[SCSI] scsi tgt: IBM eServer i/pSeries virtual SCSI target driver
This is IBM Virtual SCSI target driver for tgt. The driver is based on the original ibmvscsis driver: http://lkml.org/lkml/2005/10/17/99 Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: Santiago Leon <santil@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
parent
26b1482344
commit
0e5d030bef
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@ -821,6 +821,20 @@ config SCSI_IBMVSCSI
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To compile this driver as a module, choose M here: the
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module will be called ibmvscsic.
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config SCSI_IBMVSCSIS
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tristate "IBM Virtual SCSI Server support"
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depends on PPC_PSERIES && SCSI_TGT && SCSI_SRP
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help
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This is the SRP target driver for IBM pSeries virtual environments.
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The userspace component needed to initialize the driver and
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documentation can be found:
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http://stgt.berlios.de/
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To compile this driver as a module, choose M here: the
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module will be called ibmvstgt.
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config SCSI_INITIO
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tristate "Initio 9100U(W) support"
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depends on PCI && SCSI
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@ -128,6 +128,7 @@ obj-$(CONFIG_SCSI_NSP32) += nsp32.o
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obj-$(CONFIG_SCSI_IPR) += ipr.o
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obj-$(CONFIG_SCSI_SRP) += libsrp.o
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obj-$(CONFIG_SCSI_IBMVSCSI) += ibmvscsi/
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obj-$(CONFIG_SCSI_IBMVSCSIS) += ibmvscsi/
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obj-$(CONFIG_SCSI_HPTIOP) += hptiop.o
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obj-$(CONFIG_SCSI_STEX) += stex.o
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@ -3,3 +3,5 @@ obj-$(CONFIG_SCSI_IBMVSCSI) += ibmvscsic.o
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ibmvscsic-y += ibmvscsi.o
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ibmvscsic-$(CONFIG_PPC_ISERIES) += iseries_vscsi.o
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ibmvscsic-$(CONFIG_PPC_PSERIES) += rpa_vscsi.o
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obj-$(CONFIG_SCSI_IBMVSCSIS) += ibmvstgt.o
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958
drivers/scsi/ibmvscsi/ibmvstgt.c
Normal file
958
drivers/scsi/ibmvscsi/ibmvstgt.c
Normal file
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@ -0,0 +1,958 @@
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/*
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* IBM eServer i/pSeries Virtual SCSI Target Driver
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* Copyright (C) 2003-2005 Dave Boutcher (boutcher@us.ibm.com) IBM Corp.
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* Santiago Leon (santil@us.ibm.com) IBM Corp.
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* Linda Xie (lxie@us.ibm.com) IBM Corp.
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*
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* Copyright (C) 2005-2006 FUJITA Tomonori <tomof@acm.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_tgt.h>
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#include <scsi/libsrp.h>
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#include <asm/hvcall.h>
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#include <asm/iommu.h>
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#include <asm/prom.h>
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#include <asm/vio.h>
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#include "ibmvscsi.h"
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#define INITIAL_SRP_LIMIT 16
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#define DEFAULT_MAX_SECTORS 512
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#define TGT_NAME "ibmvstgt"
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/*
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* Hypervisor calls.
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*/
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#define h_copy_rdma(l, sa, sb, da, db) \
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plpar_hcall_norets(H_COPY_RDMA, l, sa, sb, da, db)
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#define h_send_crq(ua, l, h) \
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plpar_hcall_norets(H_SEND_CRQ, ua, l, h)
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#define h_reg_crq(ua, tok, sz)\
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plpar_hcall_norets(H_REG_CRQ, ua, tok, sz);
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#define h_free_crq(ua) \
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plpar_hcall_norets(H_FREE_CRQ, ua);
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/* tmp - will replace with SCSI logging stuff */
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#define eprintk(fmt, args...) \
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do { \
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printk("%s(%d) " fmt, __FUNCTION__, __LINE__, ##args); \
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} while (0)
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/* #define dprintk eprintk */
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#define dprintk(fmt, args...)
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struct vio_port {
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struct vio_dev *dma_dev;
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struct crq_queue crq_queue;
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struct work_struct crq_work;
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unsigned long liobn;
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unsigned long riobn;
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};
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static struct workqueue_struct *vtgtd;
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/*
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* These are fixed for the system and come from the Open Firmware device tree.
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* We just store them here to save getting them every time.
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*/
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static char system_id[64] = "";
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static char partition_name[97] = "UNKNOWN";
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static unsigned int partition_number = -1;
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static struct vio_port *target_to_port(struct srp_target *target)
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{
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return (struct vio_port *) target->ldata;
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}
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static inline union viosrp_iu *vio_iu(struct iu_entry *iue)
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{
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return (union viosrp_iu *) (iue->sbuf->buf);
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}
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static int send_iu(struct iu_entry *iue, uint64_t length, uint8_t format)
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{
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struct srp_target *target = iue->target;
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struct vio_port *vport = target_to_port(target);
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long rc, rc1;
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union {
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struct viosrp_crq cooked;
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uint64_t raw[2];
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} crq;
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/* First copy the SRP */
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rc = h_copy_rdma(length, vport->liobn, iue->sbuf->dma,
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vport->riobn, iue->remote_token);
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if (rc)
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eprintk("Error %ld transferring data\n", rc);
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crq.cooked.valid = 0x80;
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crq.cooked.format = format;
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crq.cooked.reserved = 0x00;
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crq.cooked.timeout = 0x00;
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crq.cooked.IU_length = length;
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crq.cooked.IU_data_ptr = vio_iu(iue)->srp.rsp.tag;
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if (rc == 0)
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crq.cooked.status = 0x99; /* Just needs to be non-zero */
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else
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crq.cooked.status = 0x00;
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rc1 = h_send_crq(vport->dma_dev->unit_address, crq.raw[0], crq.raw[1]);
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if (rc1) {
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eprintk("%ld sending response\n", rc1);
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return rc1;
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}
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return rc;
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}
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#define SRP_RSP_SENSE_DATA_LEN 18
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static int send_rsp(struct iu_entry *iue, struct scsi_cmnd *sc,
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unsigned char status, unsigned char asc)
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{
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union viosrp_iu *iu = vio_iu(iue);
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uint64_t tag = iu->srp.rsp.tag;
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/* If the linked bit is on and status is good */
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if (test_bit(V_LINKED, &iue->flags) && (status == NO_SENSE))
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status = 0x10;
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memset(iu, 0, sizeof(struct srp_rsp));
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iu->srp.rsp.opcode = SRP_RSP;
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iu->srp.rsp.req_lim_delta = 1;
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iu->srp.rsp.tag = tag;
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if (test_bit(V_DIOVER, &iue->flags))
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iu->srp.rsp.flags |= SRP_RSP_FLAG_DIOVER;
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iu->srp.rsp.data_in_res_cnt = 0;
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iu->srp.rsp.data_out_res_cnt = 0;
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iu->srp.rsp.flags &= ~SRP_RSP_FLAG_RSPVALID;
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iu->srp.rsp.resp_data_len = 0;
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iu->srp.rsp.status = status;
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if (status) {
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uint8_t *sense = iu->srp.rsp.data;
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if (sc) {
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iu->srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
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iu->srp.rsp.sense_data_len = SCSI_SENSE_BUFFERSIZE;
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memcpy(sense, sc->sense_buffer, SCSI_SENSE_BUFFERSIZE);
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} else {
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iu->srp.rsp.status = SAM_STAT_CHECK_CONDITION;
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iu->srp.rsp.flags |= SRP_RSP_FLAG_SNSVALID;
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iu->srp.rsp.sense_data_len = SRP_RSP_SENSE_DATA_LEN;
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/* Valid bit and 'current errors' */
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sense[0] = (0x1 << 7 | 0x70);
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/* Sense key */
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sense[2] = status;
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/* Additional sense length */
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sense[7] = 0xa; /* 10 bytes */
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/* Additional sense code */
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sense[12] = asc;
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}
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}
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send_iu(iue, sizeof(iu->srp.rsp) + SRP_RSP_SENSE_DATA_LEN,
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VIOSRP_SRP_FORMAT);
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return 0;
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}
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static void handle_cmd_queue(struct srp_target *target)
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{
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struct Scsi_Host *shost = target->shost;
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struct iu_entry *iue;
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struct srp_cmd *cmd;
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unsigned long flags;
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int err;
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retry:
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spin_lock_irqsave(&target->lock, flags);
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list_for_each_entry(iue, &target->cmd_queue, ilist) {
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if (!test_and_set_bit(V_FLYING, &iue->flags)) {
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spin_unlock_irqrestore(&target->lock, flags);
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cmd = iue->sbuf->buf;
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err = srp_cmd_queue(shost, cmd, iue, 0);
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if (err) {
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eprintk("cannot queue cmd %p %d\n", cmd, err);
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srp_iu_put(iue);
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}
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goto retry;
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}
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}
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spin_unlock_irqrestore(&target->lock, flags);
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}
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static int ibmvstgt_rdma(struct scsi_cmnd *sc, struct scatterlist *sg, int nsg,
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struct srp_direct_buf *md, int nmd,
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enum dma_data_direction dir, unsigned int rest)
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{
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struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr;
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struct srp_target *target = iue->target;
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struct vio_port *vport = target_to_port(target);
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dma_addr_t token;
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long err;
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unsigned int done = 0;
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int i, sidx, soff;
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sidx = soff = 0;
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token = sg_dma_address(sg + sidx);
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for (i = 0; i < nmd && rest; i++) {
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unsigned int mdone, mlen;
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mlen = min(rest, md[i].len);
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for (mdone = 0; mlen;) {
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int slen = min(sg_dma_len(sg + sidx) - soff, mlen);
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if (dir == DMA_TO_DEVICE)
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err = h_copy_rdma(slen,
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vport->riobn,
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md[i].va + mdone,
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vport->liobn,
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token + soff);
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else
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err = h_copy_rdma(slen,
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vport->liobn,
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token + soff,
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vport->riobn,
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md[i].va + mdone);
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if (err != H_SUCCESS) {
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eprintk("rdma error %d %d\n", dir, slen);
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goto out;
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}
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mlen -= slen;
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mdone += slen;
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soff += slen;
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done += slen;
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if (soff == sg_dma_len(sg + sidx)) {
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sidx++;
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soff = 0;
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token = sg_dma_address(sg + sidx);
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if (sidx > nsg) {
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eprintk("out of sg %p %d %d\n",
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iue, sidx, nsg);
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goto out;
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}
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}
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};
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rest -= mlen;
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}
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out:
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return 0;
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}
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static int ibmvstgt_transfer_data(struct scsi_cmnd *sc,
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void (*done)(struct scsi_cmnd *))
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{
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struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr;
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int err;
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err = srp_transfer_data(sc, &vio_iu(iue)->srp.cmd, ibmvstgt_rdma, 1, 1);
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done(sc);
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return err;
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}
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static int ibmvstgt_cmd_done(struct scsi_cmnd *sc,
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void (*done)(struct scsi_cmnd *))
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{
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unsigned long flags;
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struct iu_entry *iue = (struct iu_entry *) sc->SCp.ptr;
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struct srp_target *target = iue->target;
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dprintk("%p %p %x\n", iue, target, vio_iu(iue)->srp.cmd.cdb[0]);
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spin_lock_irqsave(&target->lock, flags);
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list_del(&iue->ilist);
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spin_unlock_irqrestore(&target->lock, flags);
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if (sc->result != SAM_STAT_GOOD) {
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eprintk("operation failed %p %d %x\n",
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iue, sc->result, vio_iu(iue)->srp.cmd.cdb[0]);
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send_rsp(iue, sc, HARDWARE_ERROR, 0x00);
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} else
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send_rsp(iue, sc, NO_SENSE, 0x00);
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done(sc);
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srp_iu_put(iue);
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return 0;
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}
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int send_adapter_info(struct iu_entry *iue,
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dma_addr_t remote_buffer, uint16_t length)
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{
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struct srp_target *target = iue->target;
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struct vio_port *vport = target_to_port(target);
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struct Scsi_Host *shost = target->shost;
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dma_addr_t data_token;
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struct mad_adapter_info_data *info;
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int err;
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info = dma_alloc_coherent(target->dev, sizeof(*info), &data_token,
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GFP_KERNEL);
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if (!info) {
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eprintk("bad dma_alloc_coherent %p\n", target);
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return 1;
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}
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/* Get remote info */
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err = h_copy_rdma(sizeof(*info), vport->riobn, remote_buffer,
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vport->liobn, data_token);
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if (err == H_SUCCESS) {
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dprintk("Client connect: %s (%d)\n",
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info->partition_name, info->partition_number);
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}
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memset(info, 0, sizeof(*info));
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strcpy(info->srp_version, "16.a");
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strncpy(info->partition_name, partition_name,
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sizeof(info->partition_name));
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info->partition_number = partition_number;
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info->mad_version = 1;
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info->os_type = 2;
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info->port_max_txu[0] = shost->hostt->max_sectors << 9;
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/* Send our info to remote */
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err = h_copy_rdma(sizeof(*info), vport->liobn, data_token,
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vport->riobn, remote_buffer);
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dma_free_coherent(target->dev, sizeof(*info), info, data_token);
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if (err != H_SUCCESS) {
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eprintk("Error sending adapter info %d\n", err);
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return 1;
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}
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return 0;
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}
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static void process_login(struct iu_entry *iue)
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{
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union viosrp_iu *iu = vio_iu(iue);
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struct srp_login_rsp *rsp = &iu->srp.login_rsp;
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uint64_t tag = iu->srp.rsp.tag;
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/* TODO handle case that requested size is wrong and
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* buffer format is wrong
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*/
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memset(iu, 0, sizeof(struct srp_login_rsp));
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rsp->opcode = SRP_LOGIN_RSP;
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rsp->req_lim_delta = INITIAL_SRP_LIMIT;
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rsp->tag = tag;
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rsp->max_it_iu_len = sizeof(union srp_iu);
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rsp->max_ti_iu_len = sizeof(union srp_iu);
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/* direct and indirect */
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rsp->buf_fmt = SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT;
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send_iu(iue, sizeof(*rsp), VIOSRP_SRP_FORMAT);
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}
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static inline void queue_cmd(struct iu_entry *iue)
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{
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struct srp_target *target = iue->target;
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unsigned long flags;
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spin_lock_irqsave(&target->lock, flags);
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list_add_tail(&iue->ilist, &target->cmd_queue);
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spin_unlock_irqrestore(&target->lock, flags);
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}
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static int process_tsk_mgmt(struct iu_entry *iue)
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{
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union viosrp_iu *iu = vio_iu(iue);
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int fn;
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dprintk("%p %u\n", iue, iu->srp.tsk_mgmt.tsk_mgmt_func);
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switch (iu->srp.tsk_mgmt.tsk_mgmt_func) {
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case SRP_TSK_ABORT_TASK:
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fn = ABORT_TASK;
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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);
|
Loading…
Reference in a new issue