[mirror_ubuntu-artful-kernel.git] / drivers / scsi / ibmvscsi / rpa_vscsi.c

/* ------------------------------------------------------------
 * rpa_vscsi.c
 * (C) Copyright IBM Corporation 1994, 2003
 * Authors: Colin DeVilbiss (devilbis@us.ibm.com)
 *          Santiago Leon (santil@us.ibm.com)
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 * USA
 *
 * ------------------------------------------------------------
 * RPA-specific functions of the SCSI host adapter for Virtual I/O devices
 *
 * This driver allows the Linux SCSI peripheral drivers to directly
 * access devices in the hosting partition, either on an iSeries
 * hypervisor system or a converged hypervisor system.
 */

#include <asm/vio.h>
#include <asm/prom.h>
#include <asm/iommu.h>
#include <asm/hvcall.h>
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include "ibmvscsi.h"

static char partition_name[97] = "UNKNOWN";
static unsigned int partition_number = -1;

/* ------------------------------------------------------------
 * Routines for managing the command/response queue
 */
/**
 * ibmvscsi_handle_event: - Interrupt handler for crq events
 * @irq:	number of irq to handle, not used
 * @dev_instance: ibmvscsi_host_data of host that received interrupt
 *
 * Disables interrupts and schedules srp_task
 * Always returns IRQ_HANDLED
 */
static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)
{
	struct ibmvscsi_host_data *hostdata =
	    (struct ibmvscsi_host_data *)dev_instance;
	vio_disable_interrupts(to_vio_dev(hostdata->dev));
	tasklet_schedule(&hostdata->srp_task);
	return IRQ_HANDLED;
}

/**
 * release_crq_queue: - Deallocates data and unregisters CRQ
 * @queue:	crq_queue to initialize and register
 * @host_data:	ibmvscsi_host_data of host
 *
 * Frees irq, deallocates a page for messages, unmaps dma, and unregisters
 * the crq with the hypervisor.
 */
void ibmvscsi_release_crq_queue(struct crq_queue *queue,
				struct ibmvscsi_host_data *hostdata,
				int max_requests)
{
	long rc;
	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	free_irq(vdev->irq, (void *)hostdata);
	tasklet_kill(&hostdata->srp_task);
	do {
		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	} while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
	dma_unmap_single(hostdata->dev,
			 queue->msg_token,
			 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
	free_page((unsigned long)queue->msgs);
}

/**
 * crq_queue_next_crq: - Returns the next entry in message queue
 * @queue:	crq_queue to use
 *
 * Returns pointer to next entry in queue, or NULL if there are no new 
 * entried in the CRQ.
 */
static struct viosrp_crq *crq_queue_next_crq(struct crq_queue *queue)
{
	struct viosrp_crq *crq;
	unsigned long flags;

	spin_lock_irqsave(&queue->lock, flags);
	crq = &queue->msgs[queue->cur];
	if (crq->valid & 0x80) {
		if (++queue->cur == queue->size)
			queue->cur = 0;
	} else
		crq = NULL;
	spin_unlock_irqrestore(&queue->lock, flags);

	return crq;
}

/**
 * ibmvscsi_send_crq: - Send a CRQ
 * @hostdata:	the adapter
 * @word1:	the first 64 bits of the data
 * @word2:	the second 64 bits of the data
 */
int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2)
{
	struct vio_dev *vdev = to_vio_dev(hostdata->dev);

	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
}

/**
 * ibmvscsi_task: - Process srps asynchronously
 * @data:	ibmvscsi_host_data of host
 */
static void ibmvscsi_task(void *data)
{
	struct ibmvscsi_host_data *hostdata = (struct ibmvscsi_host_data *)data;
	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	struct viosrp_crq *crq;
	int done = 0;

	while (!done) {
		/* Pull all the valid messages off the CRQ */
		while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
			ibmvscsi_handle_crq(crq, hostdata);
			crq->valid = 0x00;
		}

		vio_enable_interrupts(vdev);
		if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
			vio_disable_interrupts(vdev);
			ibmvscsi_handle_crq(crq, hostdata);
			crq->valid = 0x00;
		} else {
			done = 1;
		}
	}
}

static void gather_partition_info(void)
{
	struct device_node *rootdn;

	const char *ppartition_name;
	const unsigned int *p_number_ptr;

	/* Retrieve information about this partition */
	rootdn = find_path_device("/");
	if (!rootdn) {
		return;
	}

	ppartition_name = get_property(rootdn, "ibm,partition-name", NULL);
	if (ppartition_name)
		strncpy(partition_name, ppartition_name,
				sizeof(partition_name));
	p_number_ptr = get_property(rootdn, "ibm,partition-no", NULL);
	if (p_number_ptr)
		partition_number = *p_number_ptr;
}

static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
{
	memset(&hostdata->madapter_info, 0x00,
			sizeof(hostdata->madapter_info));

	printk(KERN_INFO "rpa_vscsi: SPR_VERSION: %s\n", SRP_VERSION);
	strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);

	strncpy(hostdata->madapter_info.partition_name, partition_name,
			sizeof(hostdata->madapter_info.partition_name));

	hostdata->madapter_info.partition_number = partition_number;

	hostdata->madapter_info.mad_version = 1;
	hostdata->madapter_info.os_type = 2;
}

/**
 * initialize_crq_queue: - Initializes and registers CRQ with hypervisor
 * @queue:	crq_queue to initialize and register
 * @hostdata:	ibmvscsi_host_data of host
 *
 * Allocates a page for messages, maps it for dma, and registers
 * the crq with the hypervisor.
 * Returns zero on success.
 */
int ibmvscsi_init_crq_queue(struct crq_queue *queue,
			    struct ibmvscsi_host_data *hostdata,
			    int max_requests)
{
	int rc;
	int retrc;
	struct vio_dev *vdev = to_vio_dev(hostdata->dev);

	queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);

	if (!queue->msgs)
		goto malloc_failed;
	queue->size = PAGE_SIZE / sizeof(*queue->msgs);

	queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
					  queue->size * sizeof(*queue->msgs),
					  DMA_BIDIRECTIONAL);

	if (dma_mapping_error(queue->msg_token))
		goto map_failed;

	gather_partition_info();
	set_adapter_info(hostdata);

	retrc = rc = plpar_hcall_norets(H_REG_CRQ,
				vdev->unit_address,
				queue->msg_token, PAGE_SIZE);
	if (rc == H_RESOURCE)
		/* maybe kexecing and resource is busy. try a reset */
		rc = ibmvscsi_reset_crq_queue(queue,
					      hostdata);

	if (rc == 2) {
		/* Adapter is good, but other end is not ready */
		printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n");
		retrc = 0;
	} else if (rc != 0) {
		printk(KERN_WARNING "ibmvscsi: Error %d opening adapter\n", rc);
		goto reg_crq_failed;
	}

	if (request_irq(vdev->irq,
			ibmvscsi_handle_event,
			0, "ibmvscsi", (void *)hostdata) != 0) {
		printk(KERN_ERR "ibmvscsi: couldn't register irq 0x%x\n",
		       vdev->irq);
		goto req_irq_failed;
	}

	rc = vio_enable_interrupts(vdev);
	if (rc != 0) {
		printk(KERN_ERR "ibmvscsi:  Error %d enabling interrupts!!!\n",
		       rc);
		goto req_irq_failed;
	}

	queue->cur = 0;
	spin_lock_init(&queue->lock);

	tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
		     (unsigned long)hostdata);

	return retrc;

      req_irq_failed:
	do {
		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	} while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));
      reg_crq_failed:
	dma_unmap_single(hostdata->dev,
			 queue->msg_token,
			 queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
      map_failed:
	free_page((unsigned long)queue->msgs);
      malloc_failed:
	return -1;
}

/**
 * reenable_crq_queue: - reenables a crq after
 * @queue:	crq_queue to initialize and register
 * @hostdata:	ibmvscsi_host_data of host
 *
 */
int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
				 struct ibmvscsi_host_data *hostdata)
{
	int rc;
	struct vio_dev *vdev = to_vio_dev(hostdata->dev);

	/* Re-enable the CRQ */
	do {
		rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
	} while ((rc == H_IN_PROGRESS) || (rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));

	if (rc)
		printk(KERN_ERR "ibmvscsi: Error %d enabling adapter\n", rc);
	return rc;
}

/**
 * reset_crq_queue: - resets a crq after a failure
 * @queue:	crq_queue to initialize and register
 * @hostdata:	ibmvscsi_host_data of host
 *
 */
int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
			      struct ibmvscsi_host_data *hostdata)
{
	int rc;
	struct vio_dev *vdev = to_vio_dev(hostdata->dev);

	/* Close the CRQ */
	do {
		rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	} while ((rc == H_BUSY) || (H_IS_LONG_BUSY(rc)));

	/* Clean out the queue */
	memset(queue->msgs, 0x00, PAGE_SIZE);
	queue->cur = 0;

	set_adapter_info(hostdata);

	/* And re-open it again */
	rc = plpar_hcall_norets(H_REG_CRQ,
				vdev->unit_address,
				queue->msg_token, PAGE_SIZE);
	if (rc == 2) {
		/* Adapter is good, but other end is not ready */
		printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n");
	} else if (rc != 0) {
		printk(KERN_WARNING
		       "ibmvscsi: couldn't register crq--rc 0x%x\n", rc);
	}
	return rc;
}
Commit	Line	Data
1da177e4 LT	1	/* ------------------------------------------------------------
	2	* rpa_vscsi.c
	3	* (C) Copyright IBM Corporation 1994, 2003
	4	* Authors: Colin DeVilbiss (devilbis@us.ibm.com)
	5	* Santiago Leon (santil@us.ibm.com)
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
	20	* USA
	21	*
	22	* ------------------------------------------------------------
	23	* RPA-specific functions of the SCSI host adapter for Virtual I/O devices
	24	*
	25	* This driver allows the Linux SCSI peripheral drivers to directly
	26	* access devices in the hosting partition, either on an iSeries
	27	* hypervisor system or a converged hypervisor system.
	28	*/
	29
	30	#include <asm/vio.h>
71d276d7	31	#include <asm/prom.h>
1da177e4 LT	32	#include <asm/iommu.h>
	33	#include <asm/hvcall.h>
	34	#include <linux/dma-mapping.h>
	35	#include <linux/interrupt.h>
	36	#include "ibmvscsi.h"
b4687ca4 LX	37
	38	static char partition_name[97] = "UNKNOWN";
	39	static unsigned int partition_number = -1;
1da177e4 LT	40
	41	/* ------------------------------------------------------------
	42	* Routines for managing the command/response queue
	43	*/
	44	/**
	45	* ibmvscsi_handle_event: - Interrupt handler for crq events
	46	* @irq: number of irq to handle, not used
	47	* @dev_instance: ibmvscsi_host_data of host that received interrupt
1da177e4 LT	48	*
	49	* Disables interrupts and schedules srp_task
	50	* Always returns IRQ_HANDLED
	51	*/
7d12e780	52	static irqreturn_t ibmvscsi_handle_event(int irq, void *dev_instance)
1da177e4 LT	53	{
	54	struct ibmvscsi_host_data *hostdata =
	55	(struct ibmvscsi_host_data *)dev_instance;
	56	vio_disable_interrupts(to_vio_dev(hostdata->dev));
	57	tasklet_schedule(&hostdata->srp_task);
	58	return IRQ_HANDLED;
	59	}
	60
	61	/**
	62	* release_crq_queue: - Deallocates data and unregisters CRQ
	63	* @queue: crq_queue to initialize and register
	64	* @host_data: ibmvscsi_host_data of host
	65	*
	66	* Frees irq, deallocates a page for messages, unmaps dma, and unregisters
	67	* the crq with the hypervisor.
	68	*/
	69	void ibmvscsi_release_crq_queue(struct crq_queue *queue,
	70	struct ibmvscsi_host_data *hostdata,
	71	int max_requests)
	72	{
	73	long rc;
	74	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	75	free_irq(vdev->irq, (void *)hostdata);
	76	tasklet_kill(&hostdata->srp_task);
	77	do {
	78	rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
706c8c93	79	} while ((rc == H_BUSY) \|\| (H_IS_LONG_BUSY(rc)));
1da177e4 LT	80	dma_unmap_single(hostdata->dev,
	81	queue->msg_token,
	82	queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
	83	free_page((unsigned long)queue->msgs);
	84	}
	85
	86	/**
	87	* crq_queue_next_crq: - Returns the next entry in message queue
	88	* @queue: crq_queue to use
	89	*
	90	* Returns pointer to next entry in queue, or NULL if there are no new
	91	* entried in the CRQ.
	92	*/
	93	static struct viosrp_crq crq_queue_next_crq(struct crq_queue queue)
	94	{
	95	struct viosrp_crq *crq;
	96	unsigned long flags;
	97
	98	spin_lock_irqsave(&queue->lock, flags);
	99	crq = &queue->msgs[queue->cur];
	100	if (crq->valid & 0x80) {
	101	if (++queue->cur == queue->size)
	102	queue->cur = 0;
	103	} else
	104	crq = NULL;
	105	spin_unlock_irqrestore(&queue->lock, flags);
	106
	107	return crq;
	108	}
	109
	110	/**
	111	* ibmvscsi_send_crq: - Send a CRQ
	112	* @hostdata: the adapter
	113	* @word1: the first 64 bits of the data
	114	* @word2: the second 64 bits of the data
	115	*/
	116	int ibmvscsi_send_crq(struct ibmvscsi_host_data *hostdata, u64 word1, u64 word2)
	117	{
	118	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	119
	120	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
	121	}
	122
	123	/**
	124	* ibmvscsi_task: - Process srps asynchronously
	125	* @data: ibmvscsi_host_data of host
	126	*/
	127	static void ibmvscsi_task(void *data)
	128	{
	129	struct ibmvscsi_host_data hostdata = (struct ibmvscsi_host_data )data;
	130	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	131	struct viosrp_crq *crq;
	132	int done = 0;
	133
	134	while (!done) {
	135	/* Pull all the valid messages off the CRQ */
	136	while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
	137	ibmvscsi_handle_crq(crq, hostdata);
	138	crq->valid = 0x00;
	139	}
	140
	141	vio_enable_interrupts(vdev);
	142	if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
	143	vio_disable_interrupts(vdev);
144	ibmvscsi_handle_crq(crq, hostdata);
145	crq->valid = 0x00;
146	} else {
147	done = 1;
148	}
149	}
150	}
151
b4687ca4 LX	152	static void gather_partition_info(void)
	153	{
	154	struct device_node *rootdn;
	155
294ef16a JK	156	const char *ppartition_name;
294ef16a JK	157	const unsigned int *p_number_ptr;
b4687ca4 LX	158
	159	/* Retrieve information about this partition */
	160	rootdn = find_path_device("/");
	161	if (!rootdn) {
	162	return;
	163	}
	164
294ef16a	165	ppartition_name = get_property(rootdn, "ibm,partition-name", NULL);
b4687ca4 LX	166	if (ppartition_name)
	167	strncpy(partition_name, ppartition_name,
	168	sizeof(partition_name));
294ef16a	169	p_number_ptr = get_property(rootdn, "ibm,partition-no", NULL);
b4687ca4 LX	170	if (p_number_ptr)
	171	partition_number = *p_number_ptr;
	172	}
	173
	174	static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
	175	{
	176	memset(&hostdata->madapter_info, 0x00,
	177	sizeof(hostdata->madapter_info));
	178
	179	printk(KERN_INFO "rpa_vscsi: SPR_VERSION: %s\n", SRP_VERSION);
	180	strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
	181
	182	strncpy(hostdata->madapter_info.partition_name, partition_name,
	183	sizeof(hostdata->madapter_info.partition_name));
	184
	185	hostdata->madapter_info.partition_number = partition_number;
	186
	187	hostdata->madapter_info.mad_version = 1;
	188	hostdata->madapter_info.os_type = 2;
	189	}
	190
1da177e4 LT	191	/**
	192	* initialize_crq_queue: - Initializes and registers CRQ with hypervisor
	193	* @queue: crq_queue to initialize and register
	194	* @hostdata: ibmvscsi_host_data of host
	195	*
	196	* Allocates a page for messages, maps it for dma, and registers
	197	* the crq with the hypervisor.
	198	* Returns zero on success.
	199	*/
	200	int ibmvscsi_init_crq_queue(struct crq_queue *queue,
	201	struct ibmvscsi_host_data *hostdata,
	202	int max_requests)
	203	{
	204	int rc;
cefbda2d	205	int retrc;
1da177e4 LT	206	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	207
	208	queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
	209
	210	if (!queue->msgs)
	211	goto malloc_failed;
	212	queue->size = PAGE_SIZE / sizeof(*queue->msgs);
	213
	214	queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
	215	queue->size * sizeof(*queue->msgs),
	216	DMA_BIDIRECTIONAL);
	217
	218	if (dma_mapping_error(queue->msg_token))
	219	goto map_failed;
	220
b4687ca4 LX	221	gather_partition_info();
	222	set_adapter_info(hostdata);
	223
cefbda2d	224	retrc = rc = plpar_hcall_norets(H_REG_CRQ,
1da177e4 LT	225	vdev->unit_address,
1da177e4 LT	226	queue->msg_token, PAGE_SIZE);
706c8c93	227	if (rc == H_RESOURCE)
bb58596f DB	228	/* maybe kexecing and resource is busy. try a reset */
	229	rc = ibmvscsi_reset_crq_queue(queue,
	230	hostdata);
	231
1da177e4 LT	232	if (rc == 2) {
	233	/* Adapter is good, but other end is not ready */
	234	printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n");
ae0fda0c	235	retrc = 0;
1da177e4 LT	236	} else if (rc != 0) {
	237	printk(KERN_WARNING "ibmvscsi: Error %d opening adapter\n", rc);
	238	goto reg_crq_failed;
	239	}
	240
	241	if (request_irq(vdev->irq,
	242	ibmvscsi_handle_event,
	243	0, "ibmvscsi", (void *)hostdata) != 0) {
	244	printk(KERN_ERR "ibmvscsi: couldn't register irq 0x%x\n",
	245	vdev->irq);
	246	goto req_irq_failed;
	247	}
	248
	249	rc = vio_enable_interrupts(vdev);
	250	if (rc != 0) {
	251	printk(KERN_ERR "ibmvscsi: Error %d enabling interrupts!!!\n",
	252	rc);
	253	goto req_irq_failed;
	254	}
	255
	256	queue->cur = 0;
	257	spin_lock_init(&queue->lock);
	258
	259	tasklet_init(&hostdata->srp_task, (void *)ibmvscsi_task,
	260	(unsigned long)hostdata);
	261
cefbda2d	262	return retrc;
1da177e4 LT	263
	264	req_irq_failed:
	265	do {
	266	rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
706c8c93	267	} while ((rc == H_BUSY) \|\| (H_IS_LONG_BUSY(rc)));
1da177e4 LT	268	reg_crq_failed:
	269	dma_unmap_single(hostdata->dev,
	270	queue->msg_token,
	271	queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
	272	map_failed:
	273	free_page((unsigned long)queue->msgs);
	274	malloc_failed:
	275	return -1;
	276	}
	277
2b541f8f DB	278	/**
	279	* reenable_crq_queue: - reenables a crq after
	280	* @queue: crq_queue to initialize and register
	281	* @hostdata: ibmvscsi_host_data of host
	282	*
	283	*/
	284	int ibmvscsi_reenable_crq_queue(struct crq_queue *queue,
	285	struct ibmvscsi_host_data *hostdata)
	286	{
	287	int rc;
	288	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	289
	290	/* Re-enable the CRQ */
	291	do {
	292	rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
706c8c93	293	} while ((rc == H_IN_PROGRESS) \|\| (rc == H_BUSY) \|\| (H_IS_LONG_BUSY(rc)));
2b541f8f DB	294
	295	if (rc)
	296	printk(KERN_ERR "ibmvscsi: Error %d enabling adapter\n", rc);
	297	return rc;
	298	}
	299
1da177e4 LT	300	/**
	301	* reset_crq_queue: - resets a crq after a failure
	302	* @queue: crq_queue to initialize and register
	303	* @hostdata: ibmvscsi_host_data of host
	304	*
	305	*/
bb58596f	306	int ibmvscsi_reset_crq_queue(struct crq_queue *queue,
1da177e4 LT	307	struct ibmvscsi_host_data *hostdata)
	308	{
	309	int rc;
	310	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	311
	312	/* Close the CRQ */
	313	do {
	314	rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
706c8c93	315	} while ((rc == H_BUSY) \|\| (H_IS_LONG_BUSY(rc)));
1da177e4 LT	316
	317	/* Clean out the queue */
	318	memset(queue->msgs, 0x00, PAGE_SIZE);
	319	queue->cur = 0;
	320
b4687ca4 LX	321	set_adapter_info(hostdata);
b4687ca4 LX	322
1da177e4 LT	323	/* And re-open it again */
	324	rc = plpar_hcall_norets(H_REG_CRQ,
	325	vdev->unit_address,
	326	queue->msg_token, PAGE_SIZE);
	327	if (rc == 2) {
	328	/* Adapter is good, but other end is not ready */
	329	printk(KERN_WARNING "ibmvscsi: Partner adapter not ready\n");
	330	} else if (rc != 0) {
	331	printk(KERN_WARNING
	332	"ibmvscsi: couldn't register crq--rc 0x%x\n", rc);
	333	}
bb58596f	334	return rc;
1da177e4	335	}