ips.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,776 行 · 第 1/5 页

	IPS_PRINTK(KERN_WARNING, ha->pcidev, "Flushing Complete.\n");

	ips_sh[i] = NULL;
	ips_ha[i] = NULL;

	/* free extra memory */
	ips_free(ha);

	/* Free I/O Region */
	if (ha->io_addr)
		release_region(ha->io_addr, ha->io_len);

	/* free IRQ */
	free_irq(ha->irq, ha);

	IPS_REMOVE_HOST(sh);
	scsi_host_put(sh);

	ips_released_controllers++;

	return (FALSE);
}

/****************************************************************************/
/*                                                                          */
/* Routine Name: ips_halt                                                   */
/*                                                                          */
/* Routine Description:                                                     */
/*                                                                          */
/*   Perform cleanup when the system reboots                                */
/*                                                                          */
/****************************************************************************/
static int
ips_halt(struct notifier_block *nb, ulong event, void *buf)
{
	ips_scb_t *scb;
	ips_ha_t *ha;
	int i;

	if ((event != SYS_RESTART) && (event != SYS_HALT) &&
	    (event != SYS_POWER_OFF))
		return (NOTIFY_DONE);

	for (i = 0; i < ips_next_controller; i++) {
		ha = (ips_ha_t *) ips_ha[i];

		if (!ha)
			continue;

		if (!ha->active)
			continue;

		/* flush the cache on the controller */
		scb = &ha->scbs[ha->max_cmds - 1];

		ips_init_scb(ha, scb);

		scb->timeout = ips_cmd_timeout;
		scb->cdb[0] = IPS_CMD_FLUSH;

		scb->cmd.flush_cache.op_code = IPS_CMD_FLUSH;
		scb->cmd.flush_cache.command_id = IPS_COMMAND_ID(ha, scb);
		scb->cmd.flush_cache.state = IPS_NORM_STATE;
		scb->cmd.flush_cache.reserved = 0;
		scb->cmd.flush_cache.reserved2 = 0;
		scb->cmd.flush_cache.reserved3 = 0;
		scb->cmd.flush_cache.reserved4 = 0;

		IPS_PRINTK(KERN_WARNING, ha->pcidev, "Flushing Cache.\n");

		/* send command */
		if (ips_send_wait(ha, scb, ips_cmd_timeout, IPS_INTR_ON) ==
		    IPS_FAILURE)
			IPS_PRINTK(KERN_WARNING, ha->pcidev,
				   "Incomplete Flush.\n");
		else
			IPS_PRINTK(KERN_WARNING, ha->pcidev,
				   "Flushing Complete.\n");
	}

	return (NOTIFY_OK);
}

/****************************************************************************/
/*                                                                          */
/* Routine Name: ips_eh_abort                                               */
/*                                                                          */
/* Routine Description:                                                     */
/*                                                                          */
/*   Abort a command (using the new error code stuff)                       */
/* Note: this routine is called under the io_request_lock                   */
/****************************************************************************/
int
ips_eh_abort(Scsi_Cmnd * SC)
{
	ips_ha_t *ha;
	ips_copp_wait_item_t *item;
	int ret;

	METHOD_TRACE("ips_eh_abort", 1);

	if (!SC)
		return (FAILED);

	ha = (ips_ha_t *) SC->device->host->hostdata;

	if (!ha)
		return (FAILED);

	if (!ha->active)
		return (FAILED);

	if (SC->serial_number != SC->serial_number_at_timeout) {
		/* HMM, looks like a bogus command */
		DEBUG(1, "Abort called with bogus scsi command");

		return (FAILED);
	}

	/* See if the command is on the copp queue */
	item = ha->copp_waitlist.head;
	while ((item) && (item->scsi_cmd != SC))
		item = item->next;

	if (item) {
		/* Found it */
		ips_removeq_copp(&ha->copp_waitlist, item);
		ret = (SUCCESS);

		/* See if the command is on the wait queue */
	} else if (ips_removeq_wait(&ha->scb_waitlist, SC)) {
		/* command not sent yet */
		ret = (SUCCESS);
	} else {
		/* command must have already been sent */
		ret = (FAILED);
	}
	return ret;
}

/****************************************************************************/
/*                                                                          */
/* Routine Name: ips_eh_reset                                               */
/*                                                                          */
/* Routine Description:                                                     */
/*                                                                          */
/*   Reset the controller (with new eh error code)                          */
/*                                                                          */
/* NOTE: this routine is called under the io_request_lock spinlock          */
/*                                                                          */
/****************************************************************************/
int
ips_eh_reset(Scsi_Cmnd * SC)
{
	int ret;
	int i;
	ips_ha_t *ha;
	ips_scb_t *scb;
	ips_copp_wait_item_t *item;

	METHOD_TRACE("ips_eh_reset", 1);

#ifdef NO_IPS_RESET
	return (FAILED);
#else

	if (!SC) {
		DEBUG(1, "Reset called with NULL scsi command");

		return (FAILED);
	}

	ha = (ips_ha_t *) SC->device->host->hostdata;

	if (!ha) {
		DEBUG(1, "Reset called with NULL ha struct");

		return (FAILED);
	}

	if (!ha->active)
		return (FAILED);

	/* See if the command is on the copp queue */
	item = ha->copp_waitlist.head;
	while ((item) && (item->scsi_cmd != SC))
		item = item->next;

	if (item) {
		/* Found it */
		ips_removeq_copp(&ha->copp_waitlist, item);
		return (SUCCESS);
	}

	/* See if the command is on the wait queue */
	if (ips_removeq_wait(&ha->scb_waitlist, SC)) {
		/* command not sent yet */
		return (SUCCESS);
	}

	/* An explanation for the casual observer:                              */
	/* Part of the function of a RAID controller is automatic error         */
	/* detection and recovery.  As such, the only problem that physically   */
	/* resetting an adapter will ever fix is when, for some reason,         */
	/* the driver is not successfully communicating with the adapter.       */
	/* Therefore, we will attempt to flush this adapter.  If that succeeds, */
	/* then there's no real purpose in a physical reset. This will complete */
	/* much faster and avoids any problems that might be caused by a        */
	/* physical reset ( such as having to fail all the outstanding I/O's ). */

	if (ha->ioctl_reset == 0) {	/* IF Not an IOCTL Requested Reset */
		scb = &ha->scbs[ha->max_cmds - 1];

		ips_init_scb(ha, scb);

		scb->timeout = ips_cmd_timeout;
		scb->cdb[0] = IPS_CMD_FLUSH;

		scb->cmd.flush_cache.op_code = IPS_CMD_FLUSH;
		scb->cmd.flush_cache.command_id = IPS_COMMAND_ID(ha, scb);
		scb->cmd.flush_cache.state = IPS_NORM_STATE;
		scb->cmd.flush_cache.reserved = 0;
		scb->cmd.flush_cache.reserved2 = 0;
		scb->cmd.flush_cache.reserved3 = 0;
		scb->cmd.flush_cache.reserved4 = 0;

		/* Attempt the flush command */
		ret = ips_send_wait(ha, scb, ips_cmd_timeout, IPS_INTR_IORL);
		if (ret == IPS_SUCCESS) {
			IPS_PRINTK(KERN_NOTICE, ha->pcidev,
				   "Reset Request - Flushed Cache\n");
			return (SUCCESS);
		}
	}

	/* Either we can't communicate with the adapter or it's an IOCTL request */
	/* from a utility.  A physical reset is needed at this point.            */

	ha->ioctl_reset = 0;	/* Reset the IOCTL Requested Reset Flag */

	/*
	 * command must have already been sent
	 * reset the controller
	 */
	IPS_PRINTK(KERN_NOTICE, ha->pcidev, "Resetting controller.\n");
	ret = (*ha->func.reset) (ha);

	if (!ret) {
		Scsi_Cmnd *scsi_cmd;

		IPS_PRINTK(KERN_NOTICE, ha->pcidev,
			   "Controller reset failed - controller now offline.\n");

		/* Now fail all of the active commands */
		DEBUG_VAR(1, "(%s%d) Failing active commands",
			  ips_name, ha->host_num);

		while ((scb = ips_removeq_scb_head(&ha->scb_activelist))) {
			scb->scsi_cmd->result = DID_ERROR << 16;
			scb->scsi_cmd->scsi_done(scb->scsi_cmd);
			ips_freescb(ha, scb);
		}

		/* Now fail all of the pending commands */
		DEBUG_VAR(1, "(%s%d) Failing pending commands",
			  ips_name, ha->host_num);

		while ((scsi_cmd = ips_removeq_wait_head(&ha->scb_waitlist))) {
			scsi_cmd->result = DID_ERROR;
			scsi_cmd->scsi_done(scsi_cmd);
		}

		ha->active = FALSE;
		return (FAILED);
	}

	if (!ips_clear_adapter(ha, IPS_INTR_IORL)) {
		Scsi_Cmnd *scsi_cmd;

		IPS_PRINTK(KERN_NOTICE, ha->pcidev,
			   "Controller reset failed - controller now offline.\n");

		/* Now fail all of the active commands */
		DEBUG_VAR(1, "(%s%d) Failing active commands",
			  ips_name, ha->host_num);

		while ((scb = ips_removeq_scb_head(&ha->scb_activelist))) {
			scb->scsi_cmd->result = DID_ERROR << 16;
			scb->scsi_cmd->scsi_done(scb->scsi_cmd);
			ips_freescb(ha, scb);
		}

		/* Now fail all of the pending commands */
		DEBUG_VAR(1, "(%s%d) Failing pending commands",
			  ips_name, ha->host_num);

		while ((scsi_cmd = ips_removeq_wait_head(&ha->scb_waitlist))) {
			scsi_cmd->result = DID_ERROR << 16;
			scsi_cmd->scsi_done(scsi_cmd);
		}

		ha->active = FALSE;
		return (FAILED);
	}

	/* FFDC */
	if (le32_to_cpu(ha->subsys->param[3]) & 0x300000) {
		struct timeval tv;

		do_gettimeofday(&tv);
		ha->last_ffdc = tv.tv_sec;
		ha->reset_count++;
		ips_ffdc_reset(ha, IPS_INTR_IORL);
	}

	/* Now fail all of the active commands */
	DEBUG_VAR(1, "(%s%d) Failing active commands", ips_name, ha->host_num);

	while ((scb = ips_removeq_scb_head(&ha->scb_activelist))) {
		scb->scsi_cmd->result =
		    (DID_RESET << 16) | (SUGGEST_RETRY << 24);
		scb->scsi_cmd->scsi_done(scb->scsi_cmd);
		ips_freescb(ha, scb);
	}

	/* Reset DCDB active command bits */
	for (i = 1; i < ha->nbus; i++)
		ha->dcdb_active[i - 1] = 0;

	/* Reset the number of active IOCTLs */
	ha->num_ioctl = 0;

	ips_next(ha, IPS_INTR_IORL);

	return (SUCCESS);
#endif				/* NO_IPS_RESET */

}

/****************************************************************************/
/*                                                                          */
/* Routine Name: ips_queue                                                  */
/*                                                                          */
/* Routine Description:                                                     */
/*                                                                          */
/*   Send a command to the controller                                       */
/*                                                                          */
/* NOTE:                                                                    */
/*    Linux obtains io_request_lock before calling this function            */
/*                                                                          */
/****************************************************************************/
int
ips_queue(Scsi_Cmnd * SC, void (*done) (Scsi_Cmnd *))
{
	ips_ha_t *ha;
	ips_passthru_t *pt;