C++ shost_priv函数代码示例

/*
 * Called from SCSI EH process context to issue a LUN_RESET TMR
 * to struct scsi_device
 */
static int tcm_loop_device_reset(struct scsi_cmnd *sc)
{
	struct tcm_loop_hba *tl_hba;
	struct tcm_loop_nexus *tl_nexus;
	struct tcm_loop_tpg *tl_tpg;
	int ret = FAILED;

	/*
	 * Locate the tcm_loop_hba_t pointer
	 */
	tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
	/*
	 * Locate the tl_nexus and se_sess pointers
	 */
	tl_nexus = tl_hba->tl_nexus;
	if (!tl_nexus) {
		pr_err("Unable to perform device reset without"
				" active I_T Nexus\n");
		return FAILED;
	}
	/*
	 * Locate the tl_tpg pointer from TargetID in sc->device->id
	 */
	tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
	ret = tcm_loop_issue_tmr(tl_tpg, tl_nexus, sc->device->lun,
				 0, TMR_LUN_RESET);
	return (ret == TMR_FUNCTION_COMPLETE) ? SUCCESS : FAILED;
}

/*
 * fnic_reset_host_stats : clears host stats
 * note : called when reset_statistics set under sysfs dir
 */
static void fnic_reset_host_stats(struct Scsi_Host *host)
{
	int ret;
	struct fc_lport *lp = shost_priv(host);
	struct fnic *fnic = lport_priv(lp);
	struct fc_host_statistics *stats;
	unsigned long flags;

	/* dump current stats, before clearing them */
	stats = fnic_get_stats(host);
	fnic_dump_fchost_stats(host, stats);

	spin_lock_irqsave(&fnic->fnic_lock, flags);
	ret = vnic_dev_stats_clear(fnic->vdev);
	spin_unlock_irqrestore(&fnic->fnic_lock, flags);

	if (ret) {
		FNIC_MAIN_DBG(KERN_DEBUG, fnic->lport->host,
				"fnic: Reset vnic stats failed"
				" 0x%x", ret);
		return;
	}
	fnic->stats_reset_time = jiffies;
	memset(stats, 0, sizeof(*stats));

	return;
}

static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
{
	struct Scsi_Host *instance = cmd->device->host;
	struct WD33C93_hostdata *hdata = shost_priv(instance);
	unsigned char flags = 0x01;
	unsigned long addr = virt_to_bus(cmd->SCp.ptr);

	/* setup dma direction */
	if (!dir_in)
		flags |= 0x04;

	/* remember direction */
	hdata->dma_dir = dir_in;

	if (dir_in) {
		/* invalidate any cache */
		cache_clear(addr, cmd->SCp.this_residual);
	} else {
		/* push any dirty cache */
		cache_push(addr, cmd->SCp.this_residual);
	}

	/* start DMA */
	m147_pcc->dma_bcr = cmd->SCp.this_residual | (1 << 24);
	m147_pcc->dma_dadr = addr;
	m147_pcc->dma_cntrl = flags;

	/* return success */
	return 0;
}

static void pvscsi_shutdown(struct pci_dev *dev)
{
	struct Scsi_Host *host = pci_get_drvdata(dev);
	struct pvscsi_adapter *adapter = shost_priv(host);

	__pvscsi_shutdown(adapter);
}

static int pvscsi_abort(struct scsi_cmnd *cmd)
{
	struct pvscsi_adapter *adapter = shost_priv(cmd->device->host);
	struct pvscsi_ctx *ctx;
	unsigned long flags;

	scmd_printk(KERN_DEBUG, cmd, "task abort on host %u, %p\n",
		    adapter->host->host_no, cmd);

	spin_lock_irqsave(&adapter->hw_lock, flags);

	/*
	 * Poll the completion ring first - we might be trying to abort
	 * a command that is waiting to be dispatched in the completion ring.
	 */
	pvscsi_process_completion_ring(adapter);

	/*
	 * If there is no context for the command, it either already succeeded
	 * or else was never properly issued.  Not our problem.
	 */
	ctx = pvscsi_find_context(adapter, cmd);
	if (!ctx) {
		scmd_printk(KERN_DEBUG, cmd, "Failed to abort cmd %p\n", cmd);
		goto out;
	}

	pvscsi_abort_cmd(adapter, ctx);

	pvscsi_process_completion_ring(adapter);

out:
	spin_unlock_irqrestore(&adapter->hw_lock, flags);
	return SUCCESS;
}

static void g_NCR5380_trigger_irq(struct Scsi_Host *instance)
{
	struct NCR5380_hostdata *hostdata = shost_priv(instance);

	/*
	 * An interrupt is triggered whenever BSY = false, SEL = true
	 * and a bit set in the SELECT_ENABLE_REG is asserted on the
	 * SCSI bus.
	 *
	 * Note that the bus is only driven when the phase control signals
	 * (I/O, C/D, and MSG) match those in the TCR.
	 */
	NCR5380_write(TARGET_COMMAND_REG,
	              PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
	NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
	NCR5380_write(INITIATOR_COMMAND_REG,
	              ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);

	msleep(1);

	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
	NCR5380_write(SELECT_ENABLE_REG, 0);
	NCR5380_write(TARGET_COMMAND_REG, 0);
}

static int pvscsi_queue(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
{
	struct Scsi_Host *host = cmd->device->host;
	struct pvscsi_adapter *adapter = shost_priv(host);
	struct pvscsi_ctx *ctx;
	unsigned long flags;

	spin_lock_irqsave(&adapter->hw_lock, flags);

	ctx = pvscsi_acquire_context(adapter, cmd);
	if (!ctx || pvscsi_queue_ring(adapter, ctx, cmd) != 0) {
		if (ctx)
			pvscsi_release_context(adapter, ctx);
		spin_unlock_irqrestore(&adapter->hw_lock, flags);
		return SCSI_MLQUEUE_HOST_BUSY;
	}

	cmd->scsi_done = done;

	dev_dbg(&cmd->device->sdev_gendev,
		"queued cmd %p, ctx %p, op=%x\n", cmd, ctx, cmd->cmnd[0]);

	spin_unlock_irqrestore(&adapter->hw_lock, flags);

	pvscsi_kick_io(adapter, cmd->cmnd[0]);

	return 0;
}

/*
 * csio_get_host_speed - Return link speed to FC transport.
 * @shost: scsi host.
 *
 */
static void
csio_get_host_speed(struct Scsi_Host *shost)
{
	struct csio_lnode *ln = shost_priv(shost);
	struct csio_hw *hw = csio_lnode_to_hw(ln);

	spin_lock_irq(&hw->lock);
	switch (hw->pport[ln->portid].link_speed) {
	case FW_PORT_CAP32_SPEED_1G:
		fc_host_speed(shost) = FC_PORTSPEED_1GBIT;
		break;
	case FW_PORT_CAP32_SPEED_10G:
		fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
		break;
	case FW_PORT_CAP32_SPEED_25G:
		fc_host_speed(shost) = FC_PORTSPEED_25GBIT;
		break;
	case FW_PORT_CAP32_SPEED_40G:
		fc_host_speed(shost) = FC_PORTSPEED_40GBIT;
		break;
	case FW_PORT_CAP32_SPEED_50G:
		fc_host_speed(shost) = FC_PORTSPEED_50GBIT;
		break;
	case FW_PORT_CAP32_SPEED_100G:
		fc_host_speed(shost) = FC_PORTSPEED_100GBIT;
		break;
	default:
		fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
		break;
	}
	spin_unlock_irq(&hw->lock);
}

static int ufs_test_run_multi_query_test(struct test_data *td)
{
	int i;
	struct scsi_device *sdev;
	struct ufs_hba *hba;

	BUG_ON(!td || !td->req_q || !td->req_q->queuedata);
	sdev = (struct scsi_device *)td->req_q->queuedata;
	BUG_ON(!sdev->host);
	hba = shost_priv(sdev->host);
	BUG_ON(!hba);

	atomic_set(&utd->outstanding_threads, 0);
	utd->fail_threads = 0;
	init_completion(&utd->outstanding_complete);
	for (i = 0; i < MAX_PARALLEL_QUERIES; ++i) {
		atomic_inc(&utd->outstanding_threads);
		async_schedule(ufs_test_random_async_query, hba);
	}

	if (!wait_for_completion_timeout(&utd->outstanding_complete,
			THREADS_COMPLETION_TIMOUT)) {
		pr_err("%s: Multi-query test timed-out %d threads left",
			__func__, atomic_read(&utd->outstanding_threads));
	}
	test_iosched_mark_test_completion();
	return 0;
}

static inline int ufs_test_pm_runtime_cfg_sync(struct test_iosched *tios,
	bool enable)
{
	struct scsi_device *sdev;
	struct ufs_hba *hba;
	int ret;

	BUG_ON(!tios || !tios->req_q || !tios->req_q->queuedata);
	sdev = (struct scsi_device *)tios->req_q->queuedata;
	BUG_ON(!sdev->host);
	hba = shost_priv(sdev->host);
	BUG_ON(!hba);

	if (enable) {
		ret = pm_runtime_get_sync(hba->dev);
		/* Positive non-zero return values are not errors */
		if (ret < 0) {
			pr_err("%s: pm_runtime_get_sync failed, ret=%d\n",
				__func__, ret);
			return ret;
		}
		return 0;
	}
	pm_runtime_put_sync(hba->dev);
	return 0;
}

static int macscsi_pwrite(struct Scsi_Host *instance,
                          unsigned char *src, int len)
{
	struct NCR5380_hostdata *hostdata = shost_priv(instance);
	unsigned char *s;
	unsigned char *d;

	NCR5380_local_declare();
	NCR5380_setup(instance);

	s = src;
	d = hostdata->pdma_base + (OUTPUT_DATA_REG << 4);

	/* These conditions are derived from MacOS */

	while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
	       (!(NCR5380_read(STATUS_REG) & SR_REQ) ||
	        (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
		;

	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
		pr_err("Error in macscsi_pwrite\n");
		return -1;
	}

	CP_MEM_TO_IO(s, d, len);

	if (len != 0) {
		pr_notice("Bus error in macscsi_pwrite\n");
		return -1;
	}

	return 0;
}

/*
 * Main entry point from struct scsi_host_template for incoming SCSI CDB+Data
 * from Linux/SCSI subsystem for SCSI low level device drivers (LLDs)
 */
static int tcm_loop_queuecommand(
	struct Scsi_Host *sh,
	struct scsi_cmnd *sc)
{
	struct se_cmd *se_cmd;
	struct se_portal_group *se_tpg;
	struct tcm_loop_hba *tl_hba;
	struct tcm_loop_tpg *tl_tpg;

	pr_debug("tcm_loop_queuecommand() %d:%d:%d:%d got CDB: 0x%02x"
		" scsi_buf_len: %u\n", sc->device->host->host_no,
		sc->device->id, sc->device->channel, sc->device->lun,
		sc->cmnd[0], scsi_bufflen(sc));
	/*
	 * Locate the tcm_loop_hba_t pointer
	 */
	tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
	tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];
	se_tpg = &tl_tpg->tl_se_tpg;
	/*
	 * Determine the SAM Task Attribute and allocate tl_cmd and
	 * tl_cmd->tl_se_cmd from TCM infrastructure
	 */
	se_cmd = tcm_loop_allocate_core_cmd(tl_hba, se_tpg, sc);
	if (!se_cmd) {
		sc->scsi_done(sc);
		return 0;
	}
	/*
	 * Queue up the newly allocated to be processed in TCM thread context.
	*/
	transport_generic_handle_cdb_map(se_cmd);
	return 0;
}

/**************************************************************************
 *   qla2x00_print_scsi_cmd
 *	 Dumps out info about the scsi cmd and srb.
 *   Input
 *	 cmd : struct scsi_cmnd
 **************************************************************************/
void
qla2x00_print_scsi_cmd(struct scsi_cmnd * cmd)
{
	int i;
	struct scsi_qla_host *ha;
	srb_t *sp;

	ha = shost_priv(cmd->device->host);

	sp = (srb_t *) cmd->SCp.ptr;
	printk("SCSI Command @=0x%p, Handle=0x%p\n", cmd, cmd->host_scribble);
	printk("  chan=0x%02x, target=0x%02x, lun=0x%02x, cmd_len=0x%02x\n",
	    cmd->device->channel, cmd->device->id, cmd->device->lun,
	    cmd->cmd_len);
	printk(" CDB: ");
	for (i = 0; i < cmd->cmd_len; i++) {
		printk("0x%02x ", cmd->cmnd[i]);
	}
	printk("\n  seg_cnt=%d, allowed=%d, retries=%d\n",
	       scsi_sg_count(cmd), cmd->allowed, cmd->retries);
	printk("  request buffer=0x%p, request buffer len=0x%x\n",
	       scsi_sglist(cmd), scsi_bufflen(cmd));
	printk("  tag=%d, transfersize=0x%x\n",
	    cmd->tag, cmd->transfersize);
	printk("  serial_number=%lx, SP=%p\n", cmd->serial_number, sp);
	printk("  data direction=%d\n", cmd->sc_data_direction);

	if (!sp)
		return;

	printk("  sp flags=0x%x\n", sp->flags);
}

static void fnic_get_host_speed(struct Scsi_Host *shost)
{
	struct fc_lport *lp = shost_priv(shost);
	struct fnic *fnic = lport_priv(lp);
	u32 port_speed = vnic_dev_port_speed(fnic->vdev);

	/* Add in other values as they get defined in fw */
	switch (port_speed) {
	case DCEM_PORTSPEED_10G:
		fc_host_speed(shost) = FC_PORTSPEED_10GBIT;
		break;
	case DCEM_PORTSPEED_20G:
		fc_host_speed(shost) = FC_PORTSPEED_20GBIT;
		break;
	case DCEM_PORTSPEED_25G:
		fc_host_speed(shost) = FC_PORTSPEED_25GBIT;
		break;
	case DCEM_PORTSPEED_40G:
	case DCEM_PORTSPEED_4x10G:
		fc_host_speed(shost) = FC_PORTSPEED_40GBIT;
		break;
	case DCEM_PORTSPEED_100G:
		fc_host_speed(shost) = FC_PORTSPEED_100GBIT;
		break;
	default:
		fc_host_speed(shost) = FC_PORTSPEED_UNKNOWN;
		break;
	}
}

static void tcm_loop_submission_work(struct work_struct *work)
{
	struct tcm_loop_cmd *tl_cmd =
		container_of(work, struct tcm_loop_cmd, work);
	struct se_cmd *se_cmd = &tl_cmd->tl_se_cmd;
	struct scsi_cmnd *sc = tl_cmd->sc;
	struct tcm_loop_nexus *tl_nexus;
	struct tcm_loop_hba *tl_hba;
	struct tcm_loop_tpg *tl_tpg;
	struct scatterlist *sgl_bidi = NULL;
	u32 sgl_bidi_count = 0;
	int rc;

	tl_hba = *(struct tcm_loop_hba **)shost_priv(sc->device->host);
	tl_tpg = &tl_hba->tl_hba_tpgs[sc->device->id];

	/*
	 * Ensure that this tl_tpg reference from the incoming sc->device->id
	 * has already been configured via tcm_loop_make_naa_tpg().
	 */
	if (!tl_tpg->tl_hba) {
		set_host_byte(sc, DID_NO_CONNECT);
		goto out_done;
	}
	if (tl_tpg->tl_transport_status == TCM_TRANSPORT_OFFLINE) {
		set_host_byte(sc, DID_TRANSPORT_DISRUPTED);
		goto out_done;
	}
	tl_nexus = tl_hba->tl_nexus;
	if (!tl_nexus) {
		scmd_printk(KERN_ERR, sc, "TCM_Loop I_T Nexus"
				" does not exist\n");
		set_host_byte(sc, DID_ERROR);
		goto out_done;
	}
	if (scsi_bidi_cmnd(sc)) {
		struct scsi_data_buffer *sdb = scsi_in(sc);

		sgl_bidi = sdb->table.sgl;
		sgl_bidi_count = sdb->table.nents;
		se_cmd->se_cmd_flags |= SCF_BIDI;

	}
	rc = target_submit_cmd_map_sgls(se_cmd, tl_nexus->se_sess, sc->cmnd,
			&tl_cmd->tl_sense_buf[0], tl_cmd->sc->device->lun,
			scsi_bufflen(sc), tcm_loop_sam_attr(sc),
			sc->sc_data_direction, 0,
			scsi_sglist(sc), scsi_sg_count(sc),
			sgl_bidi, sgl_bidi_count);
	if (rc < 0) {
		set_host_byte(sc, DID_NO_CONNECT);
		goto out_done;
	}
	return;

out_done:
	sc->scsi_done(sc);
	return;
}