megaraid_sas.c

linux-2.6.15.6

	sge_sz = (IS_DMA64) ? sizeof(struct megasas_sge64) :
	    sizeof(struct megasas_sge32);

	if (IS_DMA64) {
		ldio->flags |= MFI_FRAME_SGL64;
		ldio->sge_count = megasas_make_sgl64(instance, scp, &ldio->sgl);
	} else
		ldio->sge_count = megasas_make_sgl32(instance, scp, &ldio->sgl);

	/*
	 * Sense info specific
	 */
	ldio->sense_len = SCSI_SENSE_BUFFERSIZE;
	ldio->sense_buf_phys_addr_hi = 0;
	ldio->sense_buf_phys_addr_lo = cmd->sense_phys_addr;

	sge_bytes = sge_sz * ldio->sge_count;

	cmd->frame_count = (sge_bytes / MEGAMFI_FRAME_SIZE) +
	    ((sge_bytes % MEGAMFI_FRAME_SIZE) ? 1 : 0) + 1;

	if (cmd->frame_count > 7)
		cmd->frame_count = 8;

	return cmd->frame_count;
}

/**
 * megasas_build_cmd -	Prepares a command packet
 * @instance:		Adapter soft state
 * @scp:		SCSI command
 * @frame_count:	[OUT] Number of frames used to prepare this command
 */
static inline struct megasas_cmd *megasas_build_cmd(struct megasas_instance
						    *instance,
						    struct scsi_cmnd *scp,
						    int *frame_count)
{
	u32 logical_cmd;
	struct megasas_cmd *cmd;

	/*
	 * Find out if this is logical or physical drive command.
	 */
	logical_cmd = MEGASAS_IS_LOGICAL(scp);

	/*
	 * Logical drive command
	 */
	if (logical_cmd) {

		if (scp->device->id >= MEGASAS_MAX_LD) {
			scp->result = DID_BAD_TARGET << 16;
			return NULL;
		}

		switch (scp->cmnd[0]) {

		case READ_10:
		case WRITE_10:
		case READ_12:
		case WRITE_12:
		case READ_6:
		case WRITE_6:
		case READ_16:
		case WRITE_16:
			/*
			 * Fail for LUN > 0
			 */
			if (scp->device->lun) {
				scp->result = DID_BAD_TARGET << 16;
				return NULL;
			}

			cmd = megasas_get_cmd(instance);

			if (!cmd) {
				scp->result = DID_IMM_RETRY << 16;
				return NULL;
			}

			*frame_count = megasas_build_ldio(instance, scp, cmd);

			if (!(*frame_count)) {
				megasas_return_cmd(instance, cmd);
				return NULL;
			}

			return cmd;

		default:
			/*
			 * Fail for LUN > 0
			 */
			if (scp->device->lun) {
				scp->result = DID_BAD_TARGET << 16;
				return NULL;
			}

			cmd = megasas_get_cmd(instance);

			if (!cmd) {
				scp->result = DID_IMM_RETRY << 16;
				return NULL;
			}

			*frame_count = megasas_build_dcdb(instance, scp, cmd);

			if (!(*frame_count)) {
				megasas_return_cmd(instance, cmd);
				return NULL;
			}

			return cmd;
		}
	} else {
		cmd = megasas_get_cmd(instance);

		if (!cmd) {
			scp->result = DID_IMM_RETRY << 16;
			return NULL;
		}

		*frame_count = megasas_build_dcdb(instance, scp, cmd);

		if (!(*frame_count)) {
			megasas_return_cmd(instance, cmd);
			return NULL;
		}

		return cmd;
	}

	return NULL;
}

/**
 * megasas_queue_command -	Queue entry point
 * @scmd:			SCSI command to be queued
 * @done:			Callback entry point
 */
static int
megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
{
	u32 frame_count;
	unsigned long flags;
	struct megasas_cmd *cmd;
	struct megasas_instance *instance;

	instance = (struct megasas_instance *)
	    scmd->device->host->hostdata;
	scmd->scsi_done = done;
	scmd->result = 0;

	cmd = megasas_build_cmd(instance, scmd, &frame_count);

	if (!cmd) {
		done(scmd);
		return 0;
	}

	cmd->scmd = scmd;
	scmd->SCp.ptr = (char *)cmd;
	scmd->SCp.sent_command = jiffies;

	/*
	 * Issue the command to the FW
	 */
	spin_lock_irqsave(&instance->instance_lock, flags);
	instance->fw_outstanding++;
	spin_unlock_irqrestore(&instance->instance_lock, flags);

	writel(((cmd->frame_phys_addr >> 3) | (cmd->frame_count - 1)),
	       &instance->reg_set->inbound_queue_port);

	return 0;
}

/**
 * megasas_wait_for_outstanding -	Wait for all outstanding cmds
 * @instance:				Adapter soft state
 *
 * This function waits for upto MEGASAS_RESET_WAIT_TIME seconds for FW to
 * complete all its outstanding commands. Returns error if one or more IOs
 * are pending after this time period. It also marks the controller dead.
 */
static int megasas_wait_for_outstanding(struct megasas_instance *instance)
{
	int i;
	u32 wait_time = MEGASAS_RESET_WAIT_TIME;

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

		if (!instance->fw_outstanding)
			break;

		if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
			printk(KERN_NOTICE "megasas: [%2d]waiting for %d "
			       "commands to complete\n", i,
			       instance->fw_outstanding);
		}

		msleep(1000);
	}

	if (instance->fw_outstanding) {
		instance->hw_crit_error = 1;
		return FAILED;
	}

	return SUCCESS;
}

/**
 * megasas_generic_reset -	Generic reset routine
 * @scmd:			Mid-layer SCSI command
 *
 * This routine implements a generic reset handler for device, bus and host
 * reset requests. Device, bus and host specific reset handlers can use this
 * function after they do their specific tasks.
 */
static int megasas_generic_reset(struct scsi_cmnd *scmd)
{
	int ret_val;
	struct megasas_instance *instance;

	instance = (struct megasas_instance *)scmd->device->host->hostdata;

	scmd_printk(KERN_NOTICE, scmd, "megasas: RESET -%ld cmd=%x\n",
	       scmd->serial_number, scmd->cmnd[0]);

	if (instance->hw_crit_error) {
		printk(KERN_ERR "megasas: cannot recover from previous reset "
		       "failures\n");
		return FAILED;
	}

	ret_val = megasas_wait_for_outstanding(instance);
	if (ret_val == SUCCESS)
		printk(KERN_NOTICE "megasas: reset successful \n");
	else
		printk(KERN_ERR "megasas: failed to do reset\n");

	return ret_val;
}

static enum scsi_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
{
	unsigned long seconds;

	if (scmd->SCp.ptr) {
		seconds = (jiffies - scmd->SCp.sent_command) / HZ;

		if (seconds < 90) {
			return EH_RESET_TIMER;
		} else {
			return EH_NOT_HANDLED;
		}
	}

	return EH_HANDLED;
}

/**
 * megasas_reset_device -	Device reset handler entry point
 */
static int megasas_reset_device(struct scsi_cmnd *scmd)
{
	int ret;

	/*
	 * First wait for all commands to complete
	 */
	ret = megasas_generic_reset(scmd);

	return ret;
}

/**
 * megasas_reset_bus_host -	Bus & host reset handler entry point
 */
static int megasas_reset_bus_host(struct scsi_cmnd *scmd)
{
	int ret;

	/*
	 * Frist wait for all commands to complete
	 */
	ret = megasas_generic_reset(scmd);

	return ret;
}

/**
 * megasas_service_aen -	Processes an event notification
 * @instance:			Adapter soft state
 * @cmd:			AEN command completed by the ISR
 *
 * For AEN, driver sends a command down to FW that is held by the FW till an
 * event occurs. When an event of interest occurs, FW completes the command
 * that it was previously holding.
 *
 * This routines sends SIGIO signal to processes that have registered with the
 * driver for AEN.
 */
static void
megasas_service_aen(struct megasas_instance *instance, struct megasas_cmd *cmd)
{
	/*
	 * Don't signal app if it is just an aborted previously registered aen
	 */
	if (!cmd->abort_aen)
		kill_fasync(&megasas_async_queue, SIGIO, POLL_IN);
	else
		cmd->abort_aen = 0;

	instance->aen_cmd = NULL;
	megasas_return_cmd(instance, cmd);
}

/*
 * Scsi host template for megaraid_sas driver
 */
static struct scsi_host_template megasas_template = {

	.module = THIS_MODULE,
	.name = "LSI Logic SAS based MegaRAID driver",
	.proc_name = "megaraid_sas",
	.queuecommand = megasas_queue_command,
	.eh_device_reset_handler = megasas_reset_device,
	.eh_bus_reset_handler = megasas_reset_bus_host,
	.eh_host_reset_handler = megasas_reset_bus_host,
	.eh_timed_out = megasas_reset_timer,
	.use_clustering = ENABLE_CLUSTERING,
};

/**
 * megasas_complete_int_cmd -	Completes an internal command
 * @instance:			Adapter soft state
 * @cmd:			Command to be completed
 *
 * The megasas_issue_blocked_cmd() function waits for a command to complete
 * after it issues a command. This function wakes up that waiting routine by
 * calling wake_up() on the wait queue.
 */
static void
megasas_complete_int_cmd(struct megasas_instance *instance,
			 struct megasas_cmd *cmd)
{
	cmd->cmd_status = cmd->frame->io.cmd_status;

	if (cmd->cmd_status == ENODATA) {
		cmd->cmd_status = 0;
	}
	wake_up(&instance->int_cmd_wait_q);
}

/**
 * megasas_complete_abort -	Completes aborting a command
 * @instance:			Adapter soft state
 * @cmd:			Cmd that was issued to abort another cmd
 *
 * The megasas_issue_blocked_abort_cmd() function waits on abort_cmd_wait_q 
 * after it issues an abort on a previously issued command. This function 
 * wakes up all functions waiting on the same wait queue.
 */
static void
megasas_complete_abort(struct megasas_instance *instance,
		       struct megasas_cmd *cmd)
{
	if (cmd->sync_cmd) {
		cmd->sync_cmd = 0;
		cmd->cmd_status = 0;
		wake_up(&instance->abort_cmd_wait_q);
	}

	return;
}

/**
 * megasas_unmap_sgbuf -	Unmap SG buffers
 * @instance:			Adapter soft state
 * @cmd:			Completed command
 */
static inline void
megasas_unmap_sgbuf(struct megasas_instance *instance, struct megasas_cmd *cmd)
{
	dma_addr_t buf_h;
	u8 opcode;

	if (cmd->scmd->use_sg) {
		pci_unmap_sg(instance->pdev, cmd->scmd->request_buffer,
			     cmd->scmd->use_sg, cmd->scmd->sc_data_direction);
		return;
	}

	if (!cmd->scmd->request_bufflen)
		return;

	opcode = cmd->frame->hdr.cmd;

	if ((opcode == MFI_CMD_LD_READ) || (opcode == MFI_CMD_LD_WRITE)) {
		if (IS_DMA64)
			buf_h = cmd->frame->io.sgl.sge64[0].phys_addr;
		else
			buf_h = cmd->frame->io.sgl.sge32[0].phys_addr;
	} else {
		if (IS_DMA64)
			buf_h = cmd->frame->pthru.sgl.sge64[0].phys_addr;
		else
			buf_h = cmd->frame->pthru.sgl.sge32[0].phys_addr;
	}

	pci_unmap_single(instance->pdev, buf_h, cmd->scmd->request_bufflen,
			 cmd->scmd->sc_data_direction);
	return;
}

/**
 * megasas_complete_cmd -	Completes a command
 * @instance:			Adapter soft state
 * @cmd:			Command to be completed
 * @alt_status:			If non-zero, use this value as status to 
 * 				SCSI mid-layer instead of the value returned
 * 				by the FW. This should be used if caller wants
 * 				an alternate status (as in the case of aborted
 * 				commands)
 */
static inline void
megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
		     u8 alt_status)
{
	int exception = 0;
	struct megasas_header *hdr = &cmd->frame->hdr;
	unsigned long flags;

	if (cmd->scmd) {
		cmd->scmd->SCp.ptr = (char *)0;
	}

	switch (hdr->cmd) {

	case MFI_CMD_PD_SCSI_IO:
	case MFI_CMD_LD_SCSI_IO:

		/*
		 * MFI_CMD_PD_SCSI_IO and MFI_CMD_LD_SCSI_IO could have been
		 * issued either through an IO path or an IOCTL path. If it
		 * was via IOCTL, we will send it to internal completion.
		 */
		if (cmd->sync_cmd) {
			cmd->sync_cmd = 0;
			megasas_complete_int_cmd(instance, cmd);
			break;
		}

		/*
		 * Don't export physical disk devices to mid-layer.
		 */
		if (!MEGASAS_IS_LOGICAL(cmd->scmd) &&
		    (hdr->cmd_status == MFI_STAT_OK) &&
		    (cmd->scmd->cmnd[0] == INQUIRY)) {

			if (((*(u8 *) cmd->scmd->request_buffer) & 0x1F) ==
			    TYPE_DISK) {
				cmd->scmd->result = DID_BAD_TARGET << 16;
				exception = 1;
			}
		}

	case MFI_CMD_LD_READ:
	case MFI_CMD_LD_WRITE:

		if (alt_status) {
			cmd->scmd->result = alt_status << 16;
			exception = 1;
		}

		if (exception) {

			spin_lock_irqsave(&instance->instance_lock, flags);
			instance->fw_outstanding--;
			spin_unlock_irqrestore(&instance->instance_lock, flags);

			megasas_unmap_sgbuf(instance, cmd);
			cmd->scmd->scsi_done(cmd->scmd);
			megasas_return_cmd(instance, cmd);

			break;
		}

		switch (hdr->cmd_status) {

		case MFI_STAT_OK:
			cmd->scmd->result = DID_OK << 16;
			break;

		case MFI_STAT_SCSI_IO_FAILED:
		case MFI_STAT_LD_INIT_IN_PROGRESS:
			cmd->scmd->result =
			    (DID_ERROR << 16) | hdr->scsi_status;
			break;

		case MFI_STAT_SCSI_DONE_WITH_ERROR:

			cmd->scmd->result = (DID_OK << 16) | hdr->scsi_status;

			if (hdr->scsi_status == SAM_STAT_CHECK_CONDITION) {
				memset(cmd->scmd->sense_buffer, 0,
				       SCSI_SENSE_BUFFERSIZE);
				memcpy(cmd->scmd->sense_buffer, cmd->sense,
				       hdr->sense_len);

				cmd->scmd->result |= DRIVER_SENSE << 24;
			}

			break;

		case MFI_STAT_LD_OFFLINE:
		case MFI_STAT_DEVICE_NOT_FOUND:
			cmd->scmd->result = DID_BAD_TARGET << 16;
			break;

		default:
			printk(KERN_DEBUG "megasas: MFI FW status %#x\n",
			       hdr->cmd_status);
			cmd->scmd->result = DID_ERROR << 16;
			break;
		}

		spin_lock_irqsave(&instance->instance_lock, flags);