[linux-2.6.18-xen] pvSCSI backend driver

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[linux-2.6.18-xen] pvSCSI backend driver

Xen patchbot-linux-2.6.18-xen
# HG changeset patch
# User Keir Fraser <[hidden email]>
# Date 1212397107 -3600
# Node ID 66faefe721ebb4c9490f3b06b653386d9d2ad4af
# Parent  557a4a0a5eacb83ffb2808c66fd9674e8e26f3e0
pvSCSI backend driver

Signed-off-by: Tomonari Horikoshi <[hidden email]>
Signed-off-by: Jun Kamada <[hidden email]>
---
 buildconfigs/linux-defconfig_xen0_ia64   |    1
 buildconfigs/linux-defconfig_xen0_x86_32 |    1
 buildconfigs/linux-defconfig_xen0_x86_64 |    1
 buildconfigs/linux-defconfig_xen_ia64    |    1
 buildconfigs/linux-defconfig_xen_x86_32  |    1
 buildconfigs/linux-defconfig_xen_x86_64  |    1
 drivers/xen/Kconfig                      |   10
 drivers/xen/Makefile                     |    1
 drivers/xen/scsiback/Makefile            |    4
 drivers/xen/scsiback/common.h            |  181 +++++++
 drivers/xen/scsiback/emulate.c           |  275 +++++++++++
 drivers/xen/scsiback/interface.c         |  184 +++++++
 drivers/xen/scsiback/scsiback.c          |  734 +++++++++++++++++++++++++++++++
 drivers/xen/scsiback/translate.c         |  166 +++++++
 drivers/xen/scsiback/xenbus.c            |  365 +++++++++++++++
 15 files changed, 1925 insertions(+), 1 deletion(-)

diff -r 557a4a0a5eac -r 66faefe721eb buildconfigs/linux-defconfig_xen0_ia64
--- a/buildconfigs/linux-defconfig_xen0_ia64 Fri May 30 19:08:50 2008 +0100
+++ b/buildconfigs/linux-defconfig_xen0_ia64 Mon Jun 02 09:58:27 2008 +0100
@@ -1681,6 +1681,7 @@ CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER=y
 CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER=y
 # CONFIG_XEN_PCIDEV_BE_DEBUG is not set
 CONFIG_XEN_TPMDEV_BACKEND=m
+CONFIG_XEN_SCSI_BACKEND=m
 CONFIG_XEN_BLKDEV_FRONTEND=y
 CONFIG_XEN_NETDEV_FRONTEND=y
 CONFIG_XEN_GRANT_DEV=y
diff -r 557a4a0a5eac -r 66faefe721eb buildconfigs/linux-defconfig_xen0_x86_32
--- a/buildconfigs/linux-defconfig_xen0_x86_32 Fri May 30 19:08:50 2008 +0100
+++ b/buildconfigs/linux-defconfig_xen0_x86_32 Mon Jun 02 09:58:27 2008 +0100
@@ -1418,6 +1418,7 @@ CONFIG_XEN_PCIDEV_BACKEND_PASS=y
 # CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER is not set
 # CONFIG_XEN_PCIDEV_BE_DEBUG is not set
 CONFIG_XEN_TPMDEV_BACKEND=m
+CONFIG_XEN_SCSI_BACKEND=m
 CONFIG_XEN_BLKDEV_FRONTEND=y
 CONFIG_XEN_NETDEV_FRONTEND=y
 CONFIG_XEN_GRANT_DEV=y
diff -r 557a4a0a5eac -r 66faefe721eb buildconfigs/linux-defconfig_xen0_x86_64
--- a/buildconfigs/linux-defconfig_xen0_x86_64 Fri May 30 19:08:50 2008 +0100
+++ b/buildconfigs/linux-defconfig_xen0_x86_64 Mon Jun 02 09:58:27 2008 +0100
@@ -1359,6 +1359,7 @@ CONFIG_XEN_PCIDEV_BACKEND_PASS=y
 # CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER is not set
 # CONFIG_XEN_PCIDEV_BE_DEBUG is not set
 # CONFIG_XEN_TPMDEV_BACKEND is not set
+# CONFIG_XEN_SCSI_BACKEND is not set
 CONFIG_XEN_BLKDEV_FRONTEND=y
 CONFIG_XEN_NETDEV_FRONTEND=y
 CONFIG_XEN_GRANT_DEV=y
diff -r 557a4a0a5eac -r 66faefe721eb buildconfigs/linux-defconfig_xen_ia64
--- a/buildconfigs/linux-defconfig_xen_ia64 Fri May 30 19:08:50 2008 +0100
+++ b/buildconfigs/linux-defconfig_xen_ia64 Mon Jun 02 09:58:27 2008 +0100
@@ -1681,6 +1681,7 @@ CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER=y
 CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER=y
 # CONFIG_XEN_PCIDEV_BE_DEBUG is not set
 CONFIG_XEN_TPMDEV_BACKEND=m
+CONFIG_XEN_SCSI_BACKEND=m
 CONFIG_XEN_BLKDEV_FRONTEND=y
 CONFIG_XEN_NETDEV_FRONTEND=y
 CONFIG_XEN_GRANT_DEV=y
diff -r 557a4a0a5eac -r 66faefe721eb buildconfigs/linux-defconfig_xen_x86_32
--- a/buildconfigs/linux-defconfig_xen_x86_32 Fri May 30 19:08:50 2008 +0100
+++ b/buildconfigs/linux-defconfig_xen_x86_32 Mon Jun 02 09:58:27 2008 +0100
@@ -3276,6 +3276,7 @@ CONFIG_XEN_PCIDEV_BACKEND_VPCI=y
 # CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER is not set
 # CONFIG_XEN_PCIDEV_BE_DEBUG is not set
 CONFIG_XEN_TPMDEV_BACKEND=m
+CONFIG_XEN_SCSI_BACKEND=m
 CONFIG_XEN_BLKDEV_FRONTEND=y
 CONFIG_XEN_NETDEV_FRONTEND=y
 CONFIG_XEN_GRANT_DEV=y
diff -r 557a4a0a5eac -r 66faefe721eb buildconfigs/linux-defconfig_xen_x86_64
--- a/buildconfigs/linux-defconfig_xen_x86_64 Fri May 30 19:08:50 2008 +0100
+++ b/buildconfigs/linux-defconfig_xen_x86_64 Mon Jun 02 09:58:27 2008 +0100
@@ -3106,6 +3106,7 @@ CONFIG_XEN_PCIDEV_BACKEND_PASS=y
 # CONFIG_XEN_PCIDEV_BACKEND_CONTROLLER is not set
 # CONFIG_XEN_PCIDEV_BE_DEBUG is not set
 CONFIG_XEN_TPMDEV_BACKEND=m
+CONFIG_XEN_SCSI_BACKEND=m
 CONFIG_XEN_BLKDEV_FRONTEND=y
 CONFIG_XEN_NETDEV_FRONTEND=y
 CONFIG_XEN_GRANT_DEV=y
diff -r 557a4a0a5eac -r 66faefe721eb drivers/xen/Kconfig
--- a/drivers/xen/Kconfig Fri May 30 19:08:50 2008 +0100
+++ b/drivers/xen/Kconfig Mon Jun 02 09:58:27 2008 +0100
@@ -166,9 +166,17 @@ config XEN_TPMDEV_BACKEND
  help
   The TPM-device backend driver
 
+config XEN_SCSI_BACKEND
+ tristate "SCSI backend driver"
+ depends on XEN_BACKEND
+ default n
+ help
+  The SCSI backend driver allows the kernel to export its SCSI Devices
+  to other guests via a high-performance shared-memory interface.
+
 config XEN_BLKDEV_FRONTEND
  tristate "Block-device frontend driver"
- default y
+ default m
  help
   The block-device frontend driver allows the kernel to access block
   devices mounted within another guest OS. Unless you are building a
diff -r 557a4a0a5eac -r 66faefe721eb drivers/xen/Makefile
--- a/drivers/xen/Makefile Fri May 30 19:08:50 2008 +0100
+++ b/drivers/xen/Makefile Mon Jun 02 09:58:27 2008 +0100
@@ -16,6 +16,7 @@ obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += pci
 obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += pcifront/
 obj-$(CONFIG_XEN_FRAMEBUFFER) += fbfront/
 obj-$(CONFIG_XEN_KEYBOARD) += fbfront/
+obj-$(CONFIG_XEN_SCSI_BACKEND) += scsiback/
 obj-$(CONFIG_XEN_PRIVCMD) += privcmd/
 obj-$(CONFIG_XEN_GRANT_DEV) += gntdev/
 obj-$(CONFIG_XEN_NETDEV_ACCEL_SFC_UTIL) += sfc_netutil/
diff -r 557a4a0a5eac -r 66faefe721eb drivers/xen/scsiback/Makefile
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/scsiback/Makefile Mon Jun 02 09:58:27 2008 +0100
@@ -0,0 +1,4 @@
+obj-$(CONFIG_XEN_SCSI_BACKEND) := xen-scsibk.o
+
+xen-scsibk-y := interface.o scsiback.o xenbus.o translate.o
+
diff -r 557a4a0a5eac -r 66faefe721eb drivers/xen/scsiback/common.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/scsiback/common.h Mon Jun 02 09:58:27 2008 +0100
@@ -0,0 +1,181 @@
+/*
+ * Copyright (c) 2008, FUJITSU Limited
+ *
+ * Based on the blkback driver code.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef __SCSIIF__BACKEND__COMMON_H__
+#define __SCSIIF__BACKEND__COMMON_H__
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/kthread.h>
+#include <linux/blkdev.h>
+#include <linux/list.h>
+#include <linux/kthread.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_eh.h>
+#include <asm/io.h>
+#include <asm/setup.h>
+#include <asm/pgalloc.h>
+#include <asm/delay.h>
+#include <xen/evtchn.h>
+#include <asm/hypervisor.h>
+#include <xen/gnttab.h>
+#include <xen/driver_util.h>
+#include <xen/xenbus.h>
+#include <xen/interface/io/ring.h>
+#include <xen/interface/grant_table.h>
+#include <xen/interface/io/vscsiif.h>
+
+
+
+#define DPRINTK(_f, _a...) \
+ pr_debug("(file=%s, line=%d) " _f, \
+ __FILE__ , __LINE__ , ## _a )
+
+struct ids_tuple {
+ unsigned int hst; /* host    */
+ unsigned int chn; /* channel */
+ unsigned int tgt; /* target  */
+ unsigned int lun; /* LUN     */
+};
+
+struct v2p_entry {
+ struct ids_tuple v; /* translate from */
+ struct scsi_device *sdev; /* translate to   */
+ struct list_head l;
+};
+
+struct vscsibk_info {
+ struct xenbus_device *dev;
+
+ domid_t domid;
+ unsigned int evtchn;
+ unsigned int irq;
+
+ struct vscsiif_back_ring  ring;
+ struct vm_struct *ring_area;
+ grant_handle_t shmem_handle;
+ grant_ref_t shmem_ref;
+
+ spinlock_t ring_lock;
+ atomic_t refcnt;
+
+ spinlock_t v2p_lock;
+ struct list_head v2p_entry_lists;
+
+ struct task_struct *kthread;
+ wait_queue_head_t waiting_to_free;
+ wait_queue_head_t wq;
+ unsigned int waiting_reqs;
+ struct page **mmap_pages;
+
+};
+
+typedef struct {
+ unsigned char act;
+ struct vscsibk_info *info;
+ struct scsi_device *sdev;
+
+ uint16_t rqid;
+
+ vscsiif_request_t *ring_req;
+
+ uint8_t nr_segments;
+ uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE];
+ uint8_t cmd_len;
+
+ uint8_t sc_data_direction;
+ uint16_t timeout_per_command;
+
+ uint32_t request_bufflen;
+ struct scatterlist *sgl;
+ grant_ref_t gref[VSCSIIF_SENSE_BUFFERSIZE];
+
+ int32_t rslt;
+ uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE];
+
+ struct list_head free_list;
+} pending_req_t;
+
+
+
+#define scsiback_get(_b) (atomic_inc(&(_b)->refcnt))
+#define scsiback_put(_b) \
+ do { \
+ if (atomic_dec_and_test(&(_b)->refcnt)) \
+ wake_up(&(_b)->waiting_to_free);\
+ } while (0)
+
+#define VSCSIIF_TIMEOUT (900*HZ)
+
+
+irqreturn_t scsiback_intr(int, void *, struct pt_regs *);
+int scsiback_init_sring(struct vscsibk_info *info,
+ unsigned long ring_ref, unsigned int evtchn);
+int scsiback_schedule(void *data);
+
+
+struct vscsibk_info *vscsibk_info_alloc(domid_t domid);
+void scsiback_free(struct vscsibk_info *info);
+void scsiback_disconnect(struct vscsibk_info *info);
+int __init scsiback_interface_init(void);
+void __exit scsiback_interface_exit(void);
+int scsiback_xenbus_init(void);
+void scsiback_xenbus_unregister(void);
+
+void scsiback_init_translation_table(struct vscsibk_info *info);
+
+int scsiback_add_translation_entry(struct vscsibk_info *info,
+ struct scsi_device *sdev, struct ids_tuple *v);
+
+int scsiback_del_translation_entry(struct vscsibk_info *info,
+ struct ids_tuple *v);
+struct scsi_device *scsiback_do_translation(struct vscsibk_info *info,
+ struct ids_tuple *v);
+void scsiback_release_translation_entry(struct vscsibk_info *info);
+
+
+void scsiback_cmd_exec(pending_req_t *pending_req);
+
+#if 0 /*SAMPLE CODING(tentative)*//*emulation*/
+void scsiback_dispatch_emulation_cmdexec(vscsiif_request_t *ring_req,
+ pending_req_t *pending_req);
+#endif
+
+
+#endif /* __SCSIIF__BACKEND__COMMON_H__ */
diff -r 557a4a0a5eac -r 66faefe721eb drivers/xen/scsiback/emulate.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/scsiback/emulate.c Mon Jun 02 09:58:27 2008 +0100
@@ -0,0 +1,275 @@
+/*
+ * Xen SCSI backend driver
+ *
+ * Copyright (c) 2008, FUJITSU Limited
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include "comback.h"
+
+/* Following SCSI commands are not defined in scsi/scsi.h */
+#define EXTENDED_COPY 0x83 /* EXTENDED COPY command        */
+#define REPORT_ALIASES 0xa3 /* REPORT ALIASES command       */
+#define CHANGE_ALIASES 0xa4 /* CHANGE ALIASES command       */
+#define SET_PRIORITY 0xa4 /* SET PRIORITY command         */
+
+
+/*
+  The bitmap in order to control emulation.
+  (Bit 3 to 7 are reserved for future use.)
+*/
+#define VSCSIIF_NEED_CMD_EXEC 0x01 /* If this bit is set, cmd exec */
+ /* is required. */
+#define VSCSIIF_NEED_EMULATE_REQBUF 0x02 /* If this bit is set, need */
+ /* emulation reqest buff before */
+ /* cmd exec. */
+#define VSCSIIF_NEED_EMULATE_RSPBUF 0x04 /* If this bit is set, need */
+ /* emulation resp buff after */
+ /* cmd exec. */
+
+/* Additional Sense Code (ASC) used */
+#define NO_ADDITIONAL_SENSE 0x0
+#define LOGICAL_UNIT_NOT_READY 0x4
+#define UNRECOVERED_READ_ERR 0x11
+#define PARAMETER_LIST_LENGTH_ERR 0x1a
+#define INVALID_OPCODE 0x20
+#define ADDR_OUT_OF_RANGE 0x21
+#define INVALID_FIELD_IN_CDB 0x24
+#define INVALID_FIELD_IN_PARAM_LIST 0x26
+#define POWERON_RESET 0x29
+#define SAVING_PARAMS_UNSUP 0x39
+#define THRESHOLD_EXCEEDED 0x5d
+#define LOW_POWER_COND_ON 0x5e
+
+
+
+/* Number os SCSI op_code */
+#define VSCSI_MAX_SCSI_OP_CODE 256
+static unsigned char bitmap[VSCSI_MAX_SCSI_OP_CODE];
+
+/*
+  Emulation routines for each SCSI op_code.
+*/
+static void (*pre_function[MAX_SCSI_OP_CODE])(pending_request_t *, void *);
+static void (*post_function[MAX_SCSI_OP_CODE])(pending_request_t *, void *);
+
+
+static const int check_condition_result =
+ (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
+
+
+static int __copy_to_sg(struct scatterlist *sg, unsigned int nr_sg,
+       void *buf, unsigned int buflen)
+{
+ void *from = buf;
+ void *to;
+ unsigned int from_rest = buflen;
+ unsigned int to_capa;
+ unsigned int copy_size;
+ unsigned int i;
+
+ for (i = 0; i < nr_sg; i++) {
+ if (sg->page == NULL) {
+ printk(KERN_WARN "%s: inconsistent length field in "
+       "scatterlist\n", __FUNCTION__);
+ return -1;
+ }
+
+ to_capa  = sg->length;
+ copy_size = min_t(to_capa, from_rest);
+
+ to = page_to_virt(sg->page) + (sg->offset);
+ memcpy(to, from, copy_size);
+
+ from_rest  -= copy_size;
+ if (from_rest == 0) {
+ return 0;
+ }
+
+ sg++;
+ from += copy_size;
+ }
+
+ printk(KERN_WARN "%s: no space in scatterlist\n",
+       __FUNCTION__);
+ return -1;
+}
+
+static int __copy_from_sg(struct scatterlist *sg, unsigned int nr_sg,
+ void *buf, unsigned int buflen)
+{
+ void *from;
+ void *to = buf;
+ unsigned int from_rest;
+ unsigned int to_capa = buflen;
+ unsigned int copy_size;
+ unsigned int i;
+
+ for (i = 0; i < nr_sg; i++) {
+ if (sg->page == NULL) {
+ printk(KERN_WARN "%s: inconsistent length field in "
+       "scatterlist\n", __FUNCTION__);
+ return -1;
+ }
+
+ from_rest = sg->length;
+ if ((from_rest > 0) && (to_capa < from_rest)) {
+ printk(KERN_WARN
+       "%s: no space in destination buffer\n",
+       __FUNCTION__);
+ return -1;
+ }
+ copy_size = from_rest;
+
+ from = page_to_virt(sg->page) + (sg->offset);
+ memcpy(to, from, copy_size);
+
+ to_capa  -= copy_size;
+
+ sg++;
+ to += copy_size;
+ }
+
+ return 0;
+}
+
+
+static void scsiback_mk_sense_buffer(uint8_t *date, uint8_t key, uint8_t asc,
+ utint_8 asq)
+{
+ data[0] = 0x70;  /* fixed, current */
+ data[2] = key;
+ data[7] = 0xa;  /* implies 18 byte sense buffer */
+ data[12] = asc;
+ data[13] = asq;
+}
+
+
+
+/* tuning point*/
+#define VSCSIIF_RLUN_ARR_SZ 2048
+
+/* quoted scsi_debug.c/resp_report_luns() */
+static void __report_luns(pending_request_t *pending_req, void *data)
+{
+ struct vscsibk_info *info   = pending_req->info;
+ unsigned int        channel = pending_req->sdev->channel;
+ unsigned int        target  = pending_req->sdev->id;
+ unsigned char *cmd = (unsigned char *)pending_req->cmnd;
+
+ unsigned char rq_buff[VSCSIIF_RLUN_ARR_SZ];
+ unsigned char *sense_buf = pending_req->sense_buffer;
+ unsigned char alloc_len;
+ int select_report = (int)cmd[2];
+ int lun_cnt = 0;
+
+ struct v2p_entry *entry;
+ struct list_head *head = &(info->v2p_entry_lists);
+ unsigned long flags;
+
+ struct scsi_lun *one_lun;
+
+ alloc_len = cmd[9] + (cmd[8] << 8) + (cmd[7] << 16) + (cmd[6] << 24);
+ if ((alloc_len < 4) || (select_report != 0)) {
+ scsiback_mk_sense_buffer(pending_req->sense_buffer, ILLEGAL_REQUEST,
+ INVALID_FIELD_IN_CDB, 0);
+ pending_req->rslt = check_condition_result;
+ return;
+ }
+
+ memset(rq_buff, 0, VSCSIIF_RLUN_ARR_SZ);
+ __copy_from_sg(pending_req->sgl, pending_req->nr_segments,
+ rq_buff, VSCSIIF_RLUN_ARR_SZ);
+
+
+ rq_buff[2] = ((sizeof(struct scsi_lun) * num) >> 8) & 0xff;
+ rq_buff[3] = (sizeof(struct scsi_lun) * num) & 0xff;
+
+
+ one_lun = (struct scsi_lun *) &rq_buff[8];
+ spin_lock_irqsave(&info->v2p_lock, flags);
+ list_for_each_entry(entry, head, l) {
+ if ((entry->v.chn == channel) &&
+    (entry->v.tgt == target) {
+ lun = entry->v.lun;
+ upper = (lun >> 8) & 0x3f;
+ if (upper)
+ one_lun[lun_cnt].scsi_lun[0] = upper;
+ one_lun[lun_cnt].scsi_lun[1] = lun & 0xff;
+ lun_cnt++;
+ }
+ }
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+
+
+ lun_alloc = (unsigned char *)(one_lun + lun_cnt) - rq_buff;
+
+ return fill_from_dev_buffer(scp, rq_buff,
+    min((int)alloc_len, lun_alloc));
+}
+
+
+
+int __pre_do_emulation(pending_request_t *pending_req, void *data)
+{
+ uint8_t op_code = pending_req->cmnd[0];
+
+ if ((bitmap[op_code] & VSCSIIF_NEED_EMULATE_REQBUF) &&
+    pre_function[op_code] != NULL) {
+ pre_function[op_code](pending_req, data);
+ }
+
+ /*
+    0: no need for native driver call, so should return immediately.
+    1: non emulation or should call native driver
+       after modifing the request buffer.
+ */
+ return (bitmap[op_code] & VSCSIIF_NEED_CMD_EXEC);
+}
+
+void scsiback_rsp_emulation(pending_request_t *pending_req)
+{
+ uint8_t op_code = pending_req->cdb[0];
+
+ if ((bitmap[op_code] & VSCSIIF_NEED_EMULATE_RSPBUF) &&
+    post_function[op_code] != NULL) {
+ post_function[op_code](pending_req, NULL);
+ }
+
+ return;
+}
+
+
+void scsiback_req_emulation_or_cmdexec(pending_req_t *pending_req)
+{
+ if (__pre_do_emulation(pending_req, NULL))
+ scsiback_cmd_exec(pending_req);
+ else
+ scsiback_do_resp_with_sense(pending_req);
+}
diff -r 557a4a0a5eac -r 66faefe721eb drivers/xen/scsiback/interface.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/scsiback/interface.c Mon Jun 02 09:58:27 2008 +0100
@@ -0,0 +1,184 @@
+/*
+ * interface management.
+ *
+ * Copyright (c) 2008, FUJITSU Limited
+ *
+ * Based on the blkback driver code.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include "common.h"
+
+#include <xen/evtchn.h>
+#include <linux/kthread.h>
+
+
+static kmem_cache_t *scsiback_cachep;
+
+struct vscsibk_info *vscsibk_info_alloc(domid_t domid)
+{
+ struct vscsibk_info *info;
+
+ info = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL);
+ if (!info)
+ return ERR_PTR(-ENOMEM);
+
+ memset(info, 0, sizeof(*info));
+ info->domid = domid;
+ spin_lock_init(&info->ring_lock);
+ atomic_set(&info->refcnt, 1);
+ init_waitqueue_head(&info->wq);
+ init_waitqueue_head(&info->waiting_to_free);
+
+ return info;
+}
+
+static int map_frontend_page( struct vscsibk_info *info,
+ unsigned long ring_ref)
+{
+ struct gnttab_map_grant_ref op;
+ int err;
+
+ gnttab_set_map_op(&op, (unsigned long)info->ring_area->addr,
+ GNTMAP_host_map, ring_ref,
+ info->domid);
+
+ err = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, &op, 1);
+ BUG_ON(err);
+
+ if (op.status) {
+ printk(KERN_ERR "scsiback: Grant table operation failure !\n");
+ return op.status;
+ }
+
+ info->shmem_ref    = ring_ref;
+ info->shmem_handle = op.handle;
+
+ return 0;
+}
+
+static void unmap_frontend_page(struct vscsibk_info *info)
+{
+ struct gnttab_unmap_grant_ref op;
+ int err;
+
+ gnttab_set_unmap_op(&op, (unsigned long)info->ring_area->addr,
+ GNTMAP_host_map, info->shmem_handle);
+
+ err = HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1);
+ BUG_ON(err);
+
+}
+
+int scsiback_init_sring(struct vscsibk_info *info,
+ unsigned long ring_ref, unsigned int evtchn)
+{
+ struct vscsiif_sring *sring;
+ int err;
+
+ if (info->irq) {
+ printk(KERN_ERR "scsiback: Already connected through?\n");
+ return 0;
+ }
+
+ info->ring_area = alloc_vm_area(PAGE_SIZE);
+ if (!info)
+ return -ENOMEM;
+
+ err = map_frontend_page(info, ring_ref);
+ if (err)
+ goto free_vm;
+
+ sring = (struct vscsiif_sring *) info->ring_area->addr;
+ BACK_RING_INIT(&info->ring, sring, PAGE_SIZE);
+
+ err = bind_interdomain_evtchn_to_irqhandler(
+ info->domid, evtchn,
+ scsiback_intr, 0, "vscsiif-backend", info);
+
+ if (err < 0)
+ goto unmap_page;
+
+ info->irq = err;
+
+ return 0;
+
+unmap_page:
+ unmap_frontend_page(info);
+free_vm:
+ free_vm_area(info->ring_area);
+
+ return err;
+}
+
+void scsiback_disconnect(struct vscsibk_info *info)
+{
+ if (info->kthread) {
+ kthread_stop(info->kthread);
+ info->kthread = NULL;
+ }
+
+ atomic_dec(&info->refcnt);
+ wait_event(info->waiting_to_free, atomic_read(&info->refcnt) == 0);
+ atomic_inc(&info->refcnt);
+
+ if (info->irq) {
+ unbind_from_irqhandler(info->irq, info);
+ info->irq = 0;
+ }
+
+ if (info->ring.sring) {
+ unmap_frontend_page(info);
+ free_vm_area(info->ring_area);
+ info->ring.sring = NULL;
+ }
+}
+
+void scsiback_free(struct vscsibk_info *info)
+{
+ if (atomic_dec_and_test(&info->refcnt))
+ kmem_cache_free(scsiback_cachep, info);
+}
+
+int __init scsiback_interface_init(void)
+{
+ scsiback_cachep = kmem_cache_create("vscsiif_cache",
+ sizeof(struct vscsibk_info), 0, 0, NULL, NULL);
+ if (!scsiback_cachep) {
+ printk(KERN_ERR "scsiback: can't init scsi cache\n");
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+void __exit scsiback_interface_exit(void)
+{
+ kmem_cache_destroy(scsiback_cachep);
+}
diff -r 557a4a0a5eac -r 66faefe721eb drivers/xen/scsiback/scsiback.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/scsiback/scsiback.c Mon Jun 02 09:58:27 2008 +0100
@@ -0,0 +1,734 @@
+/*
+ * Xen SCSI backend driver
+ *
+ * Copyright (c) 2008, FUJITSU Limited
+ *
+ * Based on the blkback driver code.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <linux/spinlock.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <xen/balloon.h>
+#include <asm/hypervisor.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_eh.h>
+
+#include "common.h"
+
+
+#define  NO_ASYNC  1 /*!aync*/
+
+struct list_head pending_free;
+DEFINE_SPINLOCK(pending_free_lock);
+DECLARE_WAIT_QUEUE_HEAD(pending_free_wq);
+
+int vscsiif_reqs = VSCSIIF_BACK_MAX_PENDING_REQS;
+module_param_named(reqs, vscsiif_reqs, int, 0);
+MODULE_PARM_DESC(reqs, "Number of scsiback requests to allocate");
+
+
+#define SCSIBACK_INVALID_HANDLE (~0)
+
+static pending_req_t *pending_reqs;
+static struct page **pending_pages;
+static grant_handle_t *pending_grant_handles;
+
+static int vaddr_pagenr(pending_req_t *req, int seg)
+{
+ return (req - pending_reqs) * VSCSIIF_SG_TABLESIZE + seg;
+}
+
+static unsigned long vaddr(pending_req_t *req, int seg)
+{
+ unsigned long pfn = page_to_pfn(pending_pages[vaddr_pagenr(req, seg)]);
+ return (unsigned long)pfn_to_kaddr(pfn);
+}
+
+#define pending_handle(_req, _seg) \
+ (pending_grant_handles[vaddr_pagenr(_req, _seg)])
+
+
+static void fast_flush_area(pending_req_t *req)
+{
+ struct gnttab_unmap_grant_ref unmap[VSCSIIF_SG_TABLESIZE];
+ unsigned int i, invcount = 0;
+ grant_handle_t handle;
+ int err;
+
+ if (req->nr_segments) {
+ for (i = 0; i < req->nr_segments; i++) {
+ handle = pending_handle(req, i);
+ if (handle == SCSIBACK_INVALID_HANDLE)
+ continue;
+ gnttab_set_unmap_op(&unmap[i], vaddr(req, i),
+ GNTMAP_host_map, handle);
+ pending_handle(req, i) = SCSIBACK_INVALID_HANDLE;
+ invcount++;
+ }
+
+ err = HYPERVISOR_grant_table_op(
+ GNTTABOP_unmap_grant_ref, unmap, invcount);
+ BUG_ON(err);
+ kfree(req->sgl);
+ }
+
+ return;
+}
+
+
+static pending_req_t * alloc_req(struct vscsibk_info *info)
+{
+ pending_req_t *req = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&pending_free_lock, flags);
+ if (!list_empty(&pending_free)) {
+ req = list_entry(pending_free.next, pending_req_t, free_list);
+ list_del(&req->free_list);
+ }
+ spin_unlock_irqrestore(&pending_free_lock, flags);
+ return req;
+}
+
+
+static void free_req(pending_req_t *req)
+{
+ unsigned long flags;
+ int was_empty;
+
+ spin_lock_irqsave(&pending_free_lock, flags);
+ was_empty = list_empty(&pending_free);
+ list_add(&req->free_list, &pending_free);
+ spin_unlock_irqrestore(&pending_free_lock, flags);
+ if (was_empty)
+ wake_up(&pending_free_wq);
+}
+
+
+static void scsiback_notify_work(struct vscsibk_info *info)
+{
+ info->waiting_reqs = 1;
+ wake_up(&info->wq);
+}
+
+static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result,
+ pending_req_t *pending_req)
+{
+ vscsiif_response_t *ring_res;
+ struct vscsibk_info *info = pending_req->info;
+ int notify;
+ int more_to_do = 1;
+ unsigned long flags;
+
+ DPRINTK("%s\n",__FUNCTION__);
+
+ spin_lock_irqsave(&info->ring_lock, flags);
+
+ rmb();
+ ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt);
+ info->ring.rsp_prod_pvt++;
+
+ ring_res->rslt   = result;
+ ring_res->rqid   = pending_req->rqid;
+
+ if (sense_buffer != NULL) {
+ memcpy(ring_res->sense_buffer, sense_buffer,
+ VSCSIIF_SENSE_BUFFERSIZE);
+ ring_res->sense_len = VSCSIIF_SENSE_BUFFERSIZE;
+ } else {
+ ring_res->sense_len = 0;
+ }
+
+ RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify);
+ if (info->ring.rsp_prod_pvt == info->ring.req_cons) {
+ RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do);
+ } else if (RING_HAS_UNCONSUMED_REQUESTS(&info->ring)) {
+ more_to_do = 1;
+ }
+
+ spin_unlock_irqrestore(&info->ring_lock, flags);
+
+ if (more_to_do)
+ scsiback_notify_work(info);
+
+ if (notify)
+ notify_remote_via_irq(info->irq);
+
+ scsiback_put(pending_req->info);
+ free_req(pending_req);
+}
+
+#ifdef NO_ASYNC /*!async*/
+static void scsiback_cmd_done(struct request *req, int errors)
+{
+ pending_req_t *pending_req = req->end_io_data;
+ struct scsi_device *sdev = pending_req->sdev;
+ unsigned char *sense_buffer;
+
+ sense_buffer = req->sense;
+
+#else
+static void scsiback_cmd_done(void *data, char *sense_buffer,
+ int errors, int resid)
+{
+ pending_req_t *pending_req = data;
+ struct scsi_device *sdev = pending_req->sdev;
+
+ DPRINTK("%s\n",__FUNCTION__);
+#endif
+
+ if ((errors != 0) && (pending_req->cmnd[0] != TEST_UNIT_READY)) {
+
+ printk(KERN_ERR "scsiback: %d:%d:%d:%d ",sdev->host->host_no,
+ sdev->channel, sdev->id, sdev->lun);
+ printk(KERN_ERR "status = 0x%02x, message = 0x%02x, host = 0x%02x, driver = 0x%02x\n",
+ status_byte(errors), msg_byte(errors),
+ host_byte(errors), driver_byte(errors));
+
+ printk(KERN_ERR "scsiback: cmnd[0]=0x%02X nr_segments=%d\n",
+ pending_req->cmnd[0],
+ pending_req->nr_segments);
+
+ if (CHECK_CONDITION & status_byte(errors))
+ __scsi_print_sense("scsiback", sense_buffer, SCSI_SENSE_BUFFERSIZE);
+ }
+
+#if 0 /*SAMPLE CODING(tentative)*//*emulation*/
+ scsiback_rsp_emulation(pending_req);
+#endif
+ fast_flush_area(pending_req);
+ scsiback_do_resp_with_sense(sense_buffer, errors, pending_req);
+
+
+#ifdef NO_ASYNC /*!async*/
+ __blk_put_request(req->q, req);
+#endif
+}
+
+
+static int scsiback_gnttab_data_map(vscsiif_request_t *ring_req,
+ pending_req_t *pending_req)
+{
+ u32 flags;
+ int write;
+ int i, err = 0;
+ unsigned int data_len = 0;
+ struct gnttab_map_grant_ref map[VSCSIIF_SG_TABLESIZE];
+ struct vscsibk_info *info   = pending_req->info;
+
+ int data_dir = (int)pending_req->sc_data_direction;
+ unsigned int nr_segments = (unsigned int)pending_req->nr_segments;
+
+ write = (data_dir == DMA_TO_DEVICE);
+
+ if (nr_segments) {
+ /* free of (sgl) in fast_flush_area()*/
+ pending_req->sgl = kmalloc(sizeof(struct scatterlist) * nr_segments,
+ GFP_KERNEL);
+ if (!pending_req->sgl) {
+ printk(KERN_ERR "scsiback: %s: kmalloc() error.\n", __FUNCTION__);
+ return -ENOMEM;
+ }
+
+ for (i = 0; i < nr_segments; i++) {
+ flags = GNTMAP_host_map;
+ if (write)
+ flags |= GNTMAP_readonly;
+ gnttab_set_map_op(&map[i], vaddr(pending_req, i), flags,
+ ring_req->seg[i].gref,
+ info->domid);
+ }
+
+ err = HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, map, nr_segments);
+ BUG_ON(err);
+
+ for (i = 0; i < nr_segments; i++) {
+ if (unlikely(map[i].status != 0)) {
+ printk(KERN_ERR "scsiback: invalid buffer -- could not remap it\n");
+ map[i].handle = SCSIBACK_INVALID_HANDLE;
+ err |= 1;
+ }
+
+ pending_handle(pending_req, i) = map[i].handle;
+
+ if (err)
+ continue;
+
+ set_phys_to_machine(__pa(vaddr(
+ pending_req, i)) >> PAGE_SHIFT,
+ FOREIGN_FRAME(map[i].dev_bus_addr >> PAGE_SHIFT));
+
+ pending_req->sgl[i].page   = virt_to_page(vaddr(pending_req, i));
+ pending_req->sgl[i].offset = ring_req->seg[i].offset;
+ pending_req->sgl[i].length = ring_req->seg[i].length;
+ data_len += pending_req->sgl[i].length;
+ }
+
+ if (err)
+ goto fail_flush;
+ }
+
+ pending_req->request_bufflen = data_len;
+
+ return 0;
+
+fail_flush:
+ fast_flush_area(pending_req);
+ return -ENOMEM;
+}
+
+
+#ifdef NO_ASYNC /*!async*/
+
+/* quoted scsi_lib.c/scsi_merge_bio */
+static int scsiback_merge_bio(struct request *rq, struct bio *bio)
+{
+ struct request_queue *q = rq->q;
+
+ bio->bi_flags &= ~(1 << BIO_SEG_VALID);
+ if (rq_data_dir(rq) == WRITE)
+ bio->bi_rw |= (1 << BIO_RW);
+
+ blk_queue_bounce(q, &bio);
+
+ if (!rq->bio)
+ blk_rq_bio_prep(q, rq, bio);
+ else if (!q->back_merge_fn(q, rq, bio))
+ return -EINVAL;
+ else {
+ rq->biotail->bi_next = bio;
+ rq->biotail          = bio;
+ rq->hard_nr_sectors += bio_sectors(bio);
+ rq->nr_sectors       = rq->hard_nr_sectors;
+ }
+
+ return 0;
+}
+
+
+/* quoted scsi_lib.c/scsi_bi_endio */
+static int scsiback_bi_endio(struct bio *bio, unsigned int bytes_done, int error)
+{
+ if (bio->bi_size)
+ return 1;
+
+ bio_put(bio);
+ return 0;
+}
+
+
+
+/* quoted scsi_lib.c/scsi_req_map_sg . */
+static int requset_map_sg(struct request *rq, pending_req_t *pending_req, unsigned int count)
+{
+ struct request_queue *q = rq->q;
+ int nr_pages;
+ unsigned int nsegs = count;
+
+ unsigned int data_len = 0, len, bytes, off;
+ struct page *page;
+ struct bio *bio = NULL;
+ int i, err, nr_vecs = 0;
+
+ for (i = 0; i < nsegs; i++) {
+ page = pending_req->sgl[i].page;
+ off = (unsigned int)pending_req->sgl[i].offset;
+ len = (unsigned int)pending_req->sgl[i].length;
+ data_len += len;
+
+ nr_pages = (len + off + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ while (len > 0) {
+ bytes = min_t(unsigned int, len, PAGE_SIZE - off);
+
+ if (!bio) {
+ nr_vecs = min_t(int, BIO_MAX_PAGES, nr_pages);
+ nr_pages -= nr_vecs;
+ bio = bio_alloc(GFP_KERNEL, nr_vecs);
+ if (!bio) {
+ err = -ENOMEM;
+ goto free_bios;
+ }
+ bio->bi_end_io = scsiback_bi_endio;
+ }
+
+ if (bio_add_pc_page(q, bio, page, bytes, off) !=
+ bytes) {
+ bio_put(bio);
+ err = -EINVAL;
+ goto free_bios;
+ }
+
+ if (bio->bi_vcnt >= nr_vecs) {
+ err = scsiback_merge_bio(rq, bio);
+ if (err) {
+ bio_endio(bio, bio->bi_size, 0);
+ goto free_bios;
+ }
+ bio = NULL;
+ }
+
+ page++;
+ len -= bytes;
+ off = 0;
+ }
+ }
+
+ rq->buffer   = rq->data = NULL;
+ rq->data_len = data_len;
+
+ return 0;
+
+free_bios:
+ while ((bio = rq->bio) != NULL) {
+ rq->bio = bio->bi_next;
+ /*
+ * call endio instead of bio_put incase it was bounced
+ */
+ bio_endio(bio, bio->bi_size, 0);
+ }
+
+ return err;
+}
+
+#endif
+
+void scsiback_cmd_exec(pending_req_t *pending_req)
+{
+ int err;
+
+ int cmd_len  = (int)pending_req->cmd_len;
+ int data_dir = (int)pending_req->sc_data_direction;
+ unsigned int nr_segments = (unsigned int)pending_req->nr_segments;
+ unsigned int timeout;
+#ifdef NO_ASYNC /*!async*/
+ struct request *rq;
+ int write;
+#else
+ unsigned int data_len = pending_req->request_bufflen;
+#endif
+
+ DPRINTK("%s\n",__FUNCTION__);
+
+ /* because it doesn't timeout backend earlier than frontend.*/
+ if (pending_req->timeout_per_command)
+ timeout = (pending_req->timeout_per_command * HZ * 2);
+ else
+ timeout = VSCSIIF_TIMEOUT;
+
+#ifdef NO_ASYNC /*!async*/
+ err = 0;
+ write = (data_dir == DMA_TO_DEVICE);
+ rq = blk_get_request(pending_req->sdev->request_queue, write, GFP_KERNEL);
+
+ rq->flags  |= REQ_BLOCK_PC;
+ rq->cmd_len = cmd_len;
+ memcpy(rq->cmd, pending_req->cmnd, cmd_len);
+
+ memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE);
+ rq->sense       = pending_req->sense_buffer;
+ rq->sense_len = 0;
+
+ rq->retries   = 0;
+ rq->timeout   = timeout;
+ rq->end_io_data = pending_req;
+
+ if (nr_segments) {
+
+ if (requset_map_sg(rq, pending_req, nr_segments)) {
+ printk(KERN_ERR "scsiback: SG Request Map Error\n");
+ return;
+ }
+ }
+
+ blk_execute_rq_nowait(rq->q, NULL, rq, 1, scsiback_cmd_done);
+
+#else   /*async*/
+ /* not allowed to retry in backend.                   */
+ /* timeout of backend is longer than that of brontend.*/
+ err = scsi_execute_async(pending_req->sdev, &(pending_req->cmnd[0]),
+ cmd_len, data_dir, &(pending_req->sgl[0]), data_len, nr_segments, timeout, 0,
+ pending_req, scsiback_cmd_done, GFP_ATOMIC);
+
+#endif /*!async*/
+
+ if (err)
+ scsiback_do_resp_with_sense(NULL, (DRIVER_ERROR << 24), pending_req);
+
+ return ;
+}
+
+
+static void scsiback_device_reset_exec(pending_req_t *pending_req)
+{
+ struct vscsibk_info *info = pending_req->info;
+ int err;
+ struct scsi_device *sdev = pending_req->sdev;
+
+ scsiback_get(info);
+
+ err = scsi_reset_provider(sdev, SCSI_TRY_RESET_DEVICE);
+
+ scsiback_do_resp_with_sense(NULL, err, pending_req);
+
+ notify_remote_via_irq(info->irq);
+ return;
+}
+
+
+irqreturn_t scsiback_intr(int irq, void *dev_id, struct pt_regs *regs)
+{
+ scsiback_notify_work((struct vscsibk_info *)dev_id);
+ return IRQ_HANDLED;
+}
+
+static int prepare_pending_reqs(struct vscsibk_info *info,
+ vscsiif_request_t *ring_req, pending_req_t *pending_req)
+{
+ struct scsi_device *sdev;
+ struct ids_tuple vir;
+ int err = -EINVAL;
+
+ DPRINTK("%s\n",__FUNCTION__);
+
+ pending_req->rqid       = ring_req->rqid;
+ pending_req->act        = ring_req->act;
+
+ pending_req->info       = info;
+
+ vir.chn = ring_req->channel;
+ vir.tgt = ring_req->id;
+ vir.lun = ring_req->lun;
+
+ sdev = scsiback_do_translation(info, &vir);
+ if (!sdev) {
+ pending_req->sdev = NULL;
+ printk(KERN_ERR "scsiback: doesn't exist.\n");
+ err = -ENODEV;
+ goto invald_value;
+ }
+ pending_req->sdev = sdev;
+
+ /* request range check from frontend */
+ if ((ring_req->sc_data_direction != DMA_BIDIRECTIONAL) &&
+ (ring_req->sc_data_direction != DMA_TO_DEVICE) &&
+ (ring_req->sc_data_direction != DMA_FROM_DEVICE) &&
+ (ring_req->sc_data_direction != DMA_NONE)) {
+ printk(KERN_ERR "scsiback: invalid parameter data_dir = %d\n",
+ ring_req->sc_data_direction);
+ err = -EINVAL;
+ goto invald_value;
+ }
+
+ if (ring_req->nr_segments > VSCSIIF_SG_TABLESIZE) {
+ printk(KERN_ERR "scsiback: invalid parameter nr_seg = %d\n",
+ ring_req->nr_segments);
+ err = -EINVAL;
+ goto invald_value;
+ }
+ pending_req->nr_segments = ring_req->nr_segments;
+
+ if (ring_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
+ printk(KERN_ERR "scsiback: invalid parameter cmd_len = %d\n",
+ ring_req->cmd_len);
+ err = -EINVAL;
+ goto invald_value;
+ }
+ memcpy(pending_req->cmnd, ring_req->cmnd, ring_req->cmd_len);
+ pending_req->cmd_len = ring_req->cmd_len;
+
+ pending_req->sc_data_direction = ring_req->sc_data_direction;
+ pending_req->timeout_per_command = ring_req->timeout_per_command;
+
+ if(scsiback_gnttab_data_map(ring_req, pending_req)) {
+ printk(KERN_ERR "scsiback: invalid buffer\n");
+ err = -EINVAL;
+ goto invald_value;
+ }
+
+ return 0;
+
+invald_value:
+ return err;
+}
+
+
+static int scsiback_do_cmd_fn(struct vscsibk_info *info)
+{
+ struct vscsiif_back_ring *ring = &info->ring;
+ vscsiif_request_t  *ring_req;
+
+ pending_req_t *pending_req;
+ RING_IDX rc, rp;
+ int err, more_to_do = 0;
+
+ DPRINTK("%s\n",__FUNCTION__);
+
+ rc = ring->req_cons;
+ rp = ring->sring->req_prod;
+ rmb();
+
+ while ((rc != rp)) {
+ if (RING_REQUEST_CONS_OVERFLOW(ring, rc))
+ break;
+ pending_req = alloc_req(info);
+ if (NULL == pending_req) {
+ more_to_do = 1;
+ break;
+ }
+
+ ring_req = RING_GET_REQUEST(ring, rc);
+ ring->req_cons = ++rc;
+
+ scsiback_get(info);
+ err = prepare_pending_reqs(info, ring_req,
+ pending_req);
+ if (err == -EINVAL) {
+ scsiback_do_resp_with_sense(NULL, (DRIVER_ERROR << 24),
+ pending_req);
+ continue;
+ } else if (err == -ENODEV) {
+ scsiback_do_resp_with_sense(NULL, (DID_NO_CONNECT << 16),
+ pending_req);
+ }
+
+ if (pending_req->act == VSCSIIF_ACT_SCSI_CDB) {
+#if 0 /*SAMPLE CODING(tentative)*//*emulation*/
+ scsiback_req_emulation_or_through(pending_req);
+#else
+ scsiback_cmd_exec(pending_req);
+#endif
+ } else if (pending_req->act == VSCSIIF_ACT_SCSI_RESET) {
+ scsiback_device_reset_exec(pending_req);
+ } else {
+ printk(KERN_ERR "scsiback: invalid parameter for request\n");
+ scsiback_do_resp_with_sense(NULL, (DRIVER_ERROR << 24),
+ pending_req);
+ continue;
+ }
+ }
+
+ if (RING_HAS_UNCONSUMED_REQUESTS(ring))
+ more_to_do = 1;
+
+ return more_to_do;
+}
+
+
+int scsiback_schedule(void *data)
+{
+ struct vscsibk_info *info = (struct vscsibk_info *)data;
+
+ DPRINTK("%s\n",__FUNCTION__);
+
+ scsiback_get(info);
+
+ while (!kthread_should_stop()) {
+ wait_event_interruptible(
+ info->wq,
+ info->waiting_reqs || kthread_should_stop());
+ wait_event_interruptible(
+ pending_free_wq,
+ !list_empty(&pending_free) || kthread_should_stop());
+
+ info->waiting_reqs = 0;
+ smp_mb();
+
+ if (scsiback_do_cmd_fn(info))
+ info->waiting_reqs = 1;
+ }
+
+ info->kthread = NULL;
+ scsiback_put(info);
+
+ return 0;
+}
+
+
+static int __init scsiback_init(void)
+{
+ int i, mmap_pages;
+
+ if (!is_running_on_xen())
+ return -ENODEV;
+
+ mmap_pages = vscsiif_reqs * VSCSIIF_SG_TABLESIZE;
+
+ pending_reqs          = kmalloc(sizeof(pending_reqs[0]) *
+ vscsiif_reqs, GFP_KERNEL);
+ pending_grant_handles = kmalloc(sizeof(pending_grant_handles[0]) *
+ mmap_pages, GFP_KERNEL);
+ pending_pages         = alloc_empty_pages_and_pagevec(mmap_pages);
+
+ if (!pending_reqs || !pending_grant_handles || !pending_pages)
+ goto out_of_memory;
+
+ for (i = 0; i < mmap_pages; i++)
+ pending_grant_handles[i] = SCSIBACK_INVALID_HANDLE;
+
+ if (scsiback_interface_init() < 0)
+ goto out_of_memory;
+
+ memset(pending_reqs, 0, sizeof(pending_reqs));
+ INIT_LIST_HEAD(&pending_free);
+
+ for (i = 0; i < vscsiif_reqs; i++)
+ list_add_tail(&pending_reqs[i].free_list, &pending_free);
+
+ if (scsiback_xenbus_init())
+ goto out_of_memory;
+
+ return 0;
+
+out_of_memory:
+ kfree(pending_reqs);
+ kfree(pending_grant_handles);
+ free_empty_pages_and_pagevec(pending_pages, mmap_pages);
+ printk(KERN_ERR "scsiback: %s: out of memory\n", __FUNCTION__);
+ return -ENOMEM;
+}
+
+static void __exit scsiback_exit(void)
+{
+ scsiback_xenbus_unregister();
+ scsiback_interface_exit();
+ kfree(pending_reqs);
+ kfree(pending_grant_handles);
+ free_empty_pages_and_pagevec(pending_pages, (vscsiif_reqs * VSCSIIF_SG_TABLESIZE));
+
+}
+
+module_init(scsiback_init);
+module_exit(scsiback_exit);
+
+MODULE_DESCRIPTION("Xen SCSI backend driver");
+MODULE_LICENSE("Dual BSD/GPL");
diff -r 557a4a0a5eac -r 66faefe721eb drivers/xen/scsiback/translate.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/scsiback/translate.c Mon Jun 02 09:58:27 2008 +0100
@@ -0,0 +1,166 @@
+/*
+ * Xen SCSI backend driver
+ *
+ * Copyright (c) 2008, FUJITSU Limited
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <linux/list.h>
+#include <linux/gfp.h>
+
+#include "common.h"
+
+/*
+  Initialize the translation entry list
+*/
+void scsiback_init_translation_table(struct vscsibk_info *info)
+{
+ INIT_LIST_HEAD(&info->v2p_entry_lists);
+ spin_lock_init(&info->v2p_lock);
+}
+
+
+/*
+  Add a new translation entry
+*/
+int scsiback_add_translation_entry(struct vscsibk_info *info,
+ struct scsi_device *sdev, struct ids_tuple *v)
+{
+ int err = 0;
+ struct v2p_entry *entry;
+ struct v2p_entry *new;
+ struct list_head *head = &(info->v2p_entry_lists);
+ unsigned long flags;
+
+ spin_lock_irqsave(&info->v2p_lock, flags);
+
+ /* Check double assignment to identical virtual ID */
+ list_for_each_entry(entry, head, l) {
+ if ((entry->v.chn == v->chn) &&
+    (entry->v.tgt == v->tgt) &&
+    (entry->v.lun == v->lun)) {
+ printk(KERN_WARNING "scsiback: Virtual ID is already used. "
+       "Assignment was not performed.\n");
+ err = -EEXIST;
+ goto out;
+ }
+
+ }
+
+ /* Create a new translation entry and add to the list */
+ if ((new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL)) == NULL) {
+ printk(KERN_ERR "scsiback: %s: kmalloc() error.\n", __FUNCTION__);
+ err = -ENOMEM;
+ goto out;
+ }
+ new->v = *v;
+ new->sdev = sdev;
+ list_add(&new->l, head);
+
+out:
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+ return err;
+}
+
+
+/*
+  Delete the translation entry specfied
+*/
+int scsiback_del_translation_entry(struct vscsibk_info *info,
+ struct ids_tuple *v)
+{
+ struct v2p_entry *entry;
+ struct list_head *head = &(info->v2p_entry_lists);
+ unsigned long flags;
+
+ spin_lock_irqsave(&info->v2p_lock, flags);
+ /* Find out the translation entry specified */
+ list_for_each_entry(entry, head, l) {
+ if ((entry->v.chn == v->chn) &&
+    (entry->v.tgt == v->tgt) &&
+    (entry->v.lun == v->lun)) {
+ goto found;
+ }
+ }
+
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+ return 0;
+
+found:
+ /* Delete the translation entry specfied */
+ list_del(&entry->l);
+ kfree(entry);
+
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+ return 0;
+}
+
+
+/*
+  Perform virtual to physical translation
+*/
+struct scsi_device *scsiback_do_translation(struct vscsibk_info *info,
+ struct ids_tuple *v)
+{
+ struct v2p_entry *entry;
+ struct list_head *head = &(info->v2p_entry_lists);
+ struct scsi_device *sdev = NULL;
+ unsigned long flags;
+
+ spin_lock_irqsave(&info->v2p_lock, flags);
+ list_for_each_entry(entry, head, l) {
+ if ((entry->v.chn == v->chn) &&
+    (entry->v.tgt == v->tgt) &&
+    (entry->v.lun == v->lun)) {
+ sdev = entry->sdev;
+ goto out;
+ }
+ }
+out:
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+ return sdev;
+}
+
+
+/*
+  Release the translation entry specfied
+*/
+void scsiback_release_translation_entry(struct vscsibk_info *info)
+{
+ struct v2p_entry *entry, *tmp;
+ struct list_head *head = &(info->v2p_entry_lists);
+ unsigned long flags;
+
+ spin_lock_irqsave(&info->v2p_lock, flags);
+ list_for_each_entry_safe(entry, tmp, head, l) {
+ list_del(&entry->l);
+ kfree(entry);
+ }
+
+ spin_unlock_irqrestore(&info->v2p_lock, flags);
+ return;
+
+}
diff -r 557a4a0a5eac -r 66faefe721eb drivers/xen/scsiback/xenbus.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/drivers/xen/scsiback/xenbus.c Mon Jun 02 09:58:27 2008 +0100
@@ -0,0 +1,365 @@
+/*
+ * Xen SCSI backend driver
+ *
+ * Copyright (c) 2008, FUJITSU Limited
+ *
+ * Based on the blkback driver code.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <stdarg.h>
+#include <linux/module.h>
+#include <linux/kthread.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_device.h>
+
+#include "common.h"
+
+struct backend_info
+{
+ struct xenbus_device *dev;
+ struct vscsibk_info *info;
+};
+
+
+static int __vscsiif_name(struct backend_info *be, char *buf)
+{
+ struct xenbus_device *dev = be->dev;
+ unsigned int domid, id;
+
+ sscanf(dev->nodename, "backend/vscsi/%u/%u", &domid, &id);
+ snprintf(buf, TASK_COMM_LEN, "vscsi.%u.%u", be->info->domid, id);
+
+ return 0;
+}
+
+static int scsiback_map(struct backend_info *be)
+{
+ struct xenbus_device *dev = be->dev;
+ unsigned long ring_ref;
+ unsigned int evtchn;
+ int err;
+ char name[TASK_COMM_LEN];
+
+ err = xenbus_gather(XBT_NIL, dev->otherend,
+ "ring-ref", "%lu", &ring_ref,
+ "event-channel", "%u", &evtchn, NULL);
+ if (err) {
+ xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend);
+ return err;
+ }
+
+ err = scsiback_init_sring(be->info, ring_ref, evtchn);
+ if (err)
+ return err;
+
+ err = __vscsiif_name(be, name);
+ if (err) {
+ xenbus_dev_error(dev, err, "get scsiback dev name");
+ return err;
+ }
+
+ be->info->kthread = kthread_run(scsiback_schedule, be->info, name);
+ if (IS_ERR(be->info->kthread)) {
+ err = PTR_ERR(be->info->kthread);
+ be->info->kthread = NULL;
+ xenbus_dev_error(be->dev, err, "start vscsiif");
+ return err;
+ }
+
+ return 0;
+}
+
+
+struct scsi_device *scsiback_get_scsi_device(struct ids_tuple *phy)
+{
+ struct Scsi_Host *shost;
+ struct scsi_device *sdev = NULL;
+
+ shost = scsi_host_lookup(phy->hst);
+ if (IS_ERR(shost)) {
+ printk(KERN_ERR "scsiback: host%d doesn't exist.\n",
+ phy->hst);
+ goto invald_value;
+ }
+ sdev   = scsi_device_lookup(shost, phy->chn, phy->tgt, phy->lun);
+ if (!sdev) {
+ printk(KERN_ERR "scsiback: %d:%d:%d:%d doesn't exist.\n",
+ phy->hst, phy->chn, phy->tgt, phy->lun);
+ goto invald_value;
+ }
+
+invald_value:
+ return (sdev);
+}
+
+#define VSCSIBACK_OP_ADD_OR_DEL_LUN 1
+
+static void scsiback_do_lun_hotplug(struct backend_info *be, int op)
+{
+ int i, err = 0;
+ struct ids_tuple phy, vir;
+ int device_state;
+ char str[64], state_str[64];
+ char **dir;
+ unsigned int dir_n = 0;
+ struct xenbus_device *dev = be->dev;
+ struct scsi_device *sdev;
+ struct xenbus_transaction xbt;
+
+
+ err = xenbus_transaction_start(&xbt);
+ if (err) {
+ xenbus_dev_fatal(dev, err, "starting transaction");
+ }
+
+ dir = xenbus_directory(xbt, dev->nodename, "vscsi-devs", &dir_n);
+ if (IS_ERR(dir))
+ return;
+
+ for (i = 0; i < dir_n; i++) {
+
+ /* read status */
+ snprintf(state_str, sizeof(state_str), "vscsi-devs/%s/state", dir[i]);
+ err = xenbus_scanf(xbt, dev->nodename, state_str, "%u",
+ &device_state);
+ if (XENBUS_EXIST_ERR(err))
+ continue;
+
+ /* physical SCSI device */
+ snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", dir[i]);
+ err = xenbus_scanf(xbt, dev->nodename, str,
+ "%u:%u:%u:%u", &phy.hst, &phy.chn, &phy.tgt, &phy.lun);
+ if (XENBUS_EXIST_ERR(err)) {
+ xenbus_printf(xbt, dev->nodename, state_str,
+ "%d", XenbusStateClosing);
+ continue;
+ }
+
+ /* virtual SCSI device */
+ snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", dir[i]);
+ err = xenbus_scanf(xbt, dev->nodename, str,
+ "%u:%u:%u:%u", &vir.hst, &vir.chn, &vir.tgt, &vir.lun);
+ if (XENBUS_EXIST_ERR(err)) {
+ xenbus_printf(xbt, dev->nodename, state_str,
+ "%d", XenbusStateClosing);
+ continue;
+ }
+
+ switch (op) {
+ case VSCSIBACK_OP_ADD_OR_DEL_LUN:
+ if (device_state == XenbusStateInitialising) {
+ sdev = scsiback_get_scsi_device(&phy);
+ if (!sdev) {
+ xenbus_printf(xbt, dev->nodename, state_str,
+ "%d", XenbusStateClosing);
+ } else {
+ err = scsiback_add_translation_entry(be->info, sdev, &vir);
+ if (!err) {
+ xenbus_printf(xbt, dev->nodename, state_str,
+ "%d", XenbusStateInitialised);
+ } else {
+ xenbus_printf(xbt, dev->nodename, state_str,
+ "%d", XenbusStateClosing);
+ }
+ }
+ }
+
+ if (device_state == XenbusStateClosing) {
+ err = scsiback_del_translation_entry(be->info, &vir);
+ if (err)
+ goto fail;
+ else {
+ xenbus_printf(xbt, dev->nodename, state_str,
+ "%d", XenbusStateClosed);
+ }
+ }
+
+ break;
+ /*When it is necessary, processing is added here.*/
+ default:
+ break;
+ }
+ }
+
+ xenbus_transaction_end(xbt, 0);
+ kfree(dir);
+ return ;
+fail :
+ xenbus_transaction_end(xbt, 1);
+ kfree(dir);
+ xenbus_dev_fatal(dev, err, "read or write %s ", str);
+ return;
+}
+
+
+static void scsiback_frontend_changed(struct xenbus_device *dev,
+ enum xenbus_state frontend_state)
+{
+ struct backend_info *be = dev->dev.driver_data;
+ int err;
+
+ switch (frontend_state) {
+ case XenbusStateInitialising:
+ break;
+ case XenbusStateInitialised:
+ err = scsiback_map(be);
+ if (err)
+ break;
+
+ scsiback_do_lun_hotplug(be, VSCSIBACK_OP_ADD_OR_DEL_LUN);
+ err = xenbus_switch_state(dev, XenbusStateConnected);
+ if (err)
+ xenbus_dev_fatal(dev, err, "switching to Connected state",
+ dev->nodename);
+ break;
+ case XenbusStateConnected:
+ if (dev->state == XenbusStateConnected)
+ break;
+
+ err = xenbus_switch_state(dev, XenbusStateConnected);
+ if (err)
+ xenbus_dev_fatal(dev, err, "switching to Connected state",
+ dev->nodename);
+ break;
+
+ case XenbusStateClosing:
+ scsiback_disconnect(be->info);
+ xenbus_switch_state(dev, XenbusStateClosing);
+ break;
+
+ case XenbusStateClosed:
+ xenbus_switch_state(dev, XenbusStateClosed);
+ if (xenbus_dev_is_online(dev))
+ break;
+
+ case XenbusStateReconfiguring:
+ scsiback_do_lun_hotplug(be, VSCSIBACK_OP_ADD_OR_DEL_LUN);
+ err = xenbus_switch_state(dev, XenbusStateReconfigured);
+ if (err)
+ xenbus_dev_fatal(dev, err, "switching to Reconfigured state",
+ dev->nodename);
+ break;
+
+ case XenbusStateUnknown:
+ device_unregister(&dev->dev);
+ break;
+ default:
+ xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
+ frontend_state);
+ break;
+ }
+}
+
+
+static int scsiback_remove(struct xenbus_device *dev)
+{
+ struct backend_info *be = dev->dev.driver_data;
+
+ if (be->info) {
+ scsiback_disconnect(be->info);
+ scsiback_release_translation_entry(be->info);
+ scsiback_free(be->info);
+ be->info = NULL;
+ }
+
+ kfree(be);
+ dev->dev.driver_data = NULL;
+
+ return 0;
+}
+
+
+static int scsiback_probe(struct xenbus_device *dev,
+   const struct xenbus_device_id *id)
+{
+ int err;
+
+ struct backend_info *be = kzalloc(sizeof(struct backend_info),
+  GFP_KERNEL);
+
+ DPRINTK("%p %d\n", dev, dev->otherend_id);
+
+ if (!be) {
+ xenbus_dev_fatal(dev, -ENOMEM,
+ "allocating backend structure");
+ return -ENOMEM;
+ }
+ be->dev = dev;
+ dev->dev.driver_data = be;
+
+ be->info = vscsibk_info_alloc(dev->otherend_id);
+ if (IS_ERR(be->info)) {
+ err = PTR_ERR(be->info);
+ be->info = NULL;
+ xenbus_dev_fatal(dev, err, "creating scsihost interface");
+ goto fail;
+ }
+
+ be->info->dev = dev;
+ be->info->irq = 0;
+
+ scsiback_init_translation_table(be->info);
+
+ err = xenbus_switch_state(dev, XenbusStateInitWait);
+ if (err)
+ goto fail;
+
+ return 0;
+
+
+fail:
+ printk(KERN_WARNING "scsiback: %s failed\n",__FUNCTION__);
+ scsiback_remove(dev);
+
+ return err;
+}
+
+
+static struct xenbus_device_id scsiback_ids[] = {
+ { "vscsi" },
+ { "" }
+};
+
+static struct xenbus_driver scsiback = {
+ .name = "vscsi",
+ .owner = THIS_MODULE,
+ .ids = scsiback_ids,
+ .probe = scsiback_probe,
+ .remove = scsiback_remove,
+ .otherend_changed = scsiback_frontend_changed
+};
+
+int scsiback_xenbus_init(void)
+{
+ return xenbus_register_backend(&scsiback);
+}
+
+void scsiback_xenbus_unregister(void)
+{
+ xenbus_unregister_driver(&scsiback);
+}

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