megaraid_sas.c

最新的Megaraid SAS卡驱动源代码

		if (!outstanding)
			break;

		if (!(i % MEGASAS_RESET_NOTICE_INTERVAL)) {
			printk(KERN_NOTICE "megasas: [%2d]waiting for %d "
			       "commands to complete\n",i,outstanding);
			/*
			 * Call cmd completion routine. Cmd to be 
			 * be completed directly without depending on isr.
			 */
			megasas_complete_cmd_dpc((unsigned long)instance);
		}

		msleep(1000);
	}

	if (atomic_read(&instance->fw_outstanding)) {
		/*
		* Send signal to FW to stop processing any pending cmds.
		* The controller will be taken offline by the OS now.
		*/
		writel(MFI_STOP_ADP,
				&instance->reg_set->inbound_doorbell);
		megasas_dump_pending_frames(instance);
		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 retries=%x\n",
		 scmd->serial_number, scmd->cmnd[0], scmd->retries);

	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;
}

 /**
 * megasas_reset_timer - quiesce the adapter if required
 * @scmd:		scsi cmnd
 *
 * Sets the FW busy flag and reduces the host->can_queue if the
 * cmd has not been completed within the timeout period.
 */
static enum
scsi_eh_timer_return megasas_reset_timer(struct scsi_cmnd *scmd)
{
	struct megasas_cmd *cmd = (struct megasas_cmd *)scmd->SCp.ptr;
	struct megasas_instance *instance;
	unsigned long flags;

	if (time_after(jiffies, scmd->jiffies_at_alloc +
				(MEGASAS_DEFAULT_CMD_TIMEOUT * 2) * HZ)) {
		return EH_NOT_HANDLED;
	}

	instance = cmd->instance;
	if (!(instance->flag & MEGASAS_FW_BUSY)) {
		/* FW is busy, throttle IO */
		spin_lock_irqsave(instance->host->host_lock, flags);

		instance->host->can_queue = 16;
		instance->last_time = jiffies;
		instance->flag |= MEGASAS_FW_BUSY;

		spin_unlock_irqrestore(instance->host->host_lock, flags);
	}
	return EH_RESET_TIMER;
}

/**
 * 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;

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

	return ret;
}

/**
 * megasas_bios_param - Returns disk geometry for a disk
 * @sdev: 		device handle
 * @bdev:		block device
 * @capacity:		drive capacity
 * @geom:		geometry parameters
 */
static int
megasas_bios_param(struct scsi_device *sdev, struct block_device *bdev,
		 sector_t capacity, int geom[])
{
	int heads;
	int sectors;
	sector_t cylinders;
	unsigned long tmp;
	/* Default heads (64) & sectors (32) */
	heads = 64;
	sectors = 32;

	tmp = heads * sectors;
	cylinders = capacity;

	sector_div(cylinders, tmp);

	/*
	 * Handle extended translation size for logical drives > 1Gb
	 */

	if (capacity >= 0x200000) {
		heads = 255;
		sectors = 63;
		tmp = heads*sectors;
		cylinders = capacity;
		sector_div(cylinders, tmp);
	}

	geom[0] = heads;
	geom[1] = sectors;
	geom[2] = cylinders;

	return 0;
}

/**
 * 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);
}

static struct megasas_instance *megasas_lookup_instance(u16 host_no)
{
	int i;

	for (i = 0; i < megasas_mgmt_info.max_index; i++) {

		if ((megasas_mgmt_info.instance[i]) &&
		    (megasas_mgmt_info.instance[i]->host->host_no == host_no))
			return megasas_mgmt_info.instance[i];
	}

	return NULL;
}

static int megasas_slave_alloc(struct scsi_device *sdev) {
	struct megasas_instance *instance ;
	int tmp_fastload = fast_load;
	instance = megasas_lookup_instance(sdev->host->host_no);

	if (tmp_fastload && sdev->channel < MEGASAS_MAX_PD_CHANNELS) {
		if ((sdev->id == MEGASAS_MAX_DEV_PER_CHANNEL -1) &&
			(sdev->channel == MEGASAS_MAX_PD_CHANNELS - 1)) {
			/* If fast load option was set and scan for last device is
			 * over, reset the fast_load flag so that during a possible
			 * next scan, devices can be made available
			 */
			fast_load = 0;
		}
		return -ENXIO;
	}

	return 0;
}

/*
 * 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",
	.slave_configure = megasas_slave_configure,
	.slave_alloc = megasas_slave_alloc,
	.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,
	.bios_param = megasas_bios_param,
	.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 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 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 = NULL;

	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;
		}

	case MFI_CMD_LD_READ:
	case MFI_CMD_LD_WRITE:

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

		if (exception) {

			atomic_dec(&instance->fw_outstanding);

			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;
		}

		atomic_dec(&instance->fw_outstanding);

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

		break;

	case MFI_CMD_SMP:
	case MFI_CMD_STP:
	case MFI_CMD_DCMD:

		/*
		 * See if got an event notification
		 */
		if (cmd->frame->dcmd.opcode == MR_DCMD_CTRL_EVENT_WAIT)
			megasas_service_aen(instance, cmd);
		else
			megasas_complete_int_cmd(instance, cmd);

		break;

	case MFI_CMD_ABORT:
		/*
		 * Cmd issued to abort another cmd returned
		 */
		megasas_complete_abort(instance, cmd);
		break;

	default:
		printk("megasas: Unknown command completed! [0x%X]\n",
		       hdr->cmd);
		break;
	}
	
	/*
	 * Check if we can restore can_queue
	 */
	if (instance->flag & MEGASAS_FW_BUSY
		&& time_after(jiffies, instance->last_time + 5 * HZ)
		&& atomic_read(&instance->fw_outstanding) < 17) {

		spin_lock_irqsave(instance->host->host_lock, flags);
		instance->flag &= ~MEGASAS_FW_BUSY;
		instance->host->can_queue =
				instance->max_fw_cmds - MEGASAS_INT_CMDS;

		spin_unlock_irqrestore(instance->host->host_lock, flags);
	}
	
}

/**
 * megasas_deplete_reply_queue -	Processes all completed commands
 * @instance:				Adapter soft state
 * @alt_status:				Alternate status to be returned to
 * 					SCSI mid-layer instead of the status
 * 					returned by the FW
 */
static int
megasas_deplete_reply_queue(struct megasas_instance *instance, u8 alt_status)
{
	/*
	 * Check if it is our interrupt
	 * Clear the interrupt 
	 */
	if(instance->instancet->clear_intr(instance->reg_set))
		return IRQ_NONE;

	if (instance->hw_crit_error)
		goto out_done;
        /*
	 * Schedule the tasklet for cmd completion
	 */
	tasklet_schedule(&instance->isr_tasklet);
out_done:
	return IRQ_HANDLED;
}

/**
 * megasas_isr - isr entry point
 */