megaraid_mbox.c

linux-2.6.15.6

	memcpy(epthru->cdb, scp->cmnd, scp->cmd_len);

	if (scp->request_bufflen) {
		epthru->dataxferlen	= scp->request_bufflen;
		epthru->dataxferaddr	= ccb->sgl_dma_h;
		epthru->numsge		= megaraid_mbox_mksgl(adapter, scb);
	}
	else {
		epthru->dataxferaddr	= 0;
		epthru->dataxferlen	= 0;
		epthru->numsge		= 0;
	}
	return;
}


/**
 * megaraid_ack_sequence - interrupt ack sequence for memory mapped HBAs
 * @adapter	- controller's soft state
 *
 * Interrupt ackrowledgement sequence for memory mapped HBAs. Find out the
 * completed command and put them on the completed list for later processing.
 *
 * Returns:	1 if the interrupt is valid, 0 otherwise
 */
static inline int
megaraid_ack_sequence(adapter_t *adapter)
{
	mraid_device_t		*raid_dev = ADAP2RAIDDEV(adapter);
	mbox_t			*mbox;
	scb_t			*scb;
	uint8_t			nstatus;
	uint8_t			completed[MBOX_MAX_FIRMWARE_STATUS];
	struct list_head	clist;
	int			handled;
	uint32_t		dword;
	unsigned long		flags;
	int			i, j;


	mbox	= raid_dev->mbox;

	// move the SCBs from the firmware completed array to our local list
	INIT_LIST_HEAD(&clist);

	// loop till F/W has more commands for us to complete
	handled = 0;
	spin_lock_irqsave(MAILBOX_LOCK(raid_dev), flags);
	do {
		/*
		 * Check if a valid interrupt is pending. If found, force the
		 * interrupt line low.
		 */
		dword = RDOUTDOOR(raid_dev);
		if (dword != 0x10001234) break;

		handled = 1;

		WROUTDOOR(raid_dev, 0x10001234);

		nstatus = 0;
		// wait for valid numstatus to post
		for (i = 0; i < 0xFFFFF; i++) {
			if (mbox->numstatus != 0xFF) {
				nstatus = mbox->numstatus;
				break;
			}
			rmb();
		}
		mbox->numstatus = 0xFF;

		adapter->outstanding_cmds -= nstatus;

		for (i = 0; i < nstatus; i++) {

			// wait for valid command index to post
			for (j = 0; j < 0xFFFFF; j++) {
				if (mbox->completed[i] != 0xFF) break;
				rmb();
			}
			completed[i]		= mbox->completed[i];
			mbox->completed[i]	= 0xFF;

			if (completed[i] == 0xFF) {
				con_log(CL_ANN, (KERN_CRIT
				"megaraid: command posting timed out\n"));

				BUG();
				continue;
			}

			// Get SCB associated with this command id
			if (completed[i] >= MBOX_MAX_SCSI_CMDS) {
				// a cmm command
				scb = adapter->uscb_list + (completed[i] -
						MBOX_MAX_SCSI_CMDS);
			}
			else {
				// an os command
				scb = adapter->kscb_list + completed[i];
			}

			scb->status = mbox->status;
			list_add_tail(&scb->list, &clist);
		}

		// Acknowledge interrupt
		WRINDOOR(raid_dev, 0x02);

	} while(1);

	spin_unlock_irqrestore(MAILBOX_LOCK(raid_dev), flags);


	// put the completed commands in the completed list. DPC would
	// complete these commands later
	spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);

	list_splice(&clist, &adapter->completed_list);

	spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);


	// schedule the DPC if there is some work for it
	if (handled)
		tasklet_schedule(&adapter->dpc_h);

	return handled;
}


/**
 * megaraid_isr - isr for memory based mailbox based controllers
 * @irq		- irq
 * @devp	- pointer to our soft state
 * @regs	- unused
 *
 * Interrupt service routine for memory-mapped mailbox controllers.
 */
static irqreturn_t
megaraid_isr(int irq, void *devp, struct pt_regs *regs)
{
	adapter_t	*adapter = devp;
	int		handled;

	handled = megaraid_ack_sequence(adapter);

	/* Loop through any pending requests */
	if (!adapter->quiescent) {
		megaraid_mbox_runpendq(adapter, NULL);
	}

	return IRQ_RETVAL(handled);
}


/**
 * megaraid_mbox_sync_scb - sync kernel buffers
 * @adapter	: controller's soft state
 * @scb		: pointer to the resource packet
 *
 * DMA sync if required.
 */
static inline void
megaraid_mbox_sync_scb(adapter_t *adapter, scb_t *scb)
{
	mbox_ccb_t	*ccb;

	ccb	= (mbox_ccb_t *)scb->ccb;

	switch (scb->dma_type) {

	case MRAID_DMA_WBUF:
		if (scb->dma_direction == PCI_DMA_FROMDEVICE) {
			pci_dma_sync_single_for_cpu(adapter->pdev,
					ccb->buf_dma_h,
					scb->scp->request_bufflen,
					PCI_DMA_FROMDEVICE);
		}

		pci_unmap_page(adapter->pdev, ccb->buf_dma_h,
			scb->scp->request_bufflen, scb->dma_direction);

		break;

	case MRAID_DMA_WSG:
		if (scb->dma_direction == PCI_DMA_FROMDEVICE) {
			pci_dma_sync_sg_for_cpu(adapter->pdev,
					scb->scp->request_buffer,
					scb->scp->use_sg, PCI_DMA_FROMDEVICE);
		}

		pci_unmap_sg(adapter->pdev, scb->scp->request_buffer,
			scb->scp->use_sg, scb->dma_direction);

		break;

	default:
		break;
	}

	return;
}


/**
 * megaraid_mbox_dpc - the tasklet to complete the commands from completed list
 * @devp	: pointer to HBA soft state
 *
 * Pick up the commands from the completed list and send back to the owners.
 * This is a reentrant function and does not assume any locks are held while
 * it is being called.
 */
static void
megaraid_mbox_dpc(unsigned long devp)
{
	adapter_t		*adapter = (adapter_t *)devp;
	mraid_device_t		*raid_dev;
	struct list_head	clist;
	struct scatterlist	*sgl;
	scb_t			*scb;
	scb_t			*tmp;
	struct scsi_cmnd	*scp;
	mraid_passthru_t	*pthru;
	mraid_epassthru_t	*epthru;
	mbox_ccb_t		*ccb;
	int			islogical;
	int			pdev_index;
	int			pdev_state;
	mbox_t			*mbox;
	unsigned long		flags;
	uint8_t			c;
	int			status;


	if (!adapter) return;

	raid_dev = ADAP2RAIDDEV(adapter);

	// move the SCBs from the completed list to our local list
	INIT_LIST_HEAD(&clist);

	spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);

	list_splice_init(&adapter->completed_list, &clist);

	spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);


	list_for_each_entry_safe(scb, tmp, &clist, list) {

		status		= scb->status;
		scp		= scb->scp;
		ccb		= (mbox_ccb_t *)scb->ccb;
		pthru		= ccb->pthru;
		epthru		= ccb->epthru;
		mbox		= ccb->mbox;

		// Make sure f/w has completed a valid command
		if (scb->state != SCB_ISSUED) {
			con_log(CL_ANN, (KERN_CRIT
			"megaraid critical err: invalid command %d:%d:%p\n",
				scb->sno, scb->state, scp));
			BUG();
			continue;	// Must never happen!
		}

		// check for the management command and complete it right away
		if (scb->sno >= MBOX_MAX_SCSI_CMDS) {
			scb->state	= SCB_FREE;
			scb->status	= status;

			// remove from local clist
			list_del_init(&scb->list);

			megaraid_mbox_mm_done(adapter, scb);

			continue;
		}

		// Was an abort issued for this command earlier
		if (scb->state & SCB_ABORT) {
			con_log(CL_ANN, (KERN_NOTICE
			"megaraid: aborted cmd %lx[%x] completed\n",
				scp->serial_number, scb->sno));
		}

		/*
		 * If the inquiry came of a disk drive which is not part of
		 * any RAID array, expose it to the kernel. For this to be
		 * enabled, user must set the "megaraid_expose_unconf_disks"
		 * flag to 1 by specifying it on module parameter list.
		 * This would enable data migration off drives from other
		 * configurations.
		 */
		islogical = MRAID_IS_LOGICAL(adapter, scp);
		if (scp->cmnd[0] == INQUIRY && status == 0 && islogical == 0
				&& IS_RAID_CH(raid_dev, scb->dev_channel)) {

			if (scp->use_sg) {
				sgl = (struct scatterlist *)
					scp->request_buffer;

				if (sgl->page) {
					c = *(unsigned char *)
					(page_address((&sgl[0])->page) +
						(&sgl[0])->offset);
				}
				else {
					con_log(CL_ANN, (KERN_WARNING
					"megaraid mailbox: invalid sg:%d\n",
					__LINE__));
					c = 0;
				}
			}
			else {
				c = *(uint8_t *)scp->request_buffer;
			}

			if ((c & 0x1F ) == TYPE_DISK) {
				pdev_index = (scb->dev_channel * 16) +
					scb->dev_target;
				pdev_state =
					raid_dev->pdrv_state[pdev_index] & 0x0F;

				if (pdev_state == PDRV_ONLINE		||
					pdev_state == PDRV_FAILED	||
					pdev_state == PDRV_RBLD		||
					pdev_state == PDRV_HOTSPARE	||
					megaraid_expose_unconf_disks == 0) {

					status = 0xF0;
				}
			}
		}

		// Convert MegaRAID status to Linux error code
		switch (status) {

		case 0x00:

			scp->result = (DID_OK << 16);
			break;

		case 0x02:

			/* set sense_buffer and result fields */
			if (mbox->cmd == MBOXCMD_PASSTHRU ||
				mbox->cmd == MBOXCMD_PASSTHRU64) {

				memcpy(scp->sense_buffer, pthru->reqsensearea,
						14);

				scp->result = DRIVER_SENSE << 24 |
					DID_OK << 16 | CHECK_CONDITION << 1;
			}
			else {
				if (mbox->cmd == MBOXCMD_EXTPTHRU) {

					memcpy(scp->sense_buffer,
						epthru->reqsensearea, 14);

					scp->result = DRIVER_SENSE << 24 |
						DID_OK << 16 |
						CHECK_CONDITION << 1;
				} else {
					scp->sense_buffer[0] = 0x70;
					scp->sense_buffer[2] = ABORTED_COMMAND;
					scp->result = CHECK_CONDITION << 1;
				}
			}
			break;

		case 0x08:

			scp->result = DID_BUS_BUSY << 16 | status;
			break;

		default:

			/*
			 * If TEST_UNIT_READY fails, we know RESERVATION_STATUS
			 * failed
			 */
			if (scp->cmnd[0] == TEST_UNIT_READY) {
				scp->result = DID_ERROR << 16 |
					RESERVATION_CONFLICT << 1;
			}
			else
			/*
			 * Error code returned is 1 if Reserve or Release
			 * failed or the input parameter is invalid
			 */
			if (status == 1 && (scp->cmnd[0] == RESERVE ||
					 scp->cmnd[0] == RELEASE)) {

				scp->result = DID_ERROR << 16 |
					RESERVATION_CONFLICT << 1;
			}
			else {
				scp->result = DID_BAD_TARGET << 16 | status;
			}
		}

		// print a debug message for all failed commands
		if (status) {
			megaraid_mbox_display_scb(adapter, scb);
		}

		// Free our internal resources and call the mid-layer callback
		// routine
		megaraid_mbox_sync_scb(adapter, scb);

		// remove from local clist
		list_del_init(&scb->list);

		// put back in free list
		megaraid_dealloc_scb(adapter, scb);

		// send the scsi packet back to kernel
		scp->scsi_done(scp);
	}

	return;
}


/**
 * megaraid_abort_handler - abort the scsi command
 * @scp		: command to be aborted
 *
 * Abort a previous SCSI request. Only commands on the pending list can be
 * aborted. All the commands issued to the F/W must complete.
 **/
static int
megaraid_abort_handler(struct scsi_cmnd *scp)
{
	adapter_t		*adapter;
	mraid_device_t		*raid_dev;
	scb_t			*scb;
	scb_t			*tmp;
	int			found;
	unsigned long		flags;
	int			i;


	adapter		= SCP2ADAPTER(scp);
	raid_dev	= ADAP2RAIDDEV(adapter);

	con_log(CL_ANN, (KERN_WARNING
		"megaraid: aborting-%ld cmd=%x <c=%d t=%d l=%d>\n",
		scp->serial_number, scp->cmnd[0], SCP2CHANNEL(scp),
		SCP2TARGET(scp), SCP2LUN(scp)));

	// If FW has stopped responding, simply return failure
	if (raid_dev->hw_error) {
		con_log(CL_ANN, (KERN_NOTICE
			"megaraid: hw error, not aborting\n"));
		return FAILED;
	}

	// There might a race here, where the command was completed by the
	// firmware and now it is on the completed list. Before we could
	// complete the command to the kernel in dpc, the abort came.
	// Find out if this is the case to avoid the race.
	scb = NULL;
	spin_lock_irqsave(COMPLETED_LIST_LOCK(adapter), flags);
	list_for_each_entry_safe(scb, tmp, &adapter->completed_list, list) {

		if (scb->scp == scp) {	// Found command

			list_del_init(&scb->list);	// from completed list

			con_log(CL_ANN, (KERN_WARNING
			"megaraid: %ld:%d[%d:%d], abort from completed list\n",
				scp->serial_number, scb->sno,
				scb->dev_channel, scb->dev_target));

			scp->result = (DID_ABORT << 16);
			scp->scsi_done(scp);

			megaraid_dealloc_scb(adapter, scb);

			spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter),
				flags);

			return SUCCESS;
		}
	}
	spin_unlock_irqrestore(COMPLETED_LIST_LOCK(adapter), flags);


	// Find out if this command is still on the pending list. If it is and
	// was never issued, abort and return success. If the command is owned
	// by the firmware, we must wait for it to complete by the FW.
	spin_lock_irqsave(PENDING_LIST_LOCK(adapter), flags);
	list_for_each_entry_safe(scb, tmp, &adapter->pend_list, list) {

		if (scb->scp == scp) {	// Found command

			list_del_init(&scb->list);	// from pending list

			ASSERT(!(scb->state & SCB_ISSUED));

			con_log(CL_ANN, (KERN_WARNING
				"megaraid abort: %ld[%d:%d], driver owner\n",
				scp->serial_number, scb->dev_channel,
				scb->dev_target));

			scp->result = (DID_ABORT << 16);
			scp->scsi_done(scp);

			megaraid_dealloc_scb(adapter, scb);

			spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter),
				flags);

			return SUCCESS;
		}
	}
	spin_unlock_irqrestore(PENDING_LIST_LOCK(adapter), flags);


	// Check do