diff options
Diffstat (limited to 'drivers/scsi/ibmvscsi/ibmvstgt.c')
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvstgt.c | 958 |
1 files changed, 958 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvstgt.c b/drivers/scsi/ibmvscsi/ibmvstgt.c new file mode 100644 index 00000000000..0e74174a1b3 --- /dev/null +++ b/drivers/scsi/ibmvscsi/ibmvstgt.c @@ -0,0 +1,958 @@ +/* + * 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 <scsi/scsi.h> +#include <scsi/scsi_host.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 512 + +#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, __FUNCTION__, __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; +}; + +static struct workqueue_struct *vtgtd; + +/* + * 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 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, 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\n", dir, slen); + goto out; + } + + 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); + goto out; + } + } + }; + + rest -= mlen; + } +out: + + return 0; +} + +static int ibmvstgt_transfer_data(struct scsi_cmnd *sc, + void (*done)(struct scsi_cmnd *)) +{ + struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr; + int err; + + err = srp_transfer_data(sc, &vio_iu(iue)->srp.cmd, ibmvstgt_rdma, 1, 1); + + done(sc); + + return err; +} + +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; + + 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); + + if (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; + + /* 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, 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, done; + + 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); + done = 1; + 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 irq, void *data) +{ + struct srp_target *target = (struct srp_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(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, + SA_INTERRUPT, "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(void *data) +{ + struct srp_target *target = (struct srp_target *) data; + struct vio_port *vport = target_to_port(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(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 ssize_t system_id_show(struct class_device *cdev, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%s\n", system_id); +} + +static ssize_t partition_number_show(struct class_device *cdev, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%x\n", partition_number); +} + +static ssize_t unit_address_show(struct class_device *cdev, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(cdev); + 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 CLASS_DEVICE_ATTR(system_id, S_IRUGO, system_id_show, NULL); +static CLASS_DEVICE_ATTR(partition_number, S_IRUGO, partition_number_show, NULL); +static CLASS_DEVICE_ATTR(unit_address, S_IRUGO, unit_address_show, NULL); + +static struct class_device_attribute *ibmvstgt_attrs[] = { + &class_device_attr_system_id, + &class_device_attr_partition_number, + &class_device_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, + .transfer_data = ibmvstgt_transfer_data, + .eh_abort_handler = ibmvstgt_eh_abort_handler, + .tsk_mgmt_response = ibmvstgt_tsk_mgmt_response, + .shost_attrs = ibmvstgt_attrs, + .proc_name = TGT_NAME, +}; + +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; + err = scsi_tgt_alloc_queue(shost); + if (err) + goto put_host; + + target = host_to_srp_target(shost); + target->shost = shost; + vport->dma_dev = dev; + target->ldata = vport; + 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, target); + + err = crq_queue_create(&vport->crq_queue, target); + if (err) + goto free_srp_target; + + err = scsi_add_host(shost, target->dev); + if (err) + goto destroy_queue; + return 0; + +destroy_queue: + crq_queue_destroy(target); +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 = (struct srp_target *) dev->dev.driver_data; + struct Scsi_Host *shost = target->shost; + struct vio_port *vport = target->ldata; + + crq_queue_destroy(target); + 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; + unsigned int *num; + + rootdn = find_path_device("/"); + if (!rootdn) + return -ENOENT; + + model = get_property(rootdn, "model", NULL); + id = get_property(rootdn, "system-id", NULL); + if (model && id) + snprintf(system_id, sizeof(system_id), "%s-%s", model, id); + + name = get_property(rootdn, "ibm,partition-name", NULL); + if (name) + strncpy(partition_name, name, sizeof(partition_name)); + + num = (unsigned int *) get_property(rootdn, "ibm,partition-no", NULL); + if (num) + partition_number = *num; + + return 0; +} + +static int ibmvstgt_init(void) +{ + int err = -ENOMEM; + + printk("IBM eServer i/pSeries Virtual SCSI Target Driver\n"); + + vtgtd = create_workqueue("ibmvtgtd"); + if (!vtgtd) + return err; + + 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); + return err; +} + +static void ibmvstgt_exit(void) +{ + printk("Unregister IBM virtual SCSI driver\n"); + + destroy_workqueue(vtgtd); + vio_unregister_driver(&ibmvstgt_driver); +} + +MODULE_DESCRIPTION("IBM Virtual SCSI Target"); +MODULE_AUTHOR("Santiago Leon"); +MODULE_LICENSE("GPL"); + +module_init(ibmvstgt_init); +module_exit(ibmvstgt_exit); |