mode = PHV_VIRUTAL_HOST_ID;
+ hba_depth = PSCSI_VIRTUAL_HBA_DEPTH;
+ atomic_set(&hba->left_queue_depth, hba_depth);
+ atomic_set(&hba->max_queue_depth, hba_depth);
+
+ hba->hba_ptr = (void *)phv;
+
+ printk(KERN_INFO "CORE_HBA[%d] - TCM SCSI HBA Driver %s on"
+ " Generic Target Core Stack %s\n", hba->hba_id,
+ PSCSI_VERSION, TARGET_CORE_MOD_VERSION);
+ printk(KERN_INFO "CORE_HBA[%d] - Attached SCSI HBA to Generic"
+ " Target Core with TCQ Depth: %d\n", hba->hba_id,
+ atomic_read(&hba->max_queue_depth));
+
+ return 0;
+}
+
+/* pscsi_detach_hba(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int pscsi_detach_hba(struct se_hba *hba)
+{
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
+ struct Scsi_Host *scsi_host = phv->phv_lld_host;
+
+ if (scsi_host) {
+ scsi_host_put(scsi_host);
+
+ printk(KERN_INFO "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
+ printk(KERN_INFO "CORE_HBA[%d] - Detached Virtual SCSI HBA"
+ " from Generic Target Core\n", hba->hba_id);
+
+ kfree(phv);
+ hba->hba_ptr = NULL;
+
+ return 0;
+}
+
+static int pscsi_pmode_enable_hba(struct se_hba *hba, unsigned long mode_flag)
+{
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
+ struct Scsi_Host *sh = phv->phv_lld_host;
+ int hba_depth = PSCSI_VIRTUAL_HBA_DEPTH;
+ /*
+ * Release the struct Scsi_Host
+ */
+ if (!(mode_flag)) {
+ if (!(sh))
+ return 0;
+
+ phv->phv_lld_host = NULL;
+ phv->phv_mode = PHV_VIRUTAL_HOST_ID;
+ atomic_set(&hba->left_queue_depth, hba_depth);
+ atomic_set(&hba->max_queue_depth, hba_depth);
+
+ printk(KERN_INFO "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 = pscsi_get_sh(phv->phv_host_id);
+ if (!(sh)) {
+ printk(KERN_ERR "pSCSI: Unable to locate SCSI Host for"
+ " phv_host_id: %d\n", phv->phv_host_id);
+ return -1;
+ }
+ /*
+ * Usually the SCSI LLD will use the hostt->can_queue value to define
+ * its HBA TCQ depth. Some other drivers (like 2.6 megaraid) don't set
+ * this at all and set sh->can_queue at runtime.
+ */
+ hba_depth = (sh->hostt->can_queue > sh->can_queue) ?
+ sh->hostt->can_queue : sh->can_queue;
+
+ atomic_set(&hba->left_queue_depth, hba_depth);
+ atomic_set(&hba->max_queue_depth, hba_depth);
+
+ phv->phv_lld_host = sh;
+ phv->phv_mode = PHV_LLD_SCSI_HOST_NO;
+
+ printk(KERN_INFO "CORE_HBA[%d] - Enabled pSCSI HBA Passthrough %s\n",
+ hba->hba_id, (sh->hostt->name) ? (sh->hostt->name) : "Unknown");
+
+ return 1;
+}
+
+/* pscsi_add_device_to_list():
+ *
+ *
+ */
+static struct se_device *pscsi_add_device_to_list(
+ struct se_hba *hba,
+ struct se_subsystem_dev *se_dev,
+ struct pscsi_dev_virt *pdv,
+ struct scsi_device *sd,
+ int dev_flags)
+{
+ struct se_device *dev;
+
+ /*
+ * Some pseudo SCSI HBAs do not fill in sector_size
+ * correctly. (See ide-scsi.c) So go ahead and setup sane
+ * values.
+ */
+ if (!sd->sector_size) {
+ switch (sd->type) {
+ case TYPE_DISK:
+ sd->sector_size = 512;
+ break;
+ case TYPE_ROM:
+ sd->sector_size = 2048;
+ break;
+ case TYPE_TAPE: /* The Tape may not be in the drive */
+ break;
+ case TYPE_MEDIUM_CHANGER: /* Control CDBs only */
+ break;
+ default:
+ printk(KERN_ERR "Unable to set sector_size for %d\n",
+ sd->type);
+ return NULL;
+ }
+
+ if (sd->sector_size) {
+ printk(KERN_ERR "Set broken SCSI Device"
+ " %d:%d:%d sector_size to %d\n", sd->channel,
+ sd->id, sd->lun, sd->sector_size);
+ }
+ }
+
+ if (!sd->queue_depth) {
+ sd->queue_depth = PSCSI_DEFAULT_QUEUEDEPTH;
+
+ printk(KERN_ERR "Set broken SCSI Device %d:%d:%d"
+ " queue_depth to %d\n", sd->channel, sd->id,
+ sd->lun, sd->queue_depth);
+ }
+ /*
+ * Set the pointer pdv->pdv_sd to from passed struct scsi_device,
+ * which has already been referenced with Linux SCSI code with
+ * scsi_device_get() in this file's pscsi_create_virtdevice().
+ *
+ * The passthrough operations called by the transport_add_device_*
+ * function below will require this pointer to be set for passthroug
+ * ops.
+ *
+ * For the shutdown case in pscsi_free_device(), this struct
+ * scsi_device reference is released with Linux SCSI code
+ * scsi_device_put() and the pdv->pdv_sd cleared.
+ */
+ pdv->pdv_sd = sd;
+
+ dev = transport_add_device_to_core_hba(hba, &pscsi_template,
+ se_dev, dev_flags, (void *)pdv);
+ if (!(dev)) {
+ pdv->pdv_sd = NULL;
+ return NULL;
+ }
+
+ /*
+ * For TYPE_TAPE, attempt to determine blocksize with MODE_SENSE.
+ */
+ if (sd->type == TYPE_TAPE) {
+ unsigned char *buf = NULL, cdb[MAX_COMMAND_SIZE];
+ struct se_cmd *cmd;
+ u32 blocksize;
+
+ memset(cdb, 0, MAX_COMMAND_SIZE);
+ cdb[0] = MODE_SENSE;
+ cdb[4] = 0x0c; /* 12 bytes */
+
+ cmd = transport_allocate_passthrough(&cdb[0],
+ DMA_FROM_DEVICE, 0, NULL, 0, 12, dev);
+ if (!(cmd)) {
+ printk(KERN_ERR "Unable to determine blocksize for"
+ " TYPE_TAPE\n");
+ goto out;
+ }
+
+ if (transport_generic_passthrough(cmd) < 0) {
+ printk(KERN_ERR "Unable to determine blocksize for"
+ " TYPE_TAPE\n");
+ goto out;
+ }
+
+ buf = (unsigned char *)T_TASK(cmd)->t_task_buf;
+ blocksize = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
+
+ /*
+ * If MODE_SENSE still returns zero, set the default value
+ * to 1024.
+ */
+ sd->sector_size = blocksize;
+ if (!(sd->sector_size))
+ sd->sector_size = 1024;
+
+ transport_passthrough_release(cmd);
+ }
+out:
+ return dev;
+}
+
+static void *pscsi_allocate_virtdevice(struct se_hba *hba, const char *name)
+{
+ struct pscsi_dev_virt *pdv;
+
+ pdv = kzalloc(sizeof(struct pscsi_dev_virt), GFP_KERNEL);
+ if (!(pdv)) {
+ printk(KERN_ERR "Unable to allocate memory for struct pscsi_dev_virt\n");
+ return NULL;
+ }
+ pdv->pdv_se_hba = hba;
+
+ printk(KERN_INFO "PSCSI: Allocated pdv: %p for %s\n", pdv, name);
+ return (void *)pdv;
+}
+
+/*
+ * Called with struct Scsi_Host->host_lock called.
+ */
+static struct se_device *pscsi_create_type_disk(
+ struct scsi_device *sd,
+ struct pscsi_dev_virt *pdv,
+ struct se_subsystem_dev *se_dev,
+ struct se_hba *hba)
+{
+ struct se_device *dev;
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
+ struct Scsi_Host *sh = sd->host;
+ struct block_device *bd;
+ u32 dev_flags = 0;
+
+ if (scsi_device_get(sd)) {
+ printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
+ sh->host_no, sd->channel, sd->id, sd->lun);
+ spin_unlock_irq(sh->host_lock);
+ return NULL;
+ }
+ spin_unlock_irq(sh->host_lock);
+ /*
+ * Claim exclusive struct block_device access to struct scsi_device
+ * for TYPE_DISK using supplied udev_path
+ */
+ bd = open_bdev_exclusive(se_dev->se_dev_udev_path,
+ FMODE_WRITE|FMODE_READ, pdv);
+ if (!(bd)) {
+ printk("pSCSI: open_bdev_exclusive() failed\n");
+ scsi_device_put(sd);
+ return NULL;
+ }
+ pdv->pdv_bd = bd;
+
+ dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
+ if (!(dev)) {
+ close_bdev_exclusive(pdv->pdv_bd, FMODE_WRITE|FMODE_READ);
+ scsi_device_put(sd);
+ return NULL;
+ }
+ printk(KERN_INFO "CORE_PSCSI[%d] - Added TYPE_DISK for %d:%d:%d:%d\n",
+ phv->phv_host_id, sh->host_no, sd->channel, sd->id, sd->lun);
+
+ return dev;
+}
+
+/*
+ * Called with struct Scsi_Host->host_lock called.
+ */
+static struct se_device *pscsi_create_type_rom(
+ struct scsi_device *sd,
+ struct pscsi_dev_virt *pdv,
+ struct se_subsystem_dev *se_dev,
+ struct se_hba *hba)
+{
+ struct se_device *dev;
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
+ struct Scsi_Host *sh = sd->host;
+ u32 dev_flags = 0;
+
+ if (scsi_device_get(sd)) {
+ printk(KERN_ERR "scsi_device_get() failed for %d:%d:%d:%d\n",
+ sh->host_no, sd->channel, sd->id, sd->lun);
+ spin_unlock_irq(sh->host_lock);
+ return NULL;
+ }
+ spin_unlock_irq(sh->host_lock);
+
+ dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
+ if (!(dev)) {
+ scsi_device_put(sd);
+ return NULL;
+ }
+ printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
+ phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
+ sd->channel, sd->id, sd->lun);
+
+ return dev;
+}
+
+/*
+ *Called with struct Scsi_Host->host_lock called.
+ */
+static struct se_device *pscsi_create_type_other(
+ struct scsi_device *sd,
+ struct pscsi_dev_virt *pdv,
+ struct se_subsystem_dev *se_dev,
+ struct se_hba *hba)
+{
+ struct se_device *dev;
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)pdv->pdv_se_hba->hba_ptr;
+ struct Scsi_Host *sh = sd->host;
+ u32 dev_flags = 0;
+
+ spin_unlock_irq(sh->host_lock);
+ dev = pscsi_add_device_to_list(hba, se_dev, pdv, sd, dev_flags);
+ if (!(dev))
+ return NULL;
+
+ printk(KERN_INFO "CORE_PSCSI[%d] - Added Type: %s for %d:%d:%d:%d\n",
+ phv->phv_host_id, scsi_device_type(sd->type), sh->host_no,
+ sd->channel, sd->id, sd->lun);
+
+ return dev;
+}
+
+static struct se_device *pscsi_create_virtdevice(
+ struct se_hba *hba,
+ struct se_subsystem_dev *se_dev,
+ void *p)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *)p;
+ struct se_device *dev;
+ struct scsi_device *sd;
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
+ struct Scsi_Host *sh = phv->phv_lld_host;
+ int legacy_mode_enable = 0;
+
+ if (!(pdv)) {
+ printk(KERN_ERR "Unable to locate struct pscsi_dev_virt"
+ " parameter\n");
+ return NULL;
+ }
+ /*
+ * 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) {
+ printk(KERN_ERR "pSCSI: Unable to locate struct"
+ " Scsi_Host for PHV_LLD_SCSI_HOST_NO\n");
+ return NULL;
+ }
+ /*
+ * For the newer PHV_VIRUTAL_HOST_ID struct scsi_device
+ * reference, we enforce that udev_path has been set
+ */
+ if (!(se_dev->su_dev_flags & SDF_USING_UDEV_PATH)) {
+ printk(KERN_ERR "pSCSI: udev_path attribute has not"
+ " been set before ENABLE=1\n");
+ return NULL;
+ }
+ /*
+ * If no scsi_host_id= was passed for PHV_VIRUTAL_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)) {
+ spin_lock(&hba->device_lock);
+ if (!(list_empty(&hba->hba_dev_list))) {
+ printk(KERN_ERR "pSCSI: Unable to set hba_mode"
+ " with active devices\n");
+ spin_unlock(&hba->device_lock);
+ return NULL;
+ }
+ spin_unlock(&hba->device_lock);
+
+ if (pscsi_pmode_enable_hba(hba, 1) != 1)
+ return NULL;
+
+ legacy_mode_enable = 1;
+ hba->hba_flags |= HBA_FLAGS_PSCSI_MODE;
+ sh = phv->phv_lld_host;
+ } else {
+ sh = pscsi_get_sh(pdv->pdv_host_id);
+ if (!(sh)) {
+ printk(KERN_ERR "pSCSI: Unable to locate"
+ " pdv_host_id: %d\n", pdv->pdv_host_id);
+ return NULL;
+ }
+ }
+ } else {
+ if (phv->phv_mode == PHV_VIRUTAL_HOST_ID) {
+ printk(KERN_ERR "pSCSI: PHV_VIRUTAL_HOST_ID set while"
+ " struct Scsi_Host exists\n");
+ return NULL;
+ }
+ }
+
+ 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:
+ dev = pscsi_create_type_disk(sd, pdv, se_dev, hba);
+ break;
+ case TYPE_ROM:
+ dev = pscsi_create_type_rom(sd, pdv, se_dev, hba);
+ break;
+ default:
+ dev = pscsi_create_type_other(sd, pdv, se_dev, hba);
+ break;
+ }
+
+ if (!(dev)) {
+ if (phv->phv_mode == PHV_VIRUTAL_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 NULL;
+ }
+ return dev;
+ }
+ spin_unlock_irq(sh->host_lock);
+
+ printk(KERN_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_VIRUTAL_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 NULL;
+}
+
+/* pscsi_activate_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int pscsi_activate_device(struct se_device *dev)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) dev->dev_ptr;
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *) pdv->pdv_se_hba->hba_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+ struct Scsi_Host *sh = sd->host;
+
+ printk(KERN_INFO "CORE_PSCSI[%d] - Activating Device with TCQ: %d at"
+ " SCSI Location (Host/Channel/Target/LUN) %d/%d/%d/%d\n",
+ phv->phv_host_id, sd->queue_depth, sh->host_no, sd->channel,
+ sd->id, sd->lun);
+
+ return 0;
+}
+
+/* pscsi_deactivate_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void pscsi_deactivate_device(struct se_device *dev)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) dev->dev_ptr;
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *) pdv->pdv_se_hba->hba_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+ struct Scsi_Host *sh = sd->host;
+
+ printk(KERN_INFO "CORE_PSCSI[%d] - Deactivating Device with TCQ: %d at"
+ " SCSI Location (Host/Channel/Target/LUN) %d/%d/%d/%d\n",
+ phv->phv_host_id, sd->queue_depth, sh->host_no, sd->channel,
+ sd->id, sd->lun);
+}
+
+/* pscsi_free_device(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void pscsi_free_device(void *p)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) p;
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *) pdv->pdv_se_hba->hba_ptr;
+ struct scsi_device *sd = (struct scsi_device *) 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) {
+ close_bdev_exclusive(pdv->pdv_bd,
+ FMODE_WRITE|FMODE_READ);
+ 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);
+
+ if ((sd->type == TYPE_DISK) || (sd->type == TYPE_ROM))
+ scsi_device_put(sd);
+
+ pdv->pdv_sd = NULL;
+ }
+
+ kfree(pdv);
+}
+
+/* pscsi_transport_complete():
+ *
+ *
+ */
+static int pscsi_transport_complete(struct se_task *task)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) task->se_dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+ int result;
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+ unsigned char *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 (((cdb[0] == MODE_SENSE) || (cdb[0] == MODE_SENSE_10)) &&
+ (status_byte(result) << 1) == SAM_STAT_GOOD) {
+ if (!TASK_CMD(task)->se_deve)
+ goto after_mode_sense;
+
+ if (TASK_CMD(task)->se_deve->lun_flags &
+ TRANSPORT_LUNFLAGS_READ_ONLY) {
+ unsigned char *buf = (unsigned char *)
+ T_TASK(task->task_se_cmd)->t_task_buf;
+
+ if (cdb[0] == MODE_SENSE_10) {
+ if (!(buf[3] & 0x80))
+ buf[3] |= 0x80;
+ } else {
+ if (!(buf[2] & 0x80))
+ buf[2] |= 0x80;
+ }
+ }
+ }
+after_mode_sense:
+
+ if (sd->type != TYPE_TAPE)
+ 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;
+ struct scatterlist *sg = task->task_sg;
+ u16 bdl;
+ u32 blocksize;
+
+ buf = sg_virt(&sg[0]);
+ if (!(buf)) {
+ printk(KERN_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 (status_byte(result) & CHECK_CONDITION)
+ return 1;
+
+ return 0;
+}
+
+/* pscsi_allocate_request(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void *pscsi_allocate_request(
+ struct se_task *task,
+ struct se_device *dev)
+{
+ struct pscsi_plugin_task *pt;
+
+ pt = kzalloc(sizeof(struct pscsi_plugin_task), GFP_KERNEL);
+ if (!(pt)) {
+ printk(KERN_ERR "Unable to allocate struct pscsi_plugin_task\n");
+ return NULL;
+ }
+
+ return pt;
+}
+
+static inline void pscsi_blk_init_request(
+ struct se_task *task,
+ struct pscsi_plugin_task *pt,
+ struct request *req,
+ int bidi_read)
+{
+ /*
+ * Defined as "scsi command" in include/linux/blkdev.h.
+ */
+ req->cmd_type = REQ_TYPE_BLOCK_PC;
+ /*
+ * For the extra BIDI-COMMAND READ struct request we do not
+ * need to setup the remaining structure members
+ */
+ if (bidi_read)
+ return;
+ /*
+ * Setup the done function pointer for struct request,
+ * also set the end_io_data pointer.to struct se_task.
+ */
+ req->end_io = pscsi_req_done;
+ req->end_io_data = (void *)task;
+ /*
+ * Load the referenced struct se_task's SCSI CDB into
+ * include/linux/blkdev.h:struct request->cmd
+ */
+ req->cmd_len = scsi_command_size(pt->pscsi_cdb);
+ req->cmd = &pt->pscsi_cdb[0];
+ /*
+ * Setup pointer for outgoing sense data.
+ */
+ req->sense = (void *)&pt->pscsi_sense[0];
+ req->sense_len = 0;
+}
+
+/*
+ * Used for pSCSI data payloads for all *NON* SCF_SCSI_DATA_SG_IO_CDB
+*/
+static int pscsi_blk_get_request(struct se_task *task)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) task->se_dev->dev_ptr;
+
+ pt->pscsi_req = blk_get_request(pdv->pdv_sd->request_queue,
+ (pt->pscsi_direction == DMA_TO_DEVICE), GFP_KERNEL);
+ if (!(pt->pscsi_req) || IS_ERR(pt->pscsi_req)) {
+ printk(KERN_ERR "PSCSI: blk_get_request() failed: %ld\n",
+ IS_ERR(pt->pscsi_req));
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ /*
+ * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
+ * and setup rq callback, CDB and sense.
+ */
+ pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
+ return 0;
+}
+
+/* pscsi_do_task(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static int pscsi_do_task(struct se_task *task)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) task->se_dev->dev_ptr;
+ /*
+ * Set the struct request->timeout value based on peripheral
+ * device type from SCSI.
+ */
+ if (pdv->pdv_sd->type == TYPE_DISK)
+ pt->pscsi_req->timeout = PS_TIMEOUT_DISK;
+ else
+ pt->pscsi_req->timeout = PS_TIMEOUT_OTHER;
+
+ pt->pscsi_req->retries = PS_RETRY;
+ /*
+ * Queue the struct request into the struct scsi_device->request_queue.
+ */
+ blk_execute_rq_nowait(pdv->pdv_sd->request_queue, NULL,
+ pt->pscsi_req, 1, pscsi_req_done);
+
+ return PYX_TRANSPORT_SENT_TO_TRANSPORT;
+}
+
+/* pscsi_free_task(): (Part of se_subsystem_api_t template)
+ *
+ *
+ */
+static void pscsi_free_task(struct se_task *task)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *)task->transport_req;
+ /*
+ * We do not release the bio(s) here associated with this task, as
+ * this is handled by bio_put() and pscsi_bi_endio().
+ */
+ kfree(pt);
+}
+
+static ssize_t pscsi_set_configfs_dev_params(struct se_hba *hba,
+ struct se_subsystem_dev *se_dev,
+ const char *page,
+ ssize_t count)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) se_dev->se_dev_su_ptr;
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
+ char *buf, *cur, *ptr, *ptr2;
+ unsigned long scsi_host_id, scsi_channel_id;
+ unsigned long scsi_target_id, scsi_lun_id;
+ int params = 0, ret;
+
+ buf = kzalloc(count, GFP_KERNEL);
+ if (!(buf)) {
+ printk(KERN_ERR "Unable to allocate memory for temporary"
+ " buffer\n");
+ return -ENOMEM;
+ }
+ memcpy(buf, page, count);
+ cur = buf;
+
+ while (cur) {
+ ptr = strstr(cur, "=");
+ if (!(ptr))
+ goto out;
+
+ *ptr = '\0';
+ ptr++;
+
+ ptr2 = strstr(cur, "scsi_host_id");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ if (phv->phv_mode == PHV_LLD_SCSI_HOST_NO) {
+ printk(KERN_ERR "PSCSI[%d]: Unable to accept"
+ " scsi_host_id while phv_mode =="
+ " PHV_LLD_SCSI_HOST_NO\n",
+ phv->phv_host_id);
+ break;
+ }
+ ret = strict_strtoul(ptr, 0, &scsi_host_id);
+ if (ret < 0) {
+ printk(KERN_ERR "strict_strtoul() failed for"
+ " scsi_hostl_id=\n");
+ break;
+ }
+ pdv->pdv_host_id = (int)scsi_host_id;
+ printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Host ID:"
+ " %d\n", phv->phv_host_id, pdv->pdv_host_id);
+ pdv->pdv_flags |= PDF_HAS_VIRT_HOST_ID;
+ params++;
+ continue;
+ }
+ ptr2 = strstr(cur, "scsi_channel_id");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ret = strict_strtoul(ptr, 0, &scsi_channel_id);
+ if (ret < 0) {
+ printk(KERN_ERR "strict_strtoul() failed for"
+ " scsi_channel_id=\n");
+ break;
+ }
+ pdv->pdv_channel_id = (int)scsi_channel_id;
+ printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Channel"
+ " ID: %d\n", phv->phv_host_id,
+ pdv->pdv_channel_id);
+ pdv->pdv_flags |= PDF_HAS_CHANNEL_ID;
+ params++;
+ continue;
+ }
+ ptr2 = strstr(cur, "scsi_target_id");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ret = strict_strtoul(ptr, 0, &scsi_target_id);
+ if (ret < 0) {
+ printk("strict_strtoul() failed for"
+ " strict_strtoul()\n");
+ break;
+ }
+ pdv->pdv_target_id = (int)scsi_target_id;
+ printk(KERN_INFO "PSCSI[%d]: Referencing SCSI Target"
+ " ID: %d\n", phv->phv_host_id,
+ pdv->pdv_target_id);
+ pdv->pdv_flags |= PDF_HAS_TARGET_ID;
+ params++;
+ continue;
+ }
+ ptr2 = strstr(cur, "scsi_lun_id");
+ if ((ptr2)) {
+ transport_check_dev_params_delim(ptr, &cur);
+ ret = strict_strtoul(ptr, 0, &scsi_lun_id);
+ if (ret < 0) {
+ printk("strict_strtoul() failed for"
+ " scsi_lun_id=\n");
+ break;
+ }
+ pdv->pdv_lun_id = (int)scsi_lun_id;
+ printk(KERN_INFO "PSCSI[%d]: Referencing SCSI LUN ID:"
+ " %d\n", phv->phv_host_id, pdv->pdv_lun_id);
+ pdv->pdv_flags |= PDF_HAS_LUN_ID;
+ params++;
+ } else
+ cur = NULL;
+ }
+
+out:
+ kfree(buf);
+ return (params) ? count : -EINVAL;
+}
+
+static ssize_t pscsi_check_configfs_dev_params(
+ struct se_hba *hba,
+ struct se_subsystem_dev *se_dev)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) se_dev->se_dev_su_ptr;
+
+ if (!(pdv->pdv_flags & PDF_HAS_CHANNEL_ID) ||
+ !(pdv->pdv_flags & PDF_HAS_TARGET_ID) ||
+ !(pdv->pdv_flags & PDF_HAS_LUN_ID)) {
+ printk(KERN_ERR "Missing scsi_channel_id=, scsi_target_id= and"
+ " scsi_lun_id= parameters\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static ssize_t pscsi_show_configfs_dev_params(
+ struct se_hba *hba,
+ struct se_subsystem_dev *se_dev,
+ char *page)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) se_dev->se_dev_su_ptr;
+ int bl = 0;
+
+ __pscsi_get_dev_info(pdv, page, &bl);
+ return (ssize_t)bl;
+}
+
+static void pscsi_get_plugin_info(void *p, char *b, int *bl)
+{
+ *bl += sprintf(b + *bl, "TCM SCSI Plugin %s\n", PSCSI_VERSION);
+}
+
+static void pscsi_get_hba_info(struct se_hba *hba, char *b, int *bl)
+{
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *)hba->hba_ptr;
+ struct Scsi_Host *sh = phv->phv_lld_host;
+
+ *bl += sprintf(b + *bl, "Core Host ID: %u PHV Host ID: %u\n",
+ hba->hba_id, phv->phv_host_id);
+ if (sh)
+ *bl += sprintf(b + *bl, " SCSI HBA ID %u: %s <local>\n",
+ sh->host_no, (sh->hostt->name) ?
+ (sh->hostt->name) : "Unknown");
+}
+
+static void pscsi_get_dev_info(struct se_device *dev, char *b, int *bl)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) dev->dev_ptr;
+
+ __pscsi_get_dev_info(pdv, b, bl);
+}
+
+static void __pscsi_get_dev_info(struct pscsi_dev_virt *pdv, char *b, int *bl)
+{
+ struct pscsi_hba_virt *phv = (struct pscsi_hba_virt *) pdv->pdv_se_hba->hba_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+ unsigned char host_id[16];
+ int i;
+
+ if (phv->phv_mode == PHV_VIRUTAL_HOST_ID)
+ snprintf(host_id, 16, "%d", pdv->pdv_host_id);
+ else
+ snprintf(host_id, 16, "PHBA Mode");
+
+ *bl += sprintf(b + *bl, "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");
+ }
+}
+
+static void pscsi_bi_endio(struct bio *bio, int error)
+{
+ bio_put(bio);
+}
+
+static inline struct bio *pscsi_get_bio(struct pscsi_dev_virt *pdv, int sg_num)
+{
+ 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, sg_num);
+ if (!(bio)) {
+ printk(KERN_ERR "PSCSI: bio_kmalloc() failed\n");
+ return NULL;
+ }
+ bio->bi_end_io = pscsi_bi_endio;
+
+ return bio;
+}
+
+#if 0
+#define DEBUG_PSCSI(x...) printk(x)
+#else
+#define DEBUG_PSCSI(x...)
+#endif
+
+static int __pscsi_map_task_SG(
+ struct se_task *task,
+ struct scatterlist *task_sg,
+ u32 task_sg_num,
+ int bidi_read)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) task->se_dev->dev_ptr;
+ struct bio *bio = NULL, *hbio = NULL, *tbio = NULL;
+ struct page *page;
+ struct scatterlist *sg;
+ u32 data_len = task->task_size, i, len, bytes, off;
+ int nr_pages = (task->task_size + task_sg[0].offset +
+ PAGE_SIZE - 1) >> PAGE_SHIFT;
+ int nr_vecs = 0, ret = 0;
+ int rw = (TASK_CMD(task)->data_direction == DMA_TO_DEVICE);
+
+ if (!task->task_size)
+ return 0;
+ /*
+ * For SCF_SCSI_DATA_SG_IO_CDB, Use fs/bio.c:bio_add_page() to setup
+ * the bio_vec maplist from TC< struct se_mem -> task->task_sg ->
+ * struct scatterlist memory. The struct se_task->task_sg[] currently needs
+ * to be attached to struct bios for submission to Linux/SCSI using
+ * struct request to struct scsi_device->request_queue.
+ *
+ * Note that this will be changing post v2.6.28 as Target_Core_Mod/pSCSI
+ * is ported to upstream SCSI passthrough functionality that accepts
+ * struct scatterlist->page_link or struct page as a paraemeter.
+ */
+ DEBUG_PSCSI("PSCSI: nr_pages: %d\n", nr_pages);
+
+ for_each_sg(task_sg, sg, task_sg_num, i) {
+ page = sg_page(sg);
+ off = sg->offset;
+ len = sg->length;
+
+ DEBUG_PSCSI("PSCSI: i: %d page: %p len: %d off: %d\n", i,
+ page, len, off);
+
+ while (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(pdv, nr_vecs);
+ if (!(bio))
+ goto fail;
+
+ if (rw)
+ bio->bi_rw |= REQ_WRITE;
+
+ DEBUG_PSCSI("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
+ * struct se_task
+ */
+ if (!hbio)
+ hbio = tbio = bio;
+ else
+ tbio = tbio->bi_next = bio;
+ }
+
+ DEBUG_PSCSI("PSCSI: Calling bio_add_pc_page() i: %d"
+ " bio: %p page: %p len: %d off: %d\n", i, bio,
+ page, len, off);
+
+ ret = bio_add_pc_page(pdv->pdv_sd->request_queue,
+ bio, page, bytes, off);
+ if (ret != bytes)
+ goto fail;
+
+ DEBUG_PSCSI("PSCSI: bio->bi_vcnt: %d nr_vecs: %d\n",
+ bio->bi_vcnt, nr_vecs);
+
+ if (bio->bi_vcnt > nr_vecs) {
+ DEBUG_PSCSI("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;
+ }
+
+ page++;
+ len -= bytes;
+ data_len -= bytes;
+ off = 0;
+ }
+ }
+ /*
+ * Setup the primary pt->pscsi_req used for non BIDI and BIDI-COMMAND
+ * primary SCSI WRITE poayload mapped for struct se_task->task_sg[]
+ */
+ if (!(bidi_read)) {
+ /*
+ * Starting with v2.6.31, call blk_make_request() passing in *hbio to
+ * allocate the pSCSI task a struct request.
+ */
+ pt->pscsi_req = blk_make_request(pdv->pdv_sd->request_queue,
+ hbio, GFP_KERNEL);
+ if (!(pt->pscsi_req)) {
+ printk(KERN_ERR "pSCSI: blk_make_request() failed\n");
+ goto fail;
+ }
+ /*
+ * Setup the newly allocated struct request for REQ_TYPE_BLOCK_PC,
+ * and setup rq callback, CDB and sense.
+ */
+ pscsi_blk_init_request(task, pt, pt->pscsi_req, 0);
+
+ return task->task_sg_num;
+ }
+ /*
+ * Setup the secondary pt->pscsi_req_bidi used for the extra BIDI-COMMAND
+ * SCSI READ paylaod mapped for struct se_task->task_sg_bidi[]
+ */
+ pt->pscsi_req_bidi = blk_make_request(pdv->pdv_sd->request_queue,
+ hbio, GFP_KERNEL);
+ if (!(pt->pscsi_req_bidi)) {
+ printk(KERN_ERR "pSCSI: blk_make_request() failed for BIDI\n");
+ goto fail;
+ }
+ pscsi_blk_init_request(task, pt, pt->pscsi_req_bidi, 1);
+ /*
+ * Setup the magic BIDI-COMMAND ->next_req pointer to the original
+ * pt->pscsi_req.
+ */
+ pt->pscsi_req->next_rq = pt->pscsi_req_bidi;
+
+ return task->task_sg_num;
+fail:
+ while (hbio) {
+ bio = hbio;
+ hbio = hbio->bi_next;
+ bio->bi_next = NULL;
+ bio_endio(bio, 0);
+ }
+ return ret;
+}
+
+static int pscsi_map_task_SG(struct se_task *task)
+{
+ int ret;
+ /*
+ * Setup the main struct request for the task->task_sg[] payload
+ */
+
+ ret = __pscsi_map_task_SG(task, task->task_sg, task->task_sg_num, 0);
+ if (ret < 0)
+ return ret;
+
+ if (!(task->task_sg_bidi))
+ return ret;
+ /*
+ * If present, set up the extra BIDI-COMMAND SCSI READ
+ * struct request and payload.
+ */
+ return __pscsi_map_task_SG(task, task->task_sg_bidi,
+ task->task_sg_num, 1);
+}
+
+/* pscsi_map_task_non_SG():
+ *
+ *
+ */
+static int pscsi_map_task_non_SG(struct se_task *task)
+{
+ struct se_cmd *cmd = TASK_CMD(task);
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) task->se_dev->dev_ptr;
+ int ret = 0;
+
+ if (!task->task_size)
+ return 0;
+
+ ret = blk_rq_map_kern(pdv->pdv_sd->request_queue,
+ pt->pscsi_req, T_TASK(cmd)->t_task_buf,
+ task->task_size, GFP_KERNEL);
+ if (ret < 0) {
+ printk(KERN_ERR "PSCSI: blk_rq_map_kern() failed: %d\n", ret);
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+ }
+ return 0;
+}
+
+static int pscsi_CDB_none(struct se_task *task, u32 size)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+
+ pt->pscsi_direction = DMA_NONE;
+
+ return pscsi_blk_get_request(task);
+}
+
+/* pscsi_CDB_read_non_SG():
+ *
+ *
+ */
+static int pscsi_CDB_read_non_SG(struct se_task *task, u32 size)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+
+ pt->pscsi_direction = DMA_FROM_DEVICE;
+
+ if (pscsi_blk_get_request(task) < 0)
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+ return pscsi_map_task_non_SG(task);
+}
+
+/* pscsi_CDB_read_SG():
+ *
+ *
+ */
+static int pscsi_CDB_read_SG(struct se_task *task, u32 size)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+
+ pt->pscsi_direction = DMA_FROM_DEVICE;
+ /*
+ * pscsi_map_task_SG() calls block/blk-core.c:blk_make_request()
+ * for >= v2.6.31 pSCSI
+ */
+ if (pscsi_map_task_SG(task) < 0)
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+ return task->task_sg_num;
+}
+
+/* pscsi_CDB_write_non_SG():
+ *
+ *
+ */
+static int pscsi_CDB_write_non_SG(struct se_task *task, u32 size)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+
+ pt->pscsi_direction = DMA_TO_DEVICE;
+
+ if (pscsi_blk_get_request(task) < 0)
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+ return pscsi_map_task_non_SG(task);
+}
+
+/* pscsi_CDB_write_SG():
+ *
+ *
+ */
+static int pscsi_CDB_write_SG(struct se_task *task, u32 size)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+
+ pt->pscsi_direction = DMA_TO_DEVICE;
+ /*
+ * pscsi_map_task_SG() calls block/blk-core.c:blk_make_request()
+ * for >= v2.6.31 pSCSI
+ */
+ if (pscsi_map_task_SG(task) < 0)
+ return PYX_TRANSPORT_LU_COMM_FAILURE;
+
+ return task->task_sg_num;
+}
+
+/* pscsi_check_lba():
+ *
+ *
+ */
+static int pscsi_check_lba(unsigned long long lba, struct se_device *dev)
+{
+ return 0;
+}
+
+/* pscsi_check_for_SG():
+ *
+ *
+ */
+static int pscsi_check_for_SG(struct se_task *task)
+{
+ return task->task_sg_num;
+}
+
+/* pscsi_get_cdb():
+ *
+ *
+ */
+static unsigned char *pscsi_get_cdb(struct se_task *task)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+
+ return pt->pscsi_cdb;
+}
+
+/* pscsi_get_sense_buffer():
+ *
+ *
+ */
+static unsigned char *pscsi_get_sense_buffer(struct se_task *task)
+{
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *) task->transport_req;
+
+ return (unsigned char *)&pt->pscsi_sense[0];
+}
+
+/* pscsi_get_blocksize():
+ *
+ *
+ */
+static u32 pscsi_get_blocksize(struct se_device *dev)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ return sd->sector_size;
+}
+
+/* pscsi_get_device_rev():
+ *
+ *
+ */
+static u32 pscsi_get_device_rev(struct se_device *dev)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ return (sd->scsi_level - 1) ? sd->scsi_level - 1 : 1;
+}
+
+/* pscsi_get_device_type():
+ *
+ *
+ */
+static u32 pscsi_get_device_type(struct se_device *dev)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ return sd->type;
+}
+
+/* pscsi_get_dma_length():
+ *
+ *
+ */
+static u32 pscsi_get_dma_length(u32 task_size, struct se_device *dev)
+{
+ return PAGE_SIZE;
+}
+
+/* pscsi_get_max_sectors():
+ *
+ *
+ */
+static u32 pscsi_get_max_sectors(struct se_device *dev)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ return (sd->host->max_sectors > sd->request_queue->limits.max_sectors) ?
+ sd->request_queue->limits.max_sectors : sd->host->max_sectors;
+}
+
+/* pscsi_get_queue_depth():
+ *
+ *
+ */
+static u32 pscsi_get_queue_depth(struct se_device *dev)
+{
+ struct pscsi_dev_virt *pdv = (struct pscsi_dev_virt *) dev->dev_ptr;
+ struct scsi_device *sd = (struct scsi_device *) pdv->pdv_sd;
+
+ return sd->queue_depth;
+}
+
+/* pscsi_handle_SAM_STATUS_failures():
+ *
+ *
+ */
+static inline void pscsi_process_SAM_status(
+ struct se_task *task,
+ struct pscsi_plugin_task *pt)
+{
+ task->task_scsi_status = status_byte(pt->pscsi_result);
+ if ((task->task_scsi_status)) {
+ task->task_scsi_status <<= 1;
+ printk(KERN_INFO "PSCSI Status Byte exception at task: %p CDB:"
+ " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
+ pt->pscsi_result);
+ }
+
+ switch (host_byte(pt->pscsi_result)) {
+ case DID_OK:
+ transport_complete_task(task, (!task->task_scsi_status));
+ break;
+ default:
+ printk(KERN_INFO "PSCSI Host Byte exception at task: %p CDB:"
+ " 0x%02x Result: 0x%08x\n", task, pt->pscsi_cdb[0],
+ pt->pscsi_result);
+ task->task_scsi_status = SAM_STAT_CHECK_CONDITION;
+ task->task_error_status = PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ TASK_CMD(task)->transport_error_status =
+ PYX_TRANSPORT_UNKNOWN_SAM_OPCODE;
+ transport_complete_task(task, 0);
+ break;
+ }
+
+ return;
+}
+
+static void pscsi_req_done(struct request *req, int uptodate)
+{
+ struct se_task *task = (struct se_task *)req->end_io_data;
+ struct pscsi_plugin_task *pt = (struct pscsi_plugin_task *)task->transport_req;
+
+ pt->pscsi_result = req->errors;
+ pt->pscsi_resid = req->resid_len;
+
+ pscsi_process_SAM_status(task, pt);
+
+ if (req->next_rq != NULL) {
+ __blk_put_request(req->q, req->next_rq);
+ pt->pscsi_req_bidi = NULL;
+ }
+
+ __blk_put_request(req->q, req);
+ pt->pscsi_req = NULL;
+}
+
+static struct se_subsystem_api pscsi_template = {
+ .name = "pscsi",
+ .type = PSCSI,
+ .transport_type = TRANSPORT_PLUGIN_PHBA_PDEV,
+ .external_submod = 1,
+ .cdb_none = pscsi_CDB_none,
+ .cdb_read_non_SG = pscsi_CDB_read_non_SG,
+ .cdb_read_SG = pscsi_CDB_read_SG,
+ .cdb_write_non_SG = pscsi_CDB_write_non_SG,
+ .cdb_write_SG = pscsi_CDB_write_SG,
+ .attach_hba = pscsi_attach_hba,
+ .detach_hba = pscsi_detach_hba,
+ .pmode_enable_hba = pscsi_pmode_enable_hba,
+ .activate_device = pscsi_activate_device,
+ .deactivate_device = pscsi_deactivate_device,
+ .allocate_virtdevice = pscsi_allocate_virtdevice,
+ .create_virtdevice = pscsi_create_virtdevice,
+ .free_device = pscsi_free_device,
+ .transport_complete = pscsi_transport_complete,
+ .allocate_request = pscsi_allocate_request,
+ .do_task = pscsi_do_task,
+ .free_task = pscsi_free_task,
+ .check_configfs_dev_params = pscsi_check_configfs_dev_params,
+ .set_configfs_dev_params = pscsi_set_configfs_dev_params,
+ .show_configfs_dev_params = pscsi_show_configfs_dev_params,
+ .create_virtdevice_from_fd = NULL,
+ .get_plugin_info = pscsi_get_plugin_info,
+ .get_hba_info = pscsi_get_hba_info,
+ .get_dev_info = pscsi_get_dev_info,
+ .check_lba = pscsi_check_lba,
+ .check_for_SG = pscsi_check_for_SG,
+ .get_cdb = pscsi_get_cdb,
+ .get_sense_buffer = pscsi_get_sense_buffer,
+ .get_blocksize = pscsi_get_blocksize,
+ .get_device_rev = pscsi_get_device_rev,
+ .get_device_type = pscsi_get_device_type,
+ .get_dma_length = pscsi_get_dma_length,
+ .get_max_sectors = pscsi_get_max_sectors,
+ .get_queue_depth = pscsi_get_queue_depth,
+ .write_pending = NULL,
+};
+
+int __init pscsi_module_init(void)
+{
+ int ret;
+
+ INIT_LIST_HEAD(&pscsi_template.sub_api_list);
+
+ ret = transport_subsystem_register(&pscsi_template, THIS_MODULE);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+void 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);
diff --git a/drivers/target/target_core_pscsi.h b/drivers/target/target_core_pscsi.h
new file mode 100644
index 0000000..d3c8972
--- /dev/null
+++ b/drivers/target/target_core_pscsi.h
@@ -0,0 +1,69 @@
+#ifndef TARGET_CORE_PSCSI_H
+#define TARGET_CORE_PSCSI_H
+
+#define PSCSI_VERSION "v4.0"
+#define PSCSI_VIRTUAL_HBA_DEPTH 2048
+
+/* used in pscsi_find_alloc_len() */
+#ifndef INQUIRY_DATA_SIZE
+#define INQUIRY_DATA_SIZE 0x24
+#endif
+
+/* used in pscsi_add_device_to_list() */
+#define PSCSI_DEFAULT_QUEUEDEPTH 1
+
+#define PS_RETRY 5
+#define PS_TIMEOUT_DISK (15*HZ)
+#define PS_TIMEOUT_OTHER (500*HZ)
+
+extern struct se_global *se_global;
+extern struct block_device *linux_blockdevice_claim(int, int, void *);
+extern int linux_blockdevice_release(int, int, struct block_device *);
+extern int linux_blockdevice_check(int, int);
+
+#include <linux/device.h>
+#include <scsi/scsi_driver.h>
+#include <scsi/scsi_device.h>
+#include <linux/kref.h>
+#include <linux/kobject.h>
+
+struct pscsi_plugin_task {
+ unsigned char pscsi_cdb[TCM_MAX_COMMAND_SIZE];
+ unsigned char pscsi_sense[SCSI_SENSE_BUFFERSIZE];
+ int pscsi_direction;
+ int pscsi_result;
+ u32 pscsi_resid;
+ struct request *pscsi_req;
+ struct request *pscsi_req_bidi;
+} ____cacheline_aligned;
+
+#define PDF_HAS_CHANNEL_ID 0x01
+#define PDF_HAS_TARGET_ID 0x02
+#define PDF_HAS_LUN_ID 0x04
+#define PDF_HAS_VPD_UNIT_SERIAL 0x08
+#define PDF_HAS_VPD_DEV_IDENT 0x10
+#define PDF_HAS_VIRT_HOST_ID 0x20
+
+struct pscsi_dev_virt {
+ int pdv_flags;
+ int pdv_host_id;
+ int pdv_channel_id;
+ int pdv_target_id;
+ int pdv_lun_id;
+ struct block_device *pdv_bd;
+ struct scsi_device *pdv_sd;
+ struct se_hba *pdv_se_hba;
+} ____cacheline_aligned;
+
+typedef enum phv_modes {
+ PHV_VIRUTAL_HOST_ID,
+ PHV_LLD_SCSI_HOST_NO
+} phv_modes_t;
+
+struct pscsi_hba_virt {
+ int phv_host_id;
+ phv_modes_t phv_mode;
+ struct Scsi_Host *phv_lld_host;
+} ____cacheline_aligned;
+
+#endif /*** TARGET_CORE_PSCSI_H ***/
--
1.7.3


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