- 根目录:
- drivers
- scsi
- ibmvscsi
- ibmvstgt.c
/*
* IBM eServer i/pSeries Virtual SCSI Target Driver
* Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp.
* Santiago Leon (santil@us.ibm.com) IBM Corp.
* Linda Xie (lxie@us.ibm.com) IBM Corp.
*
* Copyright (C) 2005-2006 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport_srp.h>
#include <scsi/scsi_tgt.h>
#include <scsi/libsrp.h>
#include <asm/hvcall.h>
#include <asm/iommu.h>
#include <asm/prom.h>
#include <asm/vio.h>
#include "ibmvscsi.h"
#define INITIAL_SRP_LIMIT 16
#define DEFAULT_MAX_SECTORS 256
#define TGT_NAME "ibmvstgt"
/*
* Hypervisor calls.
*/
#define h_copy_rdma(l, sa, sb, da, db) \
plpar_hcall_norets(H_COPY_RDMA, l, sa, sb, da, db)
#define h_send_crq(ua, l, h) \
plpar_hcall_norets(H_SEND_CRQ, ua, l, h)
#define h_reg_crq(ua, tok, sz)\
plpar_hcall_norets(H_REG_CRQ, ua, tok, sz);
#define h_free_crq(ua) \
plpar_hcall_norets(H_FREE_CRQ, ua);
/* tmp - will replace with SCSI logging stuff */
#define eprintk(fmt, args...) \
do { \
printk("%s(%d) " fmt, __func__, __LINE__, ##args); \
} while (0)
/* #define dprintk eprintk */
#define dprintk(fmt, args...)
struct vio_port {
struct vio_dev *dma_dev;
struct crq_queue crq_queue;
struct work_struct crq_work;
unsigned long liobn;
unsigned long riobn;
struct srp_target *target;
struct srp_rport *rport;
};
static struct workqueue_struct *vtgtd;
static struct scsi_transport_template *ibmvstgt_transport_template;
/*
* These are fixed for the system and come from the Open Firmware device tree.
* We just store them here to save getting them every time.
*/
static char system_id[64] = "";
static char partition_name[97] = "UNKNOWN";
static unsigned int partition_number = -1;
static struct vio_port *target_to_port(struct srp_target *target)
{
return (struct vio_port *) target->ldata;
}
static inline union viosrp_iu *vio_iu(struct iu_entry *iue)
{
return (union viosrp_iu *) (iue->sbuf->buf);
}
static int send_iu(struct iu_entry *iue, uint64_t length, uint8_t format)
{
struct srp_target *target = iue->target;
struct vio_port *vport = target_to_port(target);
long rc, rc1;
union {
struct viosrp_crq cooked;
uint64_t raw[2];
} crq;
/* First copy the SRP */
rc = h_copy_rdma(length, vport->liobn, iue->sbuf->dma,
vport->riobn, iue->remote_token);
if (rc)
eprintk("Error %ld transferring data\n", rc);
crq.cooked.valid = 0x80;
crq.cooked.format = format;
crq.cooked.reserved = 0x00;
crq.cooked.timeout = 0x00;
crq.cooked.IU_length = length;
crq.cooked.IU_data_ptr = vio_iu(iue)->srp.rsp.tag;
if (rc == 0)
crq.cooked.status = 0x99; /* Just needs to be non-zero */
else
crq.cooked.status = 0x00;
rc1 = h_send_crq(vport->dma_dev->unit_address, crq.raw[0], crq.raw[1]);
if (rc1) {
eprintk("%ld sending response\n", rc1);
return rc1;
}
return rc;
}
#define SRP_RSP_SENSE_DATA_LEN 18
static int send_rsp(struct iu_entry *iue, struct scsi_cmnd *sc,
unsigned char status, unsigned char asc)
{
union viosrp_iu *iu = vio_iu(iue);
uint64_t tag = iu->srp.rsp.tag;
/* If the linked bit is on and status is good */
if (test_bit(V_LINKED, &iue->flags) && (status == NO_SENSE))
status = 0x10;
memset(iu, 0, sizeof(struct srp_rsp));
iu->srp.rsp.opcode = SRP_RSP;
iu->srp.rsp.req_lim_delta = 1;
iu->srp.rsp.tag = tag;
if (test_bit(V_DIOVER, &iue->flags))
iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
iu->srp.rsp.data_in_res_cnt = 0;
iu->srp.rsp.data_out_res_cnt = 0;
iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID;
iu->srp.rsp.resp_data_len = 0;
iu->srp.rsp.status = status;
if (status) {
uint8_t *sense = iu->srp.rsp.data;
if (sc) {
iu->srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
iu->srp.rsp.sense_data_len = SCSI_SENSE_BUFFERSIZE;
memcpy(sense, sc->sense_buffer, SCSI_SENSE_BUFFERSIZE);
} else {
iu->srp.rsp.status = SAM_STAT_CHECK_CONDITION;
iu->srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
iu->srp.rsp.sense_data_len = SRP_RSP_SENSE_DATA_LEN;
/* Valid bit and 'current errors' */
sense[0] = (0x1 << 7 | 0x70);
/* Sense key */
sense[2] = status;
/* Additional sense length */
sense[7] = 0xa; /* 10 bytes */
/* Additional sense code */
sense[12] = asc;
}
}
send_iu(iue, sizeof(iu->srp.rsp) + SRP_RSP_SENSE_DATA_LEN,
VIOSRP_SRP_FORMAT);
return 0;
}
static void handle_cmd_queue(struct srp_target *target)
{
struct Scsi_Host *shost = target->shost;
struct srp_rport *rport = target_to_port(target)->rport;
struct iu_entry *iue;
struct srp_cmd *cmd;
unsigned long flags;
int err;
retry:
spin_lock_irqsave(&target->lock, flags);
list_for_each_entry(iue, &target->cmd_queue, ilist) {
if (!test_and_set_bit(V_FLYING, &iue->flags)) {
spin_unlock_irqrestore(&target->lock, flags);
cmd = iue->sbuf->buf;
err = srp_cmd_queue(shost, cmd, iue,
(unsigned long)rport, 0);
if (err) {
eprintk("cannot queue cmd %p %d\n", cmd, err);
srp_iu_put(iue);
}
goto retry;
}
}
spin_unlock_irqrestore(&target->lock, flags);
}
static int ibmvstgt_rdma(struct scsi_cmnd *sc, struct scatterlist *sg, int nsg,
struct srp_direct_buf *md, int nmd,
enum dma_data_direction dir, unsigned int rest)
{
struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr;
struct srp_target *target = iue->target;
struct vio_port *vport = target_to_port(target);
dma_addr_t token;
long err;
unsigned int done = 0;
int i, sidx, soff;
sidx = soff = 0;
token = sg_dma_address(sg + sidx);
for (i = 0; i < nmd && rest; i++) {
unsigned int mdone, mlen;
mlen = min(rest, md[i].len);
for (mdone = 0; mlen;) {
int slen = min(sg_dma_len(sg + sidx) - soff, mlen);
if (dir == DMA_TO_DEVICE)
err = h_copy_rdma(slen,
vport->riobn,
md[i].va + mdone,
vport->liobn,
token + soff);
else
err = h_copy_rdma(slen,
vport->liobn,
token + soff,
vport->riobn,
md[i].va + mdone);
if (err != H_SUCCESS) {
eprintk("rdma error %d %d %ld\n", dir, slen, err);
return -EIO;
}
mlen -= slen;
mdone += slen;
soff += slen;
done += slen;
if (soff == sg_dma_len(sg + sidx)) {
sidx++;
soff = 0;
token = sg_dma_address(sg + sidx);
if (sidx > nsg) {
eprintk("out of sg %p %d %d\n",
iue, sidx, nsg);
return -EIO;
}
}
};
rest -= mlen;
}
return 0;
}
static int ibmvstgt_cmd_done(struct scsi_cmnd *sc,
void (*done)(struct scsi_cmnd *))
{
unsigned long flags;
struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr;
struct srp_target *target = iue->target;
int err = 0;
dprintk("%p %p %x %u\n", iue, target, vio_iu(iue)->srp.cmd.cdb[0],
scsi_sg_count(sc));
if (scsi_sg_count(sc))
err = srp_transfer_data(sc, &vio_iu(iue)->srp.cmd, ibmvstgt_rdma, 1, 1);
spin_lock_irqsave(&target->lock, flags);
list_del(&iue->ilist);
spin_unlock_irqrestore(&target->lock, flags);
if (err|| sc->result != SAM_STAT_GOOD) {
eprintk("operation failed %p %d %x\n",
iue, sc->result, vio_iu(iue)->srp.cmd.cdb[0]);
send_rsp(iue, sc, HARDWARE_ERROR, 0x00);
} else
send_rsp(iue, sc, NO_SENSE, 0x00);
done(sc);
srp_iu_put(iue);
return 0;
}
int send_adapter_info(struct iu_entry *iue,
dma_addr_t remote_buffer, uint16_t length)
{
struct srp_target *target = iue->target;
struct vio_port *vport = target_to_port(target);
struct Scsi_Host *shost = target->shost;
dma_addr_t data_token;
struct mad_adapter_info_data *info;
int err;
info = dma_alloc_coherent(target->dev, sizeof(*info), &data_token,
GFP_KERNEL);
if (!info) {
eprintk("bad dma_alloc_coherent %p\n", target);
return 1;
}
/* Get remote info */
err = h_copy_rdma(sizeof(*info), vport->riobn, remote_buffer,
vport->liobn, data_token);
if (err == H_SUCCESS) {
dprintk("Client connect: %s (%d)\n",
info->partition_name, info->partition_number);
}
memset(info, 0, sizeof(*info));
strcpy(info->srp_version, "16.a");
strncpy(info->partition_name, partition_name,
sizeof(info->partition_name));
info->partition_number = partition_number;
info->mad_version = 1;
info->os_type = 2;
info->port_max_txu[0] = shost->hostt->max_sectors << 9;
/* Send our info to remote */
err = h_copy_rdma(sizeof(*info), vport->liobn, data_token,
vport->riobn, remote_buffer);
dma_free_coherent(target->dev, sizeof(*info), info, data_token);
if (err != H_SUCCESS) {
eprintk("Error sending adapter info %d\n", err);
return 1;
}
return 0;
}
static void process_login(struct iu_entry *iue)
{
union viosrp_iu *iu = vio_iu(iue);
struct srp_login_rsp *rsp = &iu->srp.login_rsp;
uint64_t tag = iu->srp.rsp.tag;
struct Scsi_Host *shost = iue->target->shost;
struct srp_target *target = host_to_srp_target(shost);
struct vio_port *vport = target_to_port(target);
struct srp_rport_identifiers ids;
memset(&ids, 0, sizeof(ids));
sprintf(ids.port_id, "%x", vport->dma_dev->unit_address);
ids.roles = SRP_RPORT_ROLE_INITIATOR;
if (!vport->rport)
vport->rport = srp_rport_add(shost, &ids);
/* TODO handle case that requested size is wrong and
* buffer format is wrong
*/
memset(iu, 0, sizeof(struct srp_login_rsp));
rsp->opcode = SRP_LOGIN_RSP;
rsp->req_lim_delta = INITIAL_SRP_LIMIT;
rsp->tag = tag;
rsp->max_it_iu_len = sizeof(union srp_iu);
rsp->max_ti_iu_len = sizeof(union srp_iu);
/* direct and indirect */
rsp->buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
send_iu(iue, sizeof(*rsp), VIOSRP_SRP_FORMAT);
}
static inline void queue_cmd(struct iu_entry *iue)
{
struct srp_target *target = iue->target;
unsigned long flags;
spin_lock_irqsave(&target->lock, flags);
list_add_tail(&iue->ilist, &target->cmd_queue);
spin_unlock_irqrestore(&target->lock, flags);
}
static int process_tsk_mgmt(struct iu_entry *iue)
{
union viosrp_iu *iu = vio_iu(iue);
int fn;
dprintk("%p %u\n", iue, iu->srp.tsk_mgmt.tsk_mgmt_func);
switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
case SRP_TSK_ABORT_TASK:
fn = ABORT_TASK;
break;
case SRP_TSK_ABORT_TASK_SET:
fn = ABORT_TASK_SET;
break;
case SRP_TSK_CLEAR_TASK_SET:
fn = CLEAR_TASK_SET;
break;
case SRP_TSK_LUN_RESET:
fn = LOGICAL_UNIT_RESET;
break;
case SRP_TSK_CLEAR_ACA:
fn = CLEAR_ACA;
break;
default:
fn = 0;
}
if (fn)
scsi_tgt_tsk_mgmt_request(iue->target->shost,
(unsigned long)iue->target->shost,
fn,
iu->srp.tsk_mgmt.task_tag,
(struct scsi_lun *) &iu->srp.tsk_mgmt.lun,
iue);
else
send_rsp(iue, NULL, ILLEGAL_REQUEST, 0x20);
return !fn;
}
static int process_mad_iu(struct iu_entry *iue)
{
union viosrp_iu *iu = vio_iu(iue);
struct viosrp_adapter_info *info;
struct viosrp_host_config *conf;
switch (iu->mad.empty_iu.common.type) {
case VIOSRP_EMPTY_IU_TYPE:
eprintk("%s\n", "Unsupported EMPTY MAD IU");
break;
case VIOSRP_ERROR_LOG_TYPE:
eprintk("%s\n", "Unsupported ERROR LOG MAD IU");
iu->mad.error_log.common.status = 1;
send_iu(iue, sizeof(iu->mad.error_log), VIOSRP_MAD_FORMAT);
break;
case VIOSRP_ADAPTER_INFO_TYPE:
info = &iu->mad.adapter_info;
info->common.status = send_adapter_info(iue, info->buffer,
info->common.length);
send_iu(iue, sizeof(*info), VIOSRP_MAD_FORMAT);
break;
case VIOSRP_HOST_CONFIG_TYPE:
conf = &iu->mad.host_config;
conf->common.status = 1;
send_iu(iue, sizeof(*conf), VIOSRP_MAD_FORMAT);
break;
default:
eprintk("Unknown type %u\n", iu->srp.rsp.opcode);
}
return 1;
}
static int process_srp_iu(struct iu_entry *iue)
{
union viosrp_iu *iu = vio_iu(iue);
int done = 1;
u8 opcode = iu->srp.rsp.opcode;
switch (opcode) {
case SRP_LOGIN_REQ:
process_login(iue);
break;
case SRP_TSK_MGMT:
done = process_tsk_mgmt(iue);
break;
case SRP_CMD:
queue_cmd(iue);
done = 0;
break;
case SRP_LOGIN_RSP:
case SRP_I_LOGOUT:
case SRP_T_LOGOUT:
case SRP_RSP:
case SRP_CRED_REQ:
case SRP_CRED_RSP:
case SRP_AER_REQ:
case SRP_AER_RSP:
eprintk("Unsupported type %u\n", opcode);
break;
default:
eprintk("Unknown type %u\n", opcode);
}
return done;
}
static void process_iu(struct viosrp_crq *crq, struct srp_target *target)
{
struct vio_port *vport = target_to_port(target);
struct iu_entry *iue;
long err;
int done = 1;
iue = srp_iu_get(target);
if (!iue) {
eprintk("Error getting IU from pool, %p\n", target);
return;
}
iue->remote_token = crq->IU_data_ptr;
err = h_copy_rdma(crq->IU_length, vport->riobn,
iue->remote_token, vport->liobn, iue->sbuf->dma);
if (err != H_SUCCESS) {
eprintk("%ld transferring data error %p\n", err, iue);
goto out;
}
if (crq->format == VIOSRP_MAD_FORMAT)
done = process_mad_iu(iue);
else
done = process_srp_iu(iue);
out:
if (done)
srp_iu_put(iue);
}
static irqreturn_t ibmvstgt_interrupt(int dummy, void *data)
{
struct srp_target *target = data;
struct vio_port *vport = target_to_port(target);
vio_disable_interrupts(vport->dma_dev);
queue_work(vtgtd, &vport->crq_work);
return IRQ_HANDLED;
}
static int crq_queue_create(struct crq_queue *queue, struct srp_target *target)
{
int err;
struct vio_port *vport = target_to_port(target);
queue->msgs = (struct viosrp_crq *) get_zeroed_page(GFP_KERNEL);
if (!queue->msgs)
goto malloc_failed;
queue->size = PAGE_SIZE / sizeof(*queue->msgs);
queue->msg_token = dma_map_single(target->dev, queue->msgs,
queue->size * sizeof(*queue->msgs),
DMA_BIDIRECTIONAL);
if (dma_mapping_error(target->dev, queue->msg_token))
goto map_failed;
err = h_reg_crq(vport->dma_dev->unit_address, queue->msg_token,
PAGE_SIZE);
/* If the adapter was left active for some reason (like kexec)
* try freeing and re-registering
*/
if (err == H_RESOURCE) {
do {
err = h_free_crq(vport->dma_dev->unit_address);
} while (err == H_BUSY || H_IS_LONG_BUSY(err));
err = h_reg_crq(vport->dma_dev->unit_address, queue->msg_token,
PAGE_SIZE);
}
if (err != H_SUCCESS && err != 2) {
eprintk("Error 0x%x opening virtual adapter\n", err);
goto reg_crq_failed;
}
err = request_irq(vport->dma_dev->irq, &ibmvstgt_interrupt,
IRQF_DISABLED, "ibmvstgt", target);
if (err)
goto req_irq_failed;
vio_enable_interrupts(vport->dma_dev);
h_send_crq(vport->dma_dev->unit_address, 0xC001000000000000, 0);
queue->cur = 0;
spin_lock_init(&queue->lock);
return 0;
req_irq_failed:
do {
err = h_free_crq(vport->dma_dev->unit_address);
} while (err == H_BUSY || H_IS_LONG_BUSY(err));
reg_crq_failed:
dma_unmap_single(target->dev, queue->msg_token,
queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
map_failed:
free_page((unsigned long) queue->msgs);
malloc_failed:
return -ENOMEM;
}
static void crq_queue_destroy(struct srp_target *target)
{
struct vio_port *vport = target_to_port(target);
struct crq_queue *queue = &vport->crq_queue;
int err;
free_irq(vport->dma_dev->irq, target);
do {
err = h_free_crq(vport->dma_dev->unit_address);
} while (err == H_BUSY || H_IS_LONG_BUSY(err));
dma_unmap_single(target->dev, queue->msg_token,
queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
free_page((unsigned long) queue->msgs);
}
static void process_crq(struct viosrp_crq *crq, struct srp_target *target)
{
struct vio_port *vport = target_to_port(target);
dprintk("%x %x\n", crq->valid, crq->format);
switch (crq->valid) {
case 0xC0:
/* initialization */
switch (crq->format) {
case 0x01:
h_send_crq(vport->dma_dev->unit_address,
0xC002000000000000, 0);
break;
case 0x02:
break;
default:
eprintk("Unknown format %u\n", crq->format);
}
break;
case 0xFF:
/* transport event */
break;
case 0x80:
/* real payload */
switch (crq->format) {
case VIOSRP_SRP_FORMAT:
case VIOSRP_MAD_FORMAT:
process_iu(crq, target);
break;
case VIOSRP_OS400_FORMAT:
case VIOSRP_AIX_FORMAT:
case VIOSRP_LINUX_FORMAT:
case VIOSRP_INLINE_FORMAT:
eprintk("Unsupported format %u\n", crq->format);
break;
default:
eprintk("Unknown format %u\n", crq->format);
}
break;
default:
eprintk("unknown message type 0x%02x!?\n", crq->valid);
}
}
static inline struct viosrp_crq *next_crq(struct crq_queue *queue)
{
struct viosrp_crq *crq;
unsigned long flags;
spin_lock_irqsave(&queue->lock, flags);
crq = &queue->msgs[queue->cur];
if (crq->valid & 0x80) {
if (++queue->cur == queue->size)
queue->cur = 0;
} else
crq = NULL;
spin_unlock_irqrestore(&queue->lock, flags);
return crq;
}
static void handle_crq(struct work_struct *work)
{
struct vio_port *vport = container_of(work, struct vio_port, crq_work);
struct srp_target *target = vport->target;
struct viosrp_crq *crq;
int done = 0;
while (!done) {
while ((crq = next_crq(&vport->crq_queue)) != NULL) {
process_crq(crq, target);
crq->valid = 0x00;
}
vio_enable_interrupts(vport->dma_dev);
crq = next_crq(&vport->crq_queue);
if (crq) {
vio_disable_interrupts(vport->dma_dev);
process_crq(crq, target);
crq->valid = 0x00;
} else
done = 1;
}
handle_cmd_queue(target);
}
static int ibmvstgt_eh_abort_handler(struct scsi_cmnd *sc)
{
unsigned long flags;
struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr;
struct srp_target *target = iue->target;
dprintk("%p %p %x\n", iue, target, vio_iu(iue)->srp.cmd.cdb[0]);
spin_lock_irqsave(&target->lock, flags);
list_del(&iue->ilist);
spin_unlock_irqrestore(&target->lock, flags);
srp_iu_put(iue);
return 0;
}
static int ibmvstgt_tsk_mgmt_response(struct Scsi_Host *shost,
u64 itn_id, u64 mid, int result)
{
struct iu_entry *iue = (struct iu_entry *) ((void *) mid);
union viosrp_iu *iu = vio_iu(iue);
unsigned char status, asc;
eprintk("%p %d\n", iue, result);
status = NO_SENSE;
asc = 0;
switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
case SRP_TSK_ABORT_TASK:
asc = 0x14;
if (result)
status = ABORTED_COMMAND;
break;
default:
break;
}
send_rsp(iue, NULL, status, asc);
srp_iu_put(iue);
return 0;
}
static int ibmvstgt_it_nexus_response(struct Scsi_Host *shost, u64 itn_id,
int result)
{
struct srp_target *target = host_to_srp_target(shost);
struct vio_port *vport = target_to_port(target);
if (result) {
eprintk("%p %d\n", shost, result);
srp_rport_del(vport->rport);
vport->rport = NULL;
}
return 0;
}
static ssize_t system_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%s\n", system_id);
}
static ssize_t partition_number_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return snprintf(buf, PAGE_SIZE, "%x\n", partition_number);
}
static ssize_t unit_address_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct srp_target *target = host_to_srp_target(shost);
struct vio_port *vport = target_to_port(target);
return snprintf(buf, PAGE_SIZE, "%x\n", vport->dma_dev->unit_address);
}
static DEVICE_ATTR(system_id, S_IRUGO, system_id_show, NULL);
static DEVICE_ATTR(partition_number, S_IRUGO, partition_number_show, NULL);
static DEVICE_ATTR(unit_address, S_IRUGO, unit_address_show, NULL);
static struct device_attribute *ibmvstgt_attrs[] = {
&dev_attr_system_id,
&dev_attr_partition_number,
&dev_attr_unit_address,
NULL,
};
static struct scsi_host_template ibmvstgt_sht = {
.name = TGT_NAME,
.module = THIS_MODULE,
.can_queue = INITIAL_SRP_LIMIT,
.sg_tablesize = SG_ALL,
.use_clustering = DISABLE_CLUSTERING,
.max_sectors = DEFAULT_MAX_SECTORS,
.transfer_response = ibmvstgt_cmd_done,
.eh_abort_handler = ibmvstgt_eh_abort_handler,
.shost_attrs = ibmvstgt_attrs,
.proc_name = TGT_NAME,
.supported_mode = MODE_TARGET,
};
static int ibmvstgt_probe(struct vio_dev *dev, const struct vio_device_id *id)
{
struct Scsi_Host *shost;
struct srp_target *target;
struct vio_port *vport;
unsigned int *dma, dma_size;
int err = -ENOMEM;
vport = kzalloc(sizeof(struct vio_port), GFP_KERNEL);
if (!vport)
return err;
shost = scsi_host_alloc(&ibmvstgt_sht, sizeof(struct srp_target));
if (!shost)
goto free_vport;
shost->transportt = ibmvstgt_transport_template;
target = host_to_srp_target(shost);
target->shost = shost;
vport->dma_dev = dev;
target->ldata = vport;
vport->target = target;
err = srp_target_alloc(target, &dev->dev, INITIAL_SRP_LIMIT,
SRP_MAX_IU_LEN);
if (err)
goto put_host;
dma = (unsigned int *) vio_get_attribute(dev, "ibm,my-dma-window",
&dma_size);
if (!dma || dma_size != 40) {
eprintk("Couldn't get window property %d\n", dma_size);
err = -EIO;
goto free_srp_target;
}
vport->liobn = dma[0];
vport->riobn = dma[5];
INIT_WORK(&vport->crq_work, handle_crq);
err = scsi_add_host(shost, target->dev);
if (err)
goto free_srp_target;
err = scsi_tgt_alloc_queue(shost);
if (err)
goto remove_host;
err = crq_queue_create(&vport->crq_queue, target);
if (err)
goto free_queue;
return 0;
free_queue:
scsi_tgt_free_queue(shost);
remove_host:
scsi_remove_host(shost);
free_srp_target:
srp_target_free(target);
put_host:
scsi_host_put(shost);
free_vport:
kfree(vport);
return err;
}
static int ibmvstgt_remove(struct vio_dev *dev)
{
struct srp_target *target = dev_get_drvdata(&dev->dev);
struct Scsi_Host *shost = target->shost;
struct vio_port *vport = target->ldata;
crq_queue_destroy(target);
srp_remove_host(shost);
scsi_remove_host(shost);
scsi_tgt_free_queue(shost);
srp_target_free(target);
kfree(vport);
scsi_host_put(shost);
return 0;
}
static struct vio_device_id ibmvstgt_device_table[] __devinitdata = {
{"v-scsi-host", "IBM,v-scsi-host"},
{"",""}
};
MODULE_DEVICE_TABLE(vio, ibmvstgt_device_table);
static struct vio_driver ibmvstgt_driver = {
.id_table = ibmvstgt_device_table,
.probe = ibmvstgt_probe,
.remove = ibmvstgt_remove,
.driver = {
.name = "ibmvscsis",
.owner = THIS_MODULE,
}
};
static int get_system_info(void)
{
struct device_node *rootdn;
const char *id, *model, *name;
const unsigned int *num;
rootdn = of_find_node_by_path("/");
if (!rootdn)
return -ENOENT;
model = of_get_property(rootdn, "model", NULL);
id = of_get_property(rootdn, "system-id", NULL);
if (model && id)
snprintf(system_id, sizeof(system_id), "%s-%s", model, id);
name = of_get_property(rootdn, "ibm,partition-name", NULL);
if (name)
strncpy(partition_name, name, sizeof(partition_name));
num = of_get_property(rootdn, "ibm,partition-no", NULL);
if (num)
partition_number = *num;
of_node_put(rootdn);
return 0;
}
static struct srp_function_template ibmvstgt_transport_functions = {
.tsk_mgmt_response = ibmvstgt_tsk_mgmt_response,
.it_nexus_response = ibmvstgt_it_nexus_response,
};
static int __init ibmvstgt_init(void)
{
int err = -ENOMEM;
printk("IBM eServer i/pSeries Virtual SCSI Target Driver\n");
ibmvstgt_transport_template =
srp_attach_transport(&ibmvstgt_transport_functions);
if (!ibmvstgt_transport_template)
return err;
vtgtd = create_workqueue("ibmvtgtd");
if (!vtgtd)
goto release_transport;
err = get_system_info();
if (err)
goto destroy_wq;
err = vio_register_driver(&ibmvstgt_driver);
if (err)
goto destroy_wq;
return 0;
destroy_wq:
destroy_workqueue(vtgtd);
release_transport:
srp_release_transport(ibmvstgt_transport_template);
return err;
}
static void __exit ibmvstgt_exit(void)
{
printk("Unregister IBM virtual SCSI driver\n");
destroy_workqueue(vtgtd);
vio_unregister_driver(&ibmvstgt_driver);
srp_release_transport(ibmvstgt_transport_template);
}
MODULE_DESCRIPTION("IBM Virtual SCSI Target");
MODULE_AUTHOR("Santiago Leon");
MODULE_LICENSE("GPL");
module_init(ibmvstgt_init);
module_exit(ibmvstgt_exit);