diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/scsi/ibmvscsi/ibmvstgt.c | 1001 |
1 files changed, 0 insertions, 1001 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvstgt.c b/drivers/scsi/ibmvscsi/ibmvstgt.c deleted file mode 100644 index 56f8a861ed72..000000000000 --- a/drivers/scsi/ibmvscsi/ibmvstgt.c +++ /dev/null @@ -1,1001 +0,0 @@ -/* - * 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, - 0, "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[] = { - {"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, - .name = "ibmvscsis", -}; - -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); |