sas_ata.c

linux 内核源代码

		scsi_req_abort_cmd(qc->scsicmd);
		scsi_schedule_eh(qc->scsicmd->device->host);
		return;
	}

	/* Internal command, fake a timeout and complete. */
	qc->flags &= ~ATA_QCFLAG_ACTIVE;
	qc->flags |= ATA_QCFLAG_FAILED;
	qc->err_mask |= AC_ERR_TIMEOUT;
	waiting = qc->private_data;
	complete(waiting);
}

static void sas_task_timedout(unsigned long _task)
{
	struct sas_task *task = (void *) _task;
	unsigned long flags;

	spin_lock_irqsave(&task->task_state_lock, flags);
	if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
		task->task_state_flags |= SAS_TASK_STATE_ABORTED;
	spin_unlock_irqrestore(&task->task_state_lock, flags);

	complete(&task->completion);
}

static void sas_disc_task_done(struct sas_task *task)
{
	if (!del_timer(&task->timer))
		return;
	complete(&task->completion);
}

#define SAS_DEV_TIMEOUT 10

/**
 * sas_execute_task -- Basic task processing for discovery
 * @task: the task to be executed
 * @buffer: pointer to buffer to do I/O
 * @size: size of @buffer
 * @dma_dir: DMA direction.  DMA_xxx
 */
static int sas_execute_task(struct sas_task *task, void *buffer, int size,
			    enum dma_data_direction dma_dir)
{
	int res = 0;
	struct scatterlist *scatter = NULL;
	struct task_status_struct *ts = &task->task_status;
	int num_scatter = 0;
	int retries = 0;
	struct sas_internal *i =
		to_sas_internal(task->dev->port->ha->core.shost->transportt);

	if (dma_dir != DMA_NONE) {
		scatter = kzalloc(sizeof(*scatter), GFP_KERNEL);
		if (!scatter)
			goto out;

		sg_init_one(scatter, buffer, size);
		num_scatter = 1;
	}

	task->task_proto = task->dev->tproto;
	task->scatter = scatter;
	task->num_scatter = num_scatter;
	task->total_xfer_len = size;
	task->data_dir = dma_dir;
	task->task_done = sas_disc_task_done;
	if (dma_dir != DMA_NONE &&
	    sas_protocol_ata(task->task_proto)) {
		task->num_scatter = dma_map_sg(task->dev->port->ha->dev,
					       task->scatter,
					       task->num_scatter,
					       task->data_dir);
	}

	for (retries = 0; retries < 5; retries++) {
		task->task_state_flags = SAS_TASK_STATE_PENDING;
		init_completion(&task->completion);

		task->timer.data = (unsigned long) task;
		task->timer.function = sas_task_timedout;
		task->timer.expires = jiffies + SAS_DEV_TIMEOUT*HZ;
		add_timer(&task->timer);

		res = i->dft->lldd_execute_task(task, 1, GFP_KERNEL);
		if (res) {
			del_timer(&task->timer);
			SAS_DPRINTK("executing SAS discovery task failed:%d\n",
				    res);
			goto ex_err;
		}
		wait_for_completion(&task->completion);
		res = -ETASK;
		if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
			int res2;
			SAS_DPRINTK("task aborted, flags:0x%x\n",
				    task->task_state_flags);
			res2 = i->dft->lldd_abort_task(task);
			SAS_DPRINTK("came back from abort task\n");
			if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
				if (res2 == TMF_RESP_FUNC_COMPLETE)
					continue; /* Retry the task */
				else
					goto ex_err;
			}
		}
		if (task->task_status.stat == SAM_BUSY ||
			   task->task_status.stat == SAM_TASK_SET_FULL ||
			   task->task_status.stat == SAS_QUEUE_FULL) {
			SAS_DPRINTK("task: q busy, sleeping...\n");
			schedule_timeout_interruptible(HZ);
		} else if (task->task_status.stat == SAM_CHECK_COND) {
			struct scsi_sense_hdr shdr;

			if (!scsi_normalize_sense(ts->buf, ts->buf_valid_size,
						  &shdr)) {
				SAS_DPRINTK("couldn't normalize sense\n");
				continue;
			}
			if ((shdr.sense_key == 6 && shdr.asc == 0x29) ||
			    (shdr.sense_key == 2 && shdr.asc == 4 &&
			     shdr.ascq == 1)) {
				SAS_DPRINTK("device %016llx LUN: %016llx "
					    "powering up or not ready yet, "
					    "sleeping...\n",
					    SAS_ADDR(task->dev->sas_addr),
					    SAS_ADDR(task->ssp_task.LUN));

				schedule_timeout_interruptible(5*HZ);
			} else if (shdr.sense_key == 1) {
				res = 0;
				break;
			} else if (shdr.sense_key == 5) {
				break;
			} else {
				SAS_DPRINTK("dev %016llx LUN: %016llx "
					    "sense key:0x%x ASC:0x%x ASCQ:0x%x"
					    "\n",
					    SAS_ADDR(task->dev->sas_addr),
					    SAS_ADDR(task->ssp_task.LUN),
					    shdr.sense_key,
					    shdr.asc, shdr.ascq);
			}
		} else if (task->task_status.resp != SAS_TASK_COMPLETE ||
			   task->task_status.stat != SAM_GOOD) {
			SAS_DPRINTK("task finished with resp:0x%x, "
				    "stat:0x%x\n",
				    task->task_status.resp,
				    task->task_status.stat);
			goto ex_err;
		} else {
			res = 0;
			break;
		}
	}
ex_err:
	if (dma_dir != DMA_NONE) {
		if (sas_protocol_ata(task->task_proto))
			dma_unmap_sg(task->dev->port->ha->dev,
				     task->scatter, task->num_scatter,
				     task->data_dir);
		kfree(scatter);
	}
out:
	return res;
}

/* ---------- SATA ---------- */

static void sas_get_ata_command_set(struct domain_device *dev)
{
	struct dev_to_host_fis *fis =
		(struct dev_to_host_fis *) dev->frame_rcvd;

	if ((fis->sector_count == 1 && /* ATA */
	     fis->lbal         == 1 &&
	     fis->lbam         == 0 &&
	     fis->lbah         == 0 &&
	     fis->device       == 0)
	    ||
	    (fis->sector_count == 0 && /* CE-ATA (mATA) */
	     fis->lbal         == 0 &&
	     fis->lbam         == 0xCE &&
	     fis->lbah         == 0xAA &&
	     (fis->device & ~0x10) == 0))

		dev->sata_dev.command_set = ATA_COMMAND_SET;

	else if ((fis->interrupt_reason == 1 &&	/* ATAPI */
		  fis->lbal             == 1 &&
		  fis->byte_count_low   == 0x14 &&
		  fis->byte_count_high  == 0xEB &&
		  (fis->device & ~0x10) == 0))

		dev->sata_dev.command_set = ATAPI_COMMAND_SET;

	else if ((fis->sector_count == 1 && /* SEMB */
		  fis->lbal         == 1 &&
		  fis->lbam         == 0x3C &&
		  fis->lbah         == 0xC3 &&
		  fis->device       == 0)
		||
		 (fis->interrupt_reason == 1 &&	/* SATA PM */
		  fis->lbal             == 1 &&
		  fis->byte_count_low   == 0x69 &&
		  fis->byte_count_high  == 0x96 &&
		  (fis->device & ~0x10) == 0))

		/* Treat it as a superset? */
		dev->sata_dev.command_set = ATAPI_COMMAND_SET;
}

/**
 * sas_issue_ata_cmd -- Basic SATA command processing for discovery
 * @dev: the device to send the command to
 * @command: the command register
 * @features: the features register
 * @buffer: pointer to buffer to do I/O
 * @size: size of @buffer
 * @dma_dir: DMA direction.  DMA_xxx
 */
static int sas_issue_ata_cmd(struct domain_device *dev, u8 command,
			     u8 features, void *buffer, int size,
			     enum dma_data_direction dma_dir)
{
	int res = 0;
	struct sas_task *task;
	struct dev_to_host_fis *d2h_fis = (struct dev_to_host_fis *)
		&dev->frame_rcvd[0];

	res = -ENOMEM;
	task = sas_alloc_task(GFP_KERNEL);
	if (!task)
		goto out;

	task->dev = dev;

	task->ata_task.fis.fis_type = 0x27;
	task->ata_task.fis.command = command;
	task->ata_task.fis.features = features;
	task->ata_task.fis.device = d2h_fis->device;
	task->ata_task.retry_count = 1;

	res = sas_execute_task(task, buffer, size, dma_dir);

	sas_free_task(task);
out:
	return res;
}

static void sas_sata_propagate_sas_addr(struct domain_device *dev)
{
	unsigned long flags;
	struct asd_sas_port *port = dev->port;
	struct asd_sas_phy  *phy;

	BUG_ON(dev->parent);

	memcpy(port->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
	spin_lock_irqsave(&port->phy_list_lock, flags);
	list_for_each_entry(phy, &port->phy_list, port_phy_el)
		memcpy(phy->attached_sas_addr, dev->sas_addr, SAS_ADDR_SIZE);
	spin_unlock_irqrestore(&port->phy_list_lock, flags);
}

#define ATA_IDENTIFY_DEV         0xEC
#define ATA_IDENTIFY_PACKET_DEV  0xA1
#define ATA_SET_FEATURES         0xEF
#define ATA_FEATURE_PUP_STBY_SPIN_UP 0x07

/**
 * sas_discover_sata_dev -- discover a STP/SATA device (SATA_DEV)
 * @dev: STP/SATA device of interest (ATA/ATAPI)
 *
 * The LLDD has already been notified of this device, so that we can
 * send FISes to it.  Here we try to get IDENTIFY DEVICE or IDENTIFY
 * PACKET DEVICE, if ATAPI device, so that the LLDD can fine-tune its
 * performance for this device.
 */
static int sas_discover_sata_dev(struct domain_device *dev)
{
	int     res;
	__le16  *identify_x;
	u8      command;

	identify_x = kzalloc(512, GFP_KERNEL);
	if (!identify_x)
		return -ENOMEM;

	if (dev->sata_dev.command_set == ATA_COMMAND_SET) {
		dev->sata_dev.identify_device = identify_x;
		command = ATA_IDENTIFY_DEV;
	} else {
		dev->sata_dev.identify_packet_device = identify_x;
		command = ATA_IDENTIFY_PACKET_DEV;
	}

	res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
				DMA_FROM_DEVICE);
	if (res)
		goto out_err;

	/* lives on the media? */
	if (le16_to_cpu(identify_x[0]) & 4) {
		/* incomplete response */
		SAS_DPRINTK("sending SET FEATURE/PUP_STBY_SPIN_UP to "
			    "dev %llx\n", SAS_ADDR(dev->sas_addr));
		if (!le16_to_cpu(identify_x[83] & (1<<6)))
			goto cont1;
		res = sas_issue_ata_cmd(dev, ATA_SET_FEATURES,
					ATA_FEATURE_PUP_STBY_SPIN_UP,
					NULL, 0, DMA_NONE);
		if (res)
			goto cont1;

		schedule_timeout_interruptible(5*HZ); /* More time? */
		res = sas_issue_ata_cmd(dev, command, 0, identify_x, 512,
					DMA_FROM_DEVICE);
		if (res)
			goto out_err;
	}
cont1:
	/* Get WWN */
	if (dev->port->oob_mode != SATA_OOB_MODE) {
		memcpy(dev->sas_addr, dev->sata_dev.rps_resp.rps.stp_sas_addr,
		       SAS_ADDR_SIZE);
	} else if (dev->sata_dev.command_set == ATA_COMMAND_SET &&
		   (le16_to_cpu(dev->sata_dev.identify_device[108]) & 0xF000)
		   == 0x5000) {
		int i;

		for (i = 0; i < 4; i++) {
			dev->sas_addr[2*i] =
	     (le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0xFF00) >> 8;
			dev->sas_addr[2*i+1] =
	      le16_to_cpu(dev->sata_dev.identify_device[108+i]) & 0x00FF;
		}
	}
	sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr);
	if (!dev->parent)
		sas_sata_propagate_sas_addr(dev);

	/* XXX Hint: register this SATA device with SATL.
	   When this returns, dev->sata_dev->lu is alive and
	   present.
	sas_satl_register_dev(dev);
	*/

	sas_fill_in_rphy(dev, dev->rphy);

	return 0;
out_err:
	dev->sata_dev.identify_packet_device = NULL;
	dev->sata_dev.identify_device = NULL;
	kfree(identify_x);
	return res;
}

static int sas_discover_sata_pm(struct domain_device *dev)
{
	return -ENODEV;
}

/**
 * sas_discover_sata -- discover an STP/SATA domain device
 * @dev: pointer to struct domain_device of interest
 *
 * First we notify the LLDD of this device, so we can send frames to
 * it.  Then depending on the type of device we call the appropriate
 * discover functions.  Once device discover is done, we notify the
 * LLDD so that it can fine-tune its parameters for the device, by
 * removing it and then adding it.  That is, the second time around,
 * the driver would have certain fields, that it is looking at, set.
 * Finally we initialize the kobj so that the device can be added to
 * the system at registration time.  Devices directly attached to a HA
 * port, have no parents.  All other devices do, and should have their
 * "parent" pointer set appropriately before calling this function.
 */
int sas_discover_sata(struct domain_device *dev)
{
	int res;

	sas_get_ata_command_set(dev);

	res = sas_notify_lldd_dev_found(dev);
	if (res)
		return res;

	switch (dev->dev_type) {
	case SATA_DEV:
		res = sas_discover_sata_dev(dev);
		break;
	case SATA_PM:
		res = sas_discover_sata_pm(dev);
		break;
	default:
		break;
	}
	sas_notify_lldd_dev_gone(dev);
	if (!res) {
		sas_notify_lldd_dev_found(dev);
		res = sas_rphy_add(dev->rphy);
	}

	return res;
}