aic94xx_task.c

linux 内核源代码

		ts->resp = SAS_TASK_UNDELIVERED;
		ts->stat = SAS_DEV_NO_RESPONSE;
		break;

	case TC_LINK_ADM_RESP:
	case TC_CONTROL_PHY:
	case TC_RESUME:
	case TC_PARTIAL_SG_LIST:
	default:
		ASD_DPRINTK("%s: dl opcode: 0x%x?\n", __FUNCTION__, opcode);
		break;
	}

	switch (task->task_proto) {
	case SATA_PROTO:
	case SAS_PROTO_STP:
		asd_unbuild_ata_ascb(ascb);
		break;
	case SAS_PROTO_SMP:
		asd_unbuild_smp_ascb(ascb);
		break;
	case SAS_PROTO_SSP:
		asd_unbuild_ssp_ascb(ascb);
	default:
		break;
	}

	spin_lock_irqsave(&task->task_state_lock, flags);
	task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
	task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
	task->task_state_flags |= SAS_TASK_STATE_DONE;
	if (unlikely((task->task_state_flags & SAS_TASK_STATE_ABORTED))) {
		spin_unlock_irqrestore(&task->task_state_lock, flags);
		ASD_DPRINTK("task 0x%p done with opcode 0x%x resp 0x%x "
			    "stat 0x%x but aborted by upper layer!\n",
			    task, opcode, ts->resp, ts->stat);
		complete(&ascb->completion);
	} else {
		spin_unlock_irqrestore(&task->task_state_lock, flags);
		task->lldd_task = NULL;
		asd_ascb_free(ascb);
		mb();
		task->task_done(task);
	}
}

/* ---------- ATA ---------- */

static int asd_build_ata_ascb(struct asd_ascb *ascb, struct sas_task *task,
			      gfp_t gfp_flags)
{
	struct domain_device *dev = task->dev;
	struct scb *scb;
	u8     flags;
	int    res = 0;

	scb = ascb->scb;

	if (unlikely(task->ata_task.device_control_reg_update))
		scb->header.opcode = CONTROL_ATA_DEV;
	else if (dev->sata_dev.command_set == ATA_COMMAND_SET)
		scb->header.opcode = INITIATE_ATA_TASK;
	else
		scb->header.opcode = INITIATE_ATAPI_TASK;

	scb->ata_task.proto_conn_rate = (1 << 5); /* STP */
	if (dev->port->oob_mode == SAS_OOB_MODE)
		scb->ata_task.proto_conn_rate |= dev->linkrate;

	scb->ata_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
	scb->ata_task.fis = task->ata_task.fis;
	if (likely(!task->ata_task.device_control_reg_update))
		scb->ata_task.fis.flags |= 0x80; /* C=1: update ATA cmd reg */
	scb->ata_task.fis.flags &= 0xF0; /* PM_PORT field shall be 0 */
	if (dev->sata_dev.command_set == ATAPI_COMMAND_SET)
		memcpy(scb->ata_task.atapi_packet, task->ata_task.atapi_packet,
		       16);
	scb->ata_task.sister_scb = cpu_to_le16(0xFFFF);
	scb->ata_task.conn_handle = cpu_to_le16(
		(u16)(unsigned long)dev->lldd_dev);

	if (likely(!task->ata_task.device_control_reg_update)) {
		flags = 0;
		if (task->ata_task.dma_xfer)
			flags |= DATA_XFER_MODE_DMA;
		if (task->ata_task.use_ncq &&
		    dev->sata_dev.command_set != ATAPI_COMMAND_SET)
			flags |= ATA_Q_TYPE_NCQ;
		flags |= data_dir_flags[task->data_dir];
		scb->ata_task.ata_flags = flags;

		scb->ata_task.retry_count = task->ata_task.retry_count;

		flags = 0;
		if (task->ata_task.set_affil_pol)
			flags |= SET_AFFIL_POLICY;
		if (task->ata_task.stp_affil_pol)
			flags |= STP_AFFIL_POLICY;
		scb->ata_task.flags = flags;
	}
	ascb->tasklet_complete = asd_task_tasklet_complete;

	if (likely(!task->ata_task.device_control_reg_update))
		res = asd_map_scatterlist(task, scb->ata_task.sg_element,
					  gfp_flags);

	return res;
}

static void asd_unbuild_ata_ascb(struct asd_ascb *a)
{
	asd_unmap_scatterlist(a);
}

/* ---------- SMP ---------- */

static int asd_build_smp_ascb(struct asd_ascb *ascb, struct sas_task *task,
			      gfp_t gfp_flags)
{
	struct asd_ha_struct *asd_ha = ascb->ha;
	struct domain_device *dev = task->dev;
	struct scb *scb;

	pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_req, 1,
		   PCI_DMA_TODEVICE);
	pci_map_sg(asd_ha->pcidev, &task->smp_task.smp_resp, 1,
		   PCI_DMA_FROMDEVICE);

	scb = ascb->scb;

	scb->header.opcode = INITIATE_SMP_TASK;

	scb->smp_task.proto_conn_rate = dev->linkrate;

	scb->smp_task.smp_req.bus_addr =
		cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_req));
	scb->smp_task.smp_req.size =
		cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_req)-4);

	scb->smp_task.smp_resp.bus_addr =
		cpu_to_le64((u64)sg_dma_address(&task->smp_task.smp_resp));
	scb->smp_task.smp_resp.size =
		cpu_to_le32((u32)sg_dma_len(&task->smp_task.smp_resp)-4);

	scb->smp_task.sister_scb = cpu_to_le16(0xFFFF);
	scb->smp_task.conn_handle = cpu_to_le16((u16)
						(unsigned long)dev->lldd_dev);

	ascb->tasklet_complete = asd_task_tasklet_complete;

	return 0;
}

static void asd_unbuild_smp_ascb(struct asd_ascb *a)
{
	struct sas_task *task = a->uldd_task;

	BUG_ON(!task);
	pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_req, 1,
		     PCI_DMA_TODEVICE);
	pci_unmap_sg(a->ha->pcidev, &task->smp_task.smp_resp, 1,
		     PCI_DMA_FROMDEVICE);
}

/* ---------- SSP ---------- */

static int asd_build_ssp_ascb(struct asd_ascb *ascb, struct sas_task *task,
			      gfp_t gfp_flags)
{
	struct domain_device *dev = task->dev;
	struct scb *scb;
	int    res = 0;

	scb = ascb->scb;

	scb->header.opcode = INITIATE_SSP_TASK;

	scb->ssp_task.proto_conn_rate  = (1 << 4); /* SSP */
	scb->ssp_task.proto_conn_rate |= dev->linkrate;
	scb->ssp_task.total_xfer_len = cpu_to_le32(task->total_xfer_len);
	scb->ssp_task.ssp_frame.frame_type = SSP_DATA;
	memcpy(scb->ssp_task.ssp_frame.hashed_dest_addr, dev->hashed_sas_addr,
	       HASHED_SAS_ADDR_SIZE);
	memcpy(scb->ssp_task.ssp_frame.hashed_src_addr,
	       dev->port->ha->hashed_sas_addr, HASHED_SAS_ADDR_SIZE);
	scb->ssp_task.ssp_frame.tptt = cpu_to_be16(0xFFFF);

	memcpy(scb->ssp_task.ssp_cmd.lun, task->ssp_task.LUN, 8);
	if (task->ssp_task.enable_first_burst)
		scb->ssp_task.ssp_cmd.efb_prio_attr |= EFB_MASK;
	scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_prio << 3);
	scb->ssp_task.ssp_cmd.efb_prio_attr |= (task->ssp_task.task_attr & 7);
	memcpy(scb->ssp_task.ssp_cmd.cdb, task->ssp_task.cdb, 16);

	scb->ssp_task.sister_scb = cpu_to_le16(0xFFFF);
	scb->ssp_task.conn_handle = cpu_to_le16(
		(u16)(unsigned long)dev->lldd_dev);
	scb->ssp_task.data_dir = data_dir_flags[task->data_dir];
	scb->ssp_task.retry_count = scb->ssp_task.retry_count;

	ascb->tasklet_complete = asd_task_tasklet_complete;

	res = asd_map_scatterlist(task, scb->ssp_task.sg_element, gfp_flags);

	return res;
}

static void asd_unbuild_ssp_ascb(struct asd_ascb *a)
{
	asd_unmap_scatterlist(a);
}

/* ---------- Execute Task ---------- */

static inline int asd_can_queue(struct asd_ha_struct *asd_ha, int num)
{
	int res = 0;
	unsigned long flags;

	spin_lock_irqsave(&asd_ha->seq.pend_q_lock, flags);
	if ((asd_ha->seq.can_queue - num) < 0)
		res = -SAS_QUEUE_FULL;
	else
		asd_ha->seq.can_queue -= num;
	spin_unlock_irqrestore(&asd_ha->seq.pend_q_lock, flags);

	return res;
}

int asd_execute_task(struct sas_task *task, const int num,
		     gfp_t gfp_flags)
{
	int res = 0;
	LIST_HEAD(alist);
	struct sas_task *t = task;
	struct asd_ascb *ascb = NULL, *a;
	struct asd_ha_struct *asd_ha = task->dev->port->ha->lldd_ha;
	unsigned long flags;

	res = asd_can_queue(asd_ha, num);
	if (res)
		return res;

	res = num;
	ascb = asd_ascb_alloc_list(asd_ha, &res, gfp_flags);
	if (res) {
		res = -ENOMEM;
		goto out_err;
	}

	__list_add(&alist, ascb->list.prev, &ascb->list);
	list_for_each_entry(a, &alist, list) {
		a->uldd_task = t;
		t->lldd_task = a;
		t = list_entry(t->list.next, struct sas_task, list);
	}
	list_for_each_entry(a, &alist, list) {
		t = a->uldd_task;
		a->uldd_timer = 1;
		if (t->task_proto & SAS_PROTO_STP)
			t->task_proto = SAS_PROTO_STP;
		switch (t->task_proto) {
		case SATA_PROTO:
		case SAS_PROTO_STP:
			res = asd_build_ata_ascb(a, t, gfp_flags);
			break;
		case SAS_PROTO_SMP:
			res = asd_build_smp_ascb(a, t, gfp_flags);
			break;
		case SAS_PROTO_SSP:
			res = asd_build_ssp_ascb(a, t, gfp_flags);
			break;
		default:
			asd_printk("unknown sas_task proto: 0x%x\n",
				   t->task_proto);
			res = -ENOMEM;
			break;
		}
		if (res)
			goto out_err_unmap;

		spin_lock_irqsave(&t->task_state_lock, flags);
		t->task_state_flags |= SAS_TASK_AT_INITIATOR;
		spin_unlock_irqrestore(&t->task_state_lock, flags);
	}
	list_del_init(&alist);

	res = asd_post_ascb_list(asd_ha, ascb, num);
	if (unlikely(res)) {
		a = NULL;
		__list_add(&alist, ascb->list.prev, &ascb->list);
		goto out_err_unmap;
	}

	return 0;
out_err_unmap:
	{
		struct asd_ascb *b = a;
		list_for_each_entry(a, &alist, list) {
			if (a == b)
				break;
			t = a->uldd_task;
			spin_lock_irqsave(&t->task_state_lock, flags);
			t->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
			spin_unlock_irqrestore(&t->task_state_lock, flags);
			switch (t->task_proto) {
			case SATA_PROTO:
			case SAS_PROTO_STP:
				asd_unbuild_ata_ascb(a);
				break;
			case SAS_PROTO_SMP:
				asd_unbuild_smp_ascb(a);
				break;
			case SAS_PROTO_SSP:
				asd_unbuild_ssp_ascb(a);
			default:
				break;
			}
			t->lldd_task = NULL;
		}
	}
	list_del_init(&alist);
out_err:
	if (ascb)
		asd_ascb_free_list(ascb);
	asd_can_dequeue(asd_ha, num);
	return res;
}