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tgt: removal 

Now that the ibmvstgt driver as the only user of scsi_tgt is gone, the
scsi_tgt kernel module, the CONFIG_SCSI_TGT, CONFIG_SCSI_SRP_TGT_ATTRS and
CONFIG_SCSI_FC_TGT_ATTRS kbuild variable, the scsi_host_template
transfer_response method are no longer needed.

[hch: minor updates to the current tree, changelog update]

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
This commit is contained in:
Bart Van Assche 2014-04-15 12:26:52 +02:00 коммит произвёл Christoph Hellwig
Родитель f6667938cf
Коммит 0664652513
12 изменённых файлов: 0 добавлений и 1333 удалений
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7
drivers/scsi/Kconfig
Просмотреть файл

@ -304,13 +304,6 @@ config SCSI_SRP_ATTRS
If you wish to export transport-specific information about
each attached SRP device to sysfs, say Y.
config SCSI_SRP_TGT_ATTRS
bool "SCSI target support for SRP Transport Attributes"
depends on SCSI_SRP_ATTRS
depends on SCSI_TGT = y || SCSI_TGT = SCSI_SRP_ATTRS
help
If you want to use SCSI target mode drivers enable this option.
endmenu
menuconfig SCSI_LOWLEVEL

3
drivers/scsi/Makefile
Просмотреть файл

@ -20,7 +20,6 @@ CFLAGS_gdth.o = # -DDEBUG_GDTH=2 -D__SERIAL__ -D__COM2__ -DGDTH_STATISTICS
obj-$(CONFIG_PCMCIA) += pcmcia/
obj-$(CONFIG_SCSI) += scsi_mod.o
obj-$(CONFIG_SCSI_TGT) += scsi_tgt.o
obj-$(CONFIG_RAID_ATTRS) += raid_class.o
@ -171,8 +170,6 @@ scsi_mod-$(CONFIG_PM) += scsi_pm.o
hv_storvsc-y := storvsc_drv.o
scsi_tgt-y += scsi_tgt_lib.o scsi_tgt_if.o
sd_mod-objs := sd.o
sd_mod-$(CONFIG_BLK_DEV_INTEGRITY) += sd_dif.o

399
drivers/scsi/scsi_tgt_if.c
Просмотреть файл

@ -1,399 +0,0 @@
/*
* SCSI target kernel/user interface functions
*
* Copyright (C) 2005 FUJITA Tomonori <tomof@acm.org>
* Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu>
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/miscdevice.h>
#include <linux/gfp.h>
#include <linux/file.h>
#include <linux/export.h>
#include <net/tcp.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tgt.h>
#include <scsi/scsi_tgt_if.h>
#include <asm/cacheflush.h>
#include "scsi_tgt_priv.h"
#if TGT_RING_SIZE < PAGE_SIZE
# define TGT_RING_SIZE PAGE_SIZE
#endif
#define TGT_RING_PAGES (TGT_RING_SIZE >> PAGE_SHIFT)
#define TGT_EVENT_PER_PAGE (PAGE_SIZE / sizeof(struct tgt_event))
#define TGT_MAX_EVENTS (TGT_EVENT_PER_PAGE * TGT_RING_PAGES)
struct tgt_ring {
u32 tr_idx;
unsigned long tr_pages[TGT_RING_PAGES];
spinlock_t tr_lock;
};
/* tx_ring : kernel->user, rx_ring : user->kernel */
static struct tgt_ring tx_ring, rx_ring;
static DECLARE_WAIT_QUEUE_HEAD(tgt_poll_wait);
static inline void tgt_ring_idx_inc(struct tgt_ring *ring)
{
if (ring->tr_idx == TGT_MAX_EVENTS - 1)
ring->tr_idx = 0;
else
ring->tr_idx++;
}
static struct tgt_event *tgt_head_event(struct tgt_ring *ring, u32 idx)
{
u32 pidx, off;
pidx = idx / TGT_EVENT_PER_PAGE;
off = idx % TGT_EVENT_PER_PAGE;
return (struct tgt_event *)
(ring->tr_pages[pidx] + sizeof(struct tgt_event) * off);
}
static int tgt_uspace_send_event(u32 type, struct tgt_event *p)
{
struct tgt_event *ev;
struct tgt_ring *ring = &tx_ring;
unsigned long flags;
int err = 0;
spin_lock_irqsave(&ring->tr_lock, flags);
ev = tgt_head_event(ring, ring->tr_idx);
if (!ev->hdr.status)
tgt_ring_idx_inc(ring);
else
err = -BUSY;
spin_unlock_irqrestore(&ring->tr_lock, flags);
if (err)
return err;
memcpy(ev, p, sizeof(*ev));
ev->hdr.type = type;
mb();
ev->hdr.status = 1;
flush_dcache_page(virt_to_page(ev));
wake_up_interruptible(&tgt_poll_wait);
return 0;
}
int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, u64 itn_id,
struct scsi_lun *lun, u64 tag)
{
struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd);
struct tgt_event ev;
int err;
memset(&ev, 0, sizeof(ev));
ev.p.cmd_req.host_no = shost->host_no;
ev.p.cmd_req.itn_id = itn_id;
ev.p.cmd_req.data_len = scsi_bufflen(cmd);
memcpy(ev.p.cmd_req.scb, cmd->cmnd, sizeof(ev.p.cmd_req.scb));
memcpy(ev.p.cmd_req.lun, lun, sizeof(ev.p.cmd_req.lun));
ev.p.cmd_req.attribute = cmd->tag;
ev.p.cmd_req.tag = tag;
dprintk("%p %d %u %x %llx\n", cmd, shost->host_no,
ev.p.cmd_req.data_len, cmd->tag,
(unsigned long long) ev.p.cmd_req.tag);
err = tgt_uspace_send_event(TGT_KEVENT_CMD_REQ, &ev);
if (err)
eprintk("tx buf is full, could not send\n");
return err;
}
int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 itn_id, u64 tag)
{
struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd);
struct tgt_event ev;
int err;
memset(&ev, 0, sizeof(ev));
ev.p.cmd_done.host_no = shost->host_no;
ev.p.cmd_done.itn_id = itn_id;
ev.p.cmd_done.tag = tag;
ev.p.cmd_done.result = cmd->result;
dprintk("%p %d %llu %u %x\n", cmd, shost->host_no,
(unsigned long long) ev.p.cmd_req.tag,
ev.p.cmd_req.data_len, cmd->tag);
err = tgt_uspace_send_event(TGT_KEVENT_CMD_DONE, &ev);
if (err)
eprintk("tx buf is full, could not send\n");
return err;
}
int scsi_tgt_uspace_send_tsk_mgmt(int host_no, u64 itn_id, int function,
u64 tag, struct scsi_lun *scsilun, void *data)
{
struct tgt_event ev;
int err;
memset(&ev, 0, sizeof(ev));
ev.p.tsk_mgmt_req.host_no = host_no;
ev.p.tsk_mgmt_req.itn_id = itn_id;
ev.p.tsk_mgmt_req.function = function;
ev.p.tsk_mgmt_req.tag = tag;
memcpy(ev.p.tsk_mgmt_req.lun, scsilun, sizeof(ev.p.tsk_mgmt_req.lun));
ev.p.tsk_mgmt_req.mid = (u64) (unsigned long) data;
dprintk("%d %x %llx %llx\n", host_no, function, (unsigned long long) tag,
(unsigned long long) ev.p.tsk_mgmt_req.mid);
err = tgt_uspace_send_event(TGT_KEVENT_TSK_MGMT_REQ, &ev);
if (err)
eprintk("tx buf is full, could not send\n");
return err;
}
int scsi_tgt_uspace_send_it_nexus_request(int host_no, u64 itn_id,
int function, char *initiator_id)
{
struct tgt_event ev;
int err;
memset(&ev, 0, sizeof(ev));
ev.p.it_nexus_req.host_no = host_no;
ev.p.it_nexus_req.function = function;
ev.p.it_nexus_req.itn_id = itn_id;
if (initiator_id)
strncpy(ev.p.it_nexus_req.initiator_id, initiator_id,
sizeof(ev.p.it_nexus_req.initiator_id));
dprintk("%d %x %llx\n", host_no, function, (unsigned long long)itn_id);
err = tgt_uspace_send_event(TGT_KEVENT_IT_NEXUS_REQ, &ev);
if (err)
eprintk("tx buf is full, could not send\n");
return err;
}
static int event_recv_msg(struct tgt_event *ev)
{
int err = 0;
switch (ev->hdr.type) {
case TGT_UEVENT_CMD_RSP:
err = scsi_tgt_kspace_exec(ev->p.cmd_rsp.host_no,
ev->p.cmd_rsp.itn_id,
ev->p.cmd_rsp.result,
ev->p.cmd_rsp.tag,
ev->p.cmd_rsp.uaddr,
ev->p.cmd_rsp.len,
ev->p.cmd_rsp.sense_uaddr,
ev->p.cmd_rsp.sense_len,
ev->p.cmd_rsp.rw);
break;
case TGT_UEVENT_TSK_MGMT_RSP:
err = scsi_tgt_kspace_tsk_mgmt(ev->p.tsk_mgmt_rsp.host_no,
ev->p.tsk_mgmt_rsp.itn_id,
ev->p.tsk_mgmt_rsp.mid,
ev->p.tsk_mgmt_rsp.result);
break;
case TGT_UEVENT_IT_NEXUS_RSP:
err = scsi_tgt_kspace_it_nexus_rsp(ev->p.it_nexus_rsp.host_no,
ev->p.it_nexus_rsp.itn_id,
ev->p.it_nexus_rsp.result);
break;
default:
eprintk("unknown type %d\n", ev->hdr.type);
err = -EINVAL;
}
return err;
}
static ssize_t tgt_write(struct file *file, const char __user * buffer,
size_t count, loff_t * ppos)
{
struct tgt_event *ev;
struct tgt_ring *ring = &rx_ring;
while (1) {
ev = tgt_head_event(ring, ring->tr_idx);
/* do we need this? */
flush_dcache_page(virt_to_page(ev));
if (!ev->hdr.status)
break;
tgt_ring_idx_inc(ring);
event_recv_msg(ev);
ev->hdr.status = 0;
};
return count;
}
static unsigned int tgt_poll(struct file * file, struct poll_table_struct *wait)
{
struct tgt_event *ev;
struct tgt_ring *ring = &tx_ring;
unsigned long flags;
unsigned int mask = 0;
u32 idx;
poll_wait(file, &tgt_poll_wait, wait);
spin_lock_irqsave(&ring->tr_lock, flags);
idx = ring->tr_idx ? ring->tr_idx - 1 : TGT_MAX_EVENTS - 1;
ev = tgt_head_event(ring, idx);
if (ev->hdr.status)
mask |= POLLIN | POLLRDNORM;
spin_unlock_irqrestore(&ring->tr_lock, flags);
return mask;
}
static int uspace_ring_map(struct vm_area_struct *vma, unsigned long addr,
struct tgt_ring *ring)
{
int i, err;
for (i = 0; i < TGT_RING_PAGES; i++) {
struct page *page = virt_to_page(ring->tr_pages[i]);
err = vm_insert_page(vma, addr, page);
if (err)
return err;
addr += PAGE_SIZE;
}
return 0;
}
static int tgt_mmap(struct file *filp, struct vm_area_struct *vma)
{
unsigned long addr;
int err;
if (vma->vm_pgoff)
return -EINVAL;
if (vma->vm_end - vma->vm_start != TGT_RING_SIZE * 2) {
eprintk("mmap size must be %lu, not %lu \n",
TGT_RING_SIZE * 2, vma->vm_end - vma->vm_start);
return -EINVAL;
}
addr = vma->vm_start;
err = uspace_ring_map(vma, addr, &tx_ring);
if (err)
return err;
err = uspace_ring_map(vma, addr + TGT_RING_SIZE, &rx_ring);
return err;
}
static int tgt_open(struct inode *inode, struct file *file)
{
tx_ring.tr_idx = rx_ring.tr_idx = 0;
return 0;
}
static const struct file_operations tgt_fops = {
.owner = THIS_MODULE,
.open = tgt_open,
.poll = tgt_poll,
.write = tgt_write,
.mmap = tgt_mmap,
.llseek = noop_llseek,
};
static struct miscdevice tgt_miscdev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "tgt",
.fops = &tgt_fops,
};
static void tgt_ring_exit(struct tgt_ring *ring)
{
int i;
for (i = 0; i < TGT_RING_PAGES; i++)
free_page(ring->tr_pages[i]);
}
static int tgt_ring_init(struct tgt_ring *ring)
{
int i;
spin_lock_init(&ring->tr_lock);
for (i = 0; i < TGT_RING_PAGES; i++) {
ring->tr_pages[i] = get_zeroed_page(GFP_KERNEL);
if (!ring->tr_pages[i]) {
eprintk("out of memory\n");
return -ENOMEM;
}
}
return 0;
}
void scsi_tgt_if_exit(void)
{
tgt_ring_exit(&tx_ring);
tgt_ring_exit(&rx_ring);
misc_deregister(&tgt_miscdev);
}
int scsi_tgt_if_init(void)
{
int err;
err = tgt_ring_init(&tx_ring);
if (err)
return err;
err = tgt_ring_init(&rx_ring);
if (err)
goto free_tx_ring;
err = misc_register(&tgt_miscdev);
if (err)
goto free_rx_ring;
return 0;
free_rx_ring:
tgt_ring_exit(&rx_ring);
free_tx_ring:
tgt_ring_exit(&tx_ring);
return err;
}

661
drivers/scsi/scsi_tgt_lib.c
Просмотреть файл

@ -1,661 +0,0 @@
/*
* SCSI target lib functions
*
* Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu>
* Copyright (C) 2005 FUJITA Tomonori <tomof@acm.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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <linux/blkdev.h>
#include <linux/hash.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_tgt.h>
#include "scsi_tgt_priv.h"
static struct workqueue_struct *scsi_tgtd;
static struct kmem_cache *scsi_tgt_cmd_cache;
/*
* TODO: this struct will be killed when the block layer supports large bios
* and James's work struct code is in
*/
struct scsi_tgt_cmd {
/* TODO replace work with James b's code */
struct work_struct work;
/* TODO fix limits of some drivers */
struct bio *bio;
struct list_head hash_list;
struct request *rq;
u64 itn_id;
u64 tag;
};
#define TGT_HASH_ORDER 4
#define cmd_hashfn(tag) hash_long((unsigned long) (tag), TGT_HASH_ORDER)
struct scsi_tgt_queuedata {
struct Scsi_Host *shost;
struct list_head cmd_hash[1 << TGT_HASH_ORDER];
spinlock_t cmd_hash_lock;
};
/*
* Function: scsi_host_get_command()
*
* Purpose: Allocate and setup a scsi command block and blk request
*
* Arguments: shost - scsi host
* data_dir - dma data dir
* gfp_mask- allocator flags
*
* Returns: The allocated scsi command structure.
*
* This should be called by target LLDs to get a command.
*/
struct scsi_cmnd *scsi_host_get_command(struct Scsi_Host *shost,
enum dma_data_direction data_dir,
gfp_t gfp_mask)
{
int write = (data_dir == DMA_TO_DEVICE);
struct request *rq;
struct scsi_cmnd *cmd;
struct scsi_tgt_cmd *tcmd;
/* Bail if we can't get a reference to the device */
if (!get_device(&shost->shost_gendev))
return NULL;
tcmd = kmem_cache_alloc(scsi_tgt_cmd_cache, GFP_ATOMIC);
if (!tcmd)
goto put_dev;
/*
* The blk helpers are used to the READ/WRITE requests
* transferring data from a initiator point of view. Since
* we are in target mode we want the opposite.
*/
rq = blk_get_request(shost->uspace_req_q, !write, gfp_mask);
if (!rq)
goto free_tcmd;
cmd = __scsi_get_command(shost, gfp_mask);
if (!cmd)
goto release_rq;
cmd->sc_data_direction = data_dir;
cmd->jiffies_at_alloc = jiffies;
cmd->request = rq;
cmd->cmnd = rq->cmd;
rq->special = cmd;
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->cmd_flags |= REQ_TYPE_BLOCK_PC;
rq->end_io_data = tcmd;
tcmd->rq = rq;
return cmd;
release_rq:
blk_put_request(rq);
free_tcmd:
kmem_cache_free(scsi_tgt_cmd_cache, tcmd);
put_dev:
put_device(&shost->shost_gendev);
return NULL;
}
EXPORT_SYMBOL_GPL(scsi_host_get_command);
/*
* Function: scsi_host_put_command()
*
* Purpose: Free a scsi command block
*
* Arguments: shost - scsi host
* cmd - command block to free
*
* Returns: Nothing.
*
* Notes: The command must not belong to any lists.
*/
void scsi_host_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
{
struct request_queue *q = shost->uspace_req_q;
struct request *rq = cmd->request;
struct scsi_tgt_cmd *tcmd = rq->end_io_data;
unsigned long flags;
kmem_cache_free(scsi_tgt_cmd_cache, tcmd);
spin_lock_irqsave(q->queue_lock, flags);
__blk_put_request(q, rq);
spin_unlock_irqrestore(q->queue_lock, flags);
__scsi_put_command(shost, cmd);
put_device(&shost->shost_gendev);
}
EXPORT_SYMBOL_GPL(scsi_host_put_command);
static void cmd_hashlist_del(struct scsi_cmnd *cmd)
{
struct request_queue *q = cmd->request->q;
struct scsi_tgt_queuedata *qdata = q->queuedata;
unsigned long flags;
struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data;
spin_lock_irqsave(&qdata->cmd_hash_lock, flags);
list_del(&tcmd->hash_list);
spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags);
}
static void scsi_unmap_user_pages(struct scsi_tgt_cmd *tcmd)
{
blk_rq_unmap_user(tcmd->bio);
}
static void scsi_tgt_cmd_destroy(struct work_struct *work)
{
struct scsi_tgt_cmd *tcmd =
container_of(work, struct scsi_tgt_cmd, work);
struct scsi_cmnd *cmd = tcmd->rq->special;
dprintk("cmd %p %d %u\n", cmd, cmd->sc_data_direction,
rq_data_dir(cmd->request));
scsi_unmap_user_pages(tcmd);
tcmd->rq->bio = NULL;
scsi_host_put_command(scsi_tgt_cmd_to_host(cmd), cmd);
}
static void init_scsi_tgt_cmd(struct request *rq, struct scsi_tgt_cmd *tcmd,
u64 itn_id, u64 tag)
{
struct scsi_tgt_queuedata *qdata = rq->q->queuedata;
unsigned long flags;
struct list_head *head;
tcmd->itn_id = itn_id;
tcmd->tag = tag;
tcmd->bio = NULL;
INIT_WORK(&tcmd->work, scsi_tgt_cmd_destroy);
spin_lock_irqsave(&qdata->cmd_hash_lock, flags);
head = &qdata->cmd_hash[cmd_hashfn(tag)];
list_add(&tcmd->hash_list, head);
spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags);
}
/*
* scsi_tgt_alloc_queue - setup queue used for message passing
* shost: scsi host
*
* This should be called by the LLD after host allocation.
* And will be released when the host is released.
*/
int scsi_tgt_alloc_queue(struct Scsi_Host *shost)
{
struct scsi_tgt_queuedata *queuedata;
struct request_queue *q;
int err, i;
/*
* Do we need to send a netlink event or should uspace
* just respond to the hotplug event?
*/
q = __scsi_alloc_queue(shost, NULL);
if (!q)
return -ENOMEM;
queuedata = kzalloc(sizeof(*queuedata), GFP_KERNEL);
if (!queuedata) {
err = -ENOMEM;
goto cleanup_queue;
}
queuedata->shost = shost;
q->queuedata = queuedata;
/*
* this is a silly hack. We should probably just queue as many
* command as is recvd to userspace. uspace can then make
* sure we do not overload the HBA
*/
q->nr_requests = shost->can_queue;
/*
* We currently only support software LLDs so this does
* not matter for now. Do we need this for the cards we support?
* If so we should make it a host template value.
*/
blk_queue_dma_alignment(q, 0);
shost->uspace_req_q = q;
for (i = 0; i < ARRAY_SIZE(queuedata->cmd_hash); i++)
INIT_LIST_HEAD(&queuedata->cmd_hash[i]);
spin_lock_init(&queuedata->cmd_hash_lock);
return 0;
cleanup_queue:
blk_cleanup_queue(q);
return err;
}
EXPORT_SYMBOL_GPL(scsi_tgt_alloc_queue);
void scsi_tgt_free_queue(struct Scsi_Host *shost)
{
int i;
unsigned long flags;
struct request_queue *q = shost->uspace_req_q;
struct scsi_cmnd *cmd;
struct scsi_tgt_queuedata *qdata = q->queuedata;
struct scsi_tgt_cmd *tcmd, *n;
LIST_HEAD(cmds);
spin_lock_irqsave(&qdata->cmd_hash_lock, flags);
for (i = 0; i < ARRAY_SIZE(qdata->cmd_hash); i++) {
list_for_each_entry_safe(tcmd, n, &qdata->cmd_hash[i],
hash_list)
list_move(&tcmd->hash_list, &cmds);
}
spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags);
while (!list_empty(&cmds)) {
tcmd = list_entry(cmds.next, struct scsi_tgt_cmd, hash_list);
list_del(&tcmd->hash_list);
cmd = tcmd->rq->special;
shost->hostt->eh_abort_handler(cmd);
scsi_tgt_cmd_destroy(&tcmd->work);
}
}
EXPORT_SYMBOL_GPL(scsi_tgt_free_queue);
struct Scsi_Host *scsi_tgt_cmd_to_host(struct scsi_cmnd *cmd)
{
struct scsi_tgt_queuedata *queue = cmd->request->q->queuedata;
return queue->shost;
}
EXPORT_SYMBOL_GPL(scsi_tgt_cmd_to_host);
/*
* scsi_tgt_queue_command - queue command for userspace processing
* @cmd: scsi command
* @scsilun: scsi lun
* @tag: unique value to identify this command for tmf
*/
int scsi_tgt_queue_command(struct scsi_cmnd *cmd, u64 itn_id,
struct scsi_lun *scsilun, u64 tag)
{
struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data;
int err;
init_scsi_tgt_cmd(cmd->request, tcmd, itn_id, tag);
err = scsi_tgt_uspace_send_cmd(cmd, itn_id, scsilun, tag);
if (err)
cmd_hashlist_del(cmd);
return err;
}
EXPORT_SYMBOL_GPL(scsi_tgt_queue_command);
/*
* This is run from a interrupt handler normally and the unmap
* needs process context so we must queue
*/
static void scsi_tgt_cmd_done(struct scsi_cmnd *cmd)
{
struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data;
dprintk("cmd %p %u\n", cmd, rq_data_dir(cmd->request));
scsi_tgt_uspace_send_status(cmd, tcmd->itn_id, tcmd->tag);
scsi_release_buffers(cmd);
queue_work(scsi_tgtd, &tcmd->work);
}
static int scsi_tgt_transfer_response(struct scsi_cmnd *cmd)
{
struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd);
int err;
dprintk("cmd %p %u\n", cmd, rq_data_dir(cmd->request));
err = shost->hostt->transfer_response(cmd, scsi_tgt_cmd_done);
switch (err) {
case SCSI_MLQUEUE_HOST_BUSY:
case SCSI_MLQUEUE_DEVICE_BUSY:
return -EAGAIN;
}
return 0;
}
/* TODO: test this crap and replace bio_map_user with new interface maybe */
static int scsi_map_user_pages(struct scsi_tgt_cmd *tcmd, struct scsi_cmnd *cmd,
unsigned long uaddr, unsigned int len, int rw)
{
struct request_queue *q = cmd->request->q;
struct request *rq = cmd->request;
int err;
dprintk("%lx %u\n", uaddr, len);
err = blk_rq_map_user(q, rq, NULL, (void *)uaddr, len, GFP_KERNEL);
if (err) {
/*
* TODO: need to fixup sg_tablesize, max_segment_size,
* max_sectors, etc for modern HW and software drivers
* where this value is bogus.
*
* TODO2: we can alloc a reserve buffer of max size
* we can handle and do the slow copy path for really large
* IO.
*/
eprintk("Could not handle request of size %u.\n", len);
return err;
}
tcmd->bio = rq->bio;
err = scsi_init_io(cmd, GFP_KERNEL);
if (err) {
scsi_release_buffers(cmd);
goto unmap_rq;
}
/*
* we use REQ_TYPE_BLOCK_PC so scsi_init_io doesn't set the
* length for us.
*/
cmd->sdb.length = blk_rq_bytes(rq);
return 0;
unmap_rq:
scsi_unmap_user_pages(tcmd);
return err;
}
static int scsi_tgt_copy_sense(struct scsi_cmnd *cmd, unsigned long uaddr,
unsigned len)
{
char __user *p = (char __user *) uaddr;
if (copy_from_user(cmd->sense_buffer, p,
min_t(unsigned, SCSI_SENSE_BUFFERSIZE, len))) {
printk(KERN_ERR "Could not copy the sense buffer\n");
return -EIO;
}
return 0;
}
static int scsi_tgt_abort_cmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
{
struct scsi_tgt_cmd *tcmd;
int err;
err = shost->hostt->eh_abort_handler(cmd);
if (err)
eprintk("fail to abort %p\n", cmd);
tcmd = cmd->request->end_io_data;
scsi_tgt_cmd_destroy(&tcmd->work);
return err;
}
static struct request *tgt_cmd_hash_lookup(struct request_queue *q, u64 tag)
{
struct scsi_tgt_queuedata *qdata = q->queuedata;
struct request *rq = NULL;
struct list_head *head;
struct scsi_tgt_cmd *tcmd;
unsigned long flags;
head = &qdata->cmd_hash[cmd_hashfn(tag)];
spin_lock_irqsave(&qdata->cmd_hash_lock, flags);
list_for_each_entry(tcmd, head, hash_list) {
if (tcmd->tag == tag) {
rq = tcmd->rq;
list_del(&tcmd->hash_list);
break;
}
}
spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags);
return rq;
}
int scsi_tgt_kspace_exec(int host_no, u64 itn_id, int result, u64 tag,
unsigned long uaddr, u32 len, unsigned long sense_uaddr,
u32 sense_len, u8 rw)
{
struct Scsi_Host *shost;
struct scsi_cmnd *cmd;
struct request *rq;
struct scsi_tgt_cmd *tcmd;
int err = 0;
dprintk("%d %llu %d %u %lx %u\n", host_no, (unsigned long long) tag,
result, len, uaddr, rw);
/* TODO: replace with a O(1) alg */
shost = scsi_host_lookup(host_no);
if (!shost) {
printk(KERN_ERR "Could not find host no %d\n", host_no);
return -EINVAL;
}
if (!shost->uspace_req_q) {
printk(KERN_ERR "Not target scsi host %d\n", host_no);
goto done;
}
rq = tgt_cmd_hash_lookup(shost->uspace_req_q, tag);
if (!rq) {
printk(KERN_ERR "Could not find tag %llu\n",
(unsigned long long) tag);
err = -EINVAL;
goto done;
}
cmd = rq->special;
dprintk("cmd %p scb %x result %d len %d bufflen %u %u %x\n",
cmd, cmd->cmnd[0], result, len, scsi_bufflen(cmd),
rq_data_dir(rq), cmd->cmnd[0]);
if (result == TASK_ABORTED) {
scsi_tgt_abort_cmd(shost, cmd);
goto done;
}
/*
* store the userspace values here, the working values are
* in the request_* values
*/
tcmd = cmd->request->end_io_data;
cmd->result = result;
if (cmd->result == SAM_STAT_CHECK_CONDITION)
scsi_tgt_copy_sense(cmd, sense_uaddr, sense_len);
if (len) {
err = scsi_map_user_pages(rq->end_io_data, cmd, uaddr, len, rw);
if (err) {
/*
* user-space daemon bugs or OOM
* TODO: we can do better for OOM.
*/
struct scsi_tgt_queuedata *qdata;
struct list_head *head;
unsigned long flags;
eprintk("cmd %p ret %d uaddr %lx len %d rw %d\n",
cmd, err, uaddr, len, rw);
qdata = shost->uspace_req_q->queuedata;
head = &qdata->cmd_hash[cmd_hashfn(tcmd->tag)];
spin_lock_irqsave(&qdata->cmd_hash_lock, flags);
list_add(&tcmd->hash_list, head);
spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags);
goto done;
}
}
err = scsi_tgt_transfer_response(cmd);
done:
scsi_host_put(shost);
return err;
}
int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *shost, u64 itn_id,
int function, u64 tag, struct scsi_lun *scsilun,
void *data)
{
int err;
/* TODO: need to retry if this fails. */
err = scsi_tgt_uspace_send_tsk_mgmt(shost->host_no, itn_id,
function, tag, scsilun, data);
if (err < 0)
eprintk("The task management request lost!\n");
return err;
}
EXPORT_SYMBOL_GPL(scsi_tgt_tsk_mgmt_request);
int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 itn_id, u64 mid, int result)
{
struct Scsi_Host *shost;
int err = -EINVAL;
dprintk("%d %d %llx\n", host_no, result, (unsigned long long) mid);
shost = scsi_host_lookup(host_no);
if (!shost) {
printk(KERN_ERR "Could not find host no %d\n", host_no);
return err;
}
if (!shost->uspace_req_q) {
printk(KERN_ERR "Not target scsi host %d\n", host_no);
goto done;
}
err = shost->transportt->tsk_mgmt_response(shost, itn_id, mid, result);
done:
scsi_host_put(shost);
return err;
}
int scsi_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
char *initiator)
{
int err;
/* TODO: need to retry if this fails. */
err = scsi_tgt_uspace_send_it_nexus_request(shost->host_no, itn_id, 0,
initiator);
if (err < 0)
eprintk("The i_t_neuxs request lost, %d %llx!\n",
shost->host_no, (unsigned long long)itn_id);
return err;
}
EXPORT_SYMBOL_GPL(scsi_tgt_it_nexus_create);
int scsi_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
{
int err;
/* TODO: need to retry if this fails. */
err = scsi_tgt_uspace_send_it_nexus_request(shost->host_no,
itn_id, 1, NULL);
if (err < 0)
eprintk("The i_t_neuxs request lost, %d %llx!\n",
shost->host_no, (unsigned long long)itn_id);
return err;
}
EXPORT_SYMBOL_GPL(scsi_tgt_it_nexus_destroy);
int scsi_tgt_kspace_it_nexus_rsp(int host_no, u64 itn_id, int result)
{
struct Scsi_Host *shost;
int err = -EINVAL;
dprintk("%d %d%llx\n", host_no, result, (unsigned long long)itn_id);
shost = scsi_host_lookup(host_no);
if (!shost) {
printk(KERN_ERR "Could not find host no %d\n", host_no);
return err;
}
if (!shost->uspace_req_q) {
printk(KERN_ERR "Not target scsi host %d\n", host_no);
goto done;
}
err = shost->transportt->it_nexus_response(shost, itn_id, result);
done:
scsi_host_put(shost);
return err;
}
static int __init scsi_tgt_init(void)
{
int err;
scsi_tgt_cmd_cache = KMEM_CACHE(scsi_tgt_cmd, 0);
if (!scsi_tgt_cmd_cache)
return -ENOMEM;
scsi_tgtd = alloc_workqueue("scsi_tgtd", 0, 1);
if (!scsi_tgtd) {
err = -ENOMEM;
goto free_kmemcache;
}
err = scsi_tgt_if_init();
if (err)
goto destroy_wq;
return 0;
destroy_wq:
destroy_workqueue(scsi_tgtd);
free_kmemcache:
kmem_cache_destroy(scsi_tgt_cmd_cache);
return err;
}
static void __exit scsi_tgt_exit(void)
{
destroy_workqueue(scsi_tgtd);
scsi_tgt_if_exit();
kmem_cache_destroy(scsi_tgt_cmd_cache);
}
module_init(scsi_tgt_init);
module_exit(scsi_tgt_exit);
MODULE_DESCRIPTION("SCSI target core");
MODULE_LICENSE("GPL");

32
drivers/scsi/scsi_tgt_priv.h
Просмотреть файл

@ -1,32 +0,0 @@
struct scsi_cmnd;
struct scsi_lun;
struct Scsi_Host;
struct task_struct;
/* tmp - will replace with SCSI logging stuff */
#define eprintk(fmt, args...) \
do { \
printk("%s(%d) " fmt, __func__, __LINE__, ##args); \
} while (0)
#define dprintk(fmt, args...)
/* #define dprintk eprintk */
extern void scsi_tgt_if_exit(void);
extern int scsi_tgt_if_init(void);
extern int scsi_tgt_uspace_send_cmd(struct scsi_cmnd *cmd, u64 it_nexus_id,
struct scsi_lun *lun, u64 tag);
extern int scsi_tgt_uspace_send_status(struct scsi_cmnd *cmd, u64 it_nexus_id,
u64 tag);
extern int scsi_tgt_kspace_exec(int host_no, u64 it_nexus_id, int result, u64 tag,
unsigned long uaddr, u32 len,
unsigned long sense_uaddr, u32 sense_len, u8 rw);
extern int scsi_tgt_uspace_send_tsk_mgmt(int host_no, u64 it_nexus_id,
int function, u64 tag,
struct scsi_lun *scsilun, void *data);
extern int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 it_nexus_id,
u64 mid, int result);
extern int scsi_tgt_uspace_send_it_nexus_request(int host_no, u64 it_nexus_id,
int function, char *initiator);
extern int scsi_tgt_kspace_it_nexus_rsp(int host_no, u64 it_nexus_id, int result);

12
drivers/scsi/scsi_transport_fc.c
Просмотреть файл

@ -39,7 +39,6 @@
#include <scsi/scsi_netlink_fc.h>
#include <scsi/scsi_bsg_fc.h>
#include "scsi_priv.h"
#include "scsi_transport_fc_internal.h"
static int fc_queue_work(struct Scsi_Host *, struct work_struct *);
static void fc_vport_sched_delete(struct work_struct *work);
@ -3008,10 +3007,6 @@ fc_remote_port_delete(struct fc_rport *rport)
spin_unlock_irqrestore(shost->host_lock, flags);
if (rport->roles & FC_PORT_ROLE_FCP_INITIATOR &&
shost->active_mode & MODE_TARGET)
fc_tgt_it_nexus_destroy(shost, (unsigned long)rport);
scsi_target_block(&rport->dev);
/* see if we need to kill io faster than waiting for device loss */
@ -3052,7 +3047,6 @@ fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
unsigned long flags;
int create = 0;
int ret;
spin_lock_irqsave(shost->host_lock, flags);
if (roles & FC_PORT_ROLE_FCP_TARGET) {
@ -3061,12 +3055,6 @@ fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
create = 1;
} else if (!(rport->roles & FC_PORT_ROLE_FCP_TARGET))
create = 1;
} else if (shost->active_mode & MODE_TARGET) {
ret = fc_tgt_it_nexus_create(shost, (unsigned long)rport,
(char *)&rport->node_name);
if (ret)
printk(KERN_ERR "FC Remore Port tgt nexus failed %d\n",
ret);
}
rport->roles = roles;

26
drivers/scsi/scsi_transport_fc_internal.h
Просмотреть файл

@ -1,26 +0,0 @@
#include <scsi/scsi_tgt.h>
#ifdef CONFIG_SCSI_FC_TGT_ATTRS
static inline int fc_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
char *initiator)
{
return scsi_tgt_it_nexus_create(shost, itn_id, initiator);
}
static inline int fc_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
{
return scsi_tgt_it_nexus_destroy(shost, itn_id);
}
#else
static inline int fc_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
char *initiator)
{
return 0;
}
static inline int fc_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
{
return 0;
}
#endif

18
drivers/scsi/scsi_transport_srp.c
Просмотреть файл

@ -33,7 +33,6 @@
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_srp.h>
#include "scsi_priv.h"
#include "scsi_transport_srp_internal.h"
struct srp_host_attrs {
atomic_t next_port_id;
@ -746,18 +745,6 @@ struct srp_rport *srp_rport_add(struct Scsi_Host *shost,
return ERR_PTR(ret);
}
if (shost->active_mode & MODE_TARGET &&
ids->roles == SRP_RPORT_ROLE_INITIATOR) {
ret = srp_tgt_it_nexus_create(shost, (unsigned long)rport,
rport->port_id);
if (ret) {
device_del(&rport->dev);
transport_destroy_device(&rport->dev);
put_device(&rport->dev);
return ERR_PTR(ret);
}
}
transport_add_device(&rport->dev);
transport_configure_device(&rport->dev);
@ -774,11 +761,6 @@ EXPORT_SYMBOL_GPL(srp_rport_add);
void srp_rport_del(struct srp_rport *rport)
{
struct device *dev = &rport->dev;
struct Scsi_Host *shost = dev_to_shost(dev->parent);
if (shost->active_mode & MODE_TARGET &&
rport->roles == SRP_RPORT_ROLE_INITIATOR)
srp_tgt_it_nexus_destroy(shost, (unsigned long)rport);
transport_remove_device(dev);
device_del(dev);

25
drivers/scsi/scsi_transport_srp_internal.h
Просмотреть файл

@ -1,25 +0,0 @@
#include <scsi/scsi_tgt.h>
#ifdef CONFIG_SCSI_SRP_TGT_ATTRS
static inline int srp_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
char *initiator)
{
return scsi_tgt_it_nexus_create(shost, itn_id, initiator);
}
static inline int srp_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
{
return scsi_tgt_it_nexus_destroy(shost, itn_id);
}
#else
static inline int srp_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id,
char *initiator)
{
return 0;
}
static inline int srp_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id)
{
return 0;
}
#endif

21
include/scsi/scsi_host.h
Просмотреть файл

@ -131,27 +131,6 @@ struct scsi_host_template {
*/
int (* queuecommand)(struct Scsi_Host *, struct scsi_cmnd *);
/*
* The transfer functions are used to queue a scsi command to
* the LLD. When the driver is finished processing the command
* the done callback is invoked.
*
* This is called to inform the LLD to transfer
* scsi_bufflen(cmd) bytes. scsi_sg_count(cmd) speciefies the
* number of scatterlist entried in the command and
* scsi_sglist(cmd) returns the scatterlist.
*
* return values: see queuecommand
*
* If the LLD accepts the cmd, it should set the result to an
* appropriate value when completed before calling the done function.
*
* STATUS: REQUIRED FOR TARGET DRIVERS
*/
/* TODO: rename */
int (* transfer_response)(struct scsi_cmnd *,
void (*done)(struct scsi_cmnd *));
/*
* This is an error handling strategy routine. You don't need to
* define one of these if you don't want to - there is a default

21
include/scsi/scsi_tgt.h
Просмотреть файл

@ -1,21 +0,0 @@
/*
* SCSI target definitions
*/
#include <linux/dma-mapping.h>
struct Scsi_Host;
struct scsi_cmnd;
struct scsi_lun;
extern struct Scsi_Host *scsi_tgt_cmd_to_host(struct scsi_cmnd *);
extern int scsi_tgt_alloc_queue(struct Scsi_Host *);
extern void scsi_tgt_free_queue(struct Scsi_Host *);
extern int scsi_tgt_queue_command(struct scsi_cmnd *, u64, struct scsi_lun *, u64);
extern int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *, u64, int, u64,
struct scsi_lun *, void *);
extern struct scsi_cmnd *scsi_host_get_command(struct Scsi_Host *,
enum dma_data_direction, gfp_t);
extern void scsi_host_put_command(struct Scsi_Host *, struct scsi_cmnd *);
extern int scsi_tgt_it_nexus_create(struct Scsi_Host *, u64, char *);
extern int scsi_tgt_it_nexus_destroy(struct Scsi_Host *, u64);

108
include/scsi/scsi_tgt_if.h
Просмотреть файл

@ -1,108 +0,0 @@
/*
* SCSI target kernel/user interface
*
* Copyright (C) 2005 FUJITA Tomonori <tomof@acm.org>
* Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu>
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef __SCSI_TARGET_IF_H
#define __SCSI_TARGET_IF_H
/* user -> kernel */
#define TGT_UEVENT_CMD_RSP 0x0001
#define TGT_UEVENT_IT_NEXUS_RSP 0x0002
#define TGT_UEVENT_TSK_MGMT_RSP 0x0003
/* kernel -> user */
#define TGT_KEVENT_CMD_REQ 0x1001
#define TGT_KEVENT_CMD_DONE 0x1002
#define TGT_KEVENT_IT_NEXUS_REQ 0x1003
#define TGT_KEVENT_TSK_MGMT_REQ 0x1004
struct tgt_event_hdr {
uint16_t version;
uint16_t status;
uint16_t type;
uint16_t len;
} __attribute__ ((aligned (sizeof(uint64_t))));
struct tgt_event {
struct tgt_event_hdr hdr;
union {
/* user-> kernel */
struct {
int host_no;
int result;
aligned_u64 itn_id;
aligned_u64 tag;
aligned_u64 uaddr;
aligned_u64 sense_uaddr;
uint32_t len;
uint32_t sense_len;
uint8_t rw;
} cmd_rsp;
struct {
int host_no;
int result;
aligned_u64 itn_id;
aligned_u64 mid;
} tsk_mgmt_rsp;
struct {
__s32 host_no;
__s32 result;
aligned_u64 itn_id;
__u32 function;
} it_nexus_rsp;
/* kernel -> user */
struct {
int host_no;
uint32_t data_len;
aligned_u64 itn_id;
uint8_t scb[16];
uint8_t lun[8];
int attribute;
aligned_u64 tag;
} cmd_req;
struct {
int host_no;
int result;
aligned_u64 itn_id;
aligned_u64 tag;
} cmd_done;
struct {
int host_no;
int function;
aligned_u64 itn_id;
aligned_u64 tag;
uint8_t lun[8];
aligned_u64 mid;
} tsk_mgmt_req;
struct {
__s32 host_no;
__u32 function;
aligned_u64 itn_id;
__u32 max_cmds;
__u8 initiator_id[16];
} it_nexus_req;
} p;
} __attribute__ ((aligned (sizeof(uint64_t))));
#define TGT_RING_SIZE (1UL << 16)
#endif