[deliverable/linux.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/delay.h>
#include <linux/dma-mapping.h>
#include <linux/gfp.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
 */
/**
 * rpavscsi_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 rpavscsi_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.
 */
static void rpavscsi_release_crq_queue(struct crq_queue *queue,
				       struct ibmvscsi_host_data *hostdata,
				       int max_requests)
{
	long rc = 0;
	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	free_irq(vdev->irq, (void *)hostdata);
	tasklet_kill(&hostdata->srp_task);
	do {
		if (rc)
			msleep(100);
		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;
}

/**
 * rpavscsi_send_crq: - Send a CRQ
 * @hostdata:	the adapter
 * @word1:	the first 64 bits of the data
 * @word2:	the second 64 bits of the data
 */
static int rpavscsi_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);
}

/**
 * rpavscsi_task: - Process srps asynchronously
 * @data:	ibmvscsi_host_data of host
 */
static void rpavscsi_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 = of_find_node_by_path("/");
	if (!rootdn) {
		return;
	}

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

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

	dev_info(hostdata->dev, "SRP_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;
}

/**
 * reset_crq_queue: - resets a crq after a failure
 * @queue:	crq_queue to initialize and register
 * @hostdata:	ibmvscsi_host_data of host
 *
 */
static int rpavscsi_reset_crq_queue(struct crq_queue *queue,
				    struct ibmvscsi_host_data *hostdata)
{
	int rc = 0;
	struct vio_dev *vdev = to_vio_dev(hostdata->dev);

	/* Close the CRQ */
	do {
		if (rc)
			msleep(100);
		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 */
		dev_warn(hostdata->dev, "Partner adapter not ready\n");
	} else if (rc != 0) {
		dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
	}
	return rc;
}

/**
 * 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.
 */
static int rpavscsi_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(hostdata->dev, 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 = rpavscsi_reset_crq_queue(queue,
					      hostdata);

	if (rc == 2) {
		/* Adapter is good, but other end is not ready */
		dev_warn(hostdata->dev, "Partner adapter not ready\n");
		retrc = 0;
	} else if (rc != 0) {
		dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
		goto reg_crq_failed;
	}

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

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

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

	rc = vio_enable_interrupts(vdev);
	if (rc != 0) {
		dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
		goto req_irq_failed;
	}

	return retrc;

      req_irq_failed:
	tasklet_kill(&hostdata->srp_task);
	rc = 0;
	do {
		if (rc)
			msleep(100);
		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
 *
 */
static int rpavscsi_reenable_crq_queue(struct crq_queue *queue,
				       struct ibmvscsi_host_data *hostdata)
{
	int rc = 0;
	struct vio_dev *vdev = to_vio_dev(hostdata->dev);

	/* Re-enable the CRQ */
	do {
		if (rc)
			msleep(100);
		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)
		dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
	return rc;
}

/**
 * rpavscsi_resume: - resume after suspend
 * @hostdata:	ibmvscsi_host_data of host
 *
 */
static int rpavscsi_resume(struct ibmvscsi_host_data *hostdata)
{
	vio_disable_interrupts(to_vio_dev(hostdata->dev));
	tasklet_schedule(&hostdata->srp_task);
	return 0;
}

struct ibmvscsi_ops rpavscsi_ops = {
	.init_crq_queue = rpavscsi_init_crq_queue,
	.release_crq_queue = rpavscsi_release_crq_queue,
	.reset_crq_queue = rpavscsi_reset_crq_queue,
	.reenable_crq_queue = rpavscsi_reenable_crq_queue,
	.send_crq = rpavscsi_send_crq,
	.resume = rpavscsi_resume,
};
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>
1da177e4 LT	33	#include <asm/hvcall.h>
0f33ece5	34	#include <linux/delay.h>
1da177e4	35	#include <linux/dma-mapping.h>
5a0e3ad6	36	#include <linux/gfp.h>
1da177e4 LT	37	#include <linux/interrupt.h>
1da177e4 LT	38	#include "ibmvscsi.h"
b4687ca4 LX	39
	40	static char partition_name[97] = "UNKNOWN";
	41	static unsigned int partition_number = -1;
1da177e4 LT	42
	43	/* ------------------------------------------------------------
	44	* Routines for managing the command/response queue
	45	*/
	46	/**
d3849d51	47	* rpavscsi_handle_event: - Interrupt handler for crq events
1da177e4 LT	48	* @irq: number of irq to handle, not used
1da177e4 LT	49	* @dev_instance: ibmvscsi_host_data of host that received interrupt
1da177e4 LT	50	*
	51	* Disables interrupts and schedules srp_task
	52	* Always returns IRQ_HANDLED
	53	*/
d3849d51	54	static irqreturn_t rpavscsi_handle_event(int irq, void *dev_instance)
1da177e4 LT	55	{
	56	struct ibmvscsi_host_data *hostdata =
	57	(struct ibmvscsi_host_data *)dev_instance;
	58	vio_disable_interrupts(to_vio_dev(hostdata->dev));
	59	tasklet_schedule(&hostdata->srp_task);
	60	return IRQ_HANDLED;
	61	}
	62
	63	/**
	64	* release_crq_queue: - Deallocates data and unregisters CRQ
	65	* @queue: crq_queue to initialize and register
	66	* @host_data: ibmvscsi_host_data of host
	67	*
	68	* Frees irq, deallocates a page for messages, unmaps dma, and unregisters
	69	* the crq with the hypervisor.
	70	*/
d3849d51 DW	71	static void rpavscsi_release_crq_queue(struct crq_queue *queue,
	72	struct ibmvscsi_host_data *hostdata,
	73	int max_requests)
1da177e4	74	{
0f33ece5	75	long rc = 0;
1da177e4 LT	76	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	77	free_irq(vdev->irq, (void *)hostdata);
	78	tasklet_kill(&hostdata->srp_task);
	79	do {
0f33ece5 BK	80	if (rc)
0f33ece5 BK	81	msleep(100);
1da177e4	82	rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
706c8c93	83	} while ((rc == H_BUSY) \|\| (H_IS_LONG_BUSY(rc)));
1da177e4 LT	84	dma_unmap_single(hostdata->dev,
	85	queue->msg_token,
	86	queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
	87	free_page((unsigned long)queue->msgs);
	88	}
	89
	90	/**
	91	* crq_queue_next_crq: - Returns the next entry in message queue
	92	* @queue: crq_queue to use
	93	*
	94	* Returns pointer to next entry in queue, or NULL if there are no new
	95	* entried in the CRQ.
	96	*/
	97	static struct viosrp_crq crq_queue_next_crq(struct crq_queue queue)
	98	{
	99	struct viosrp_crq *crq;
	100	unsigned long flags;
	101
	102	spin_lock_irqsave(&queue->lock, flags);
	103	crq = &queue->msgs[queue->cur];
	104	if (crq->valid & 0x80) {
	105	if (++queue->cur == queue->size)
	106	queue->cur = 0;
	107	} else
	108	crq = NULL;
	109	spin_unlock_irqrestore(&queue->lock, flags);
	110
	111	return crq;
	112	}
	113
	114	/**
d3849d51	115	* rpavscsi_send_crq: - Send a CRQ
1da177e4 LT	116	* @hostdata: the adapter
	117	* @word1: the first 64 bits of the data
	118	* @word2: the second 64 bits of the data
	119	*/
d3849d51 DW	120	static int rpavscsi_send_crq(struct ibmvscsi_host_data *hostdata,
d3849d51 DW	121	u64 word1, u64 word2)
1da177e4 LT	122	{
	123	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	124
	125	return plpar_hcall_norets(H_SEND_CRQ, vdev->unit_address, word1, word2);
	126	}
	127
	128	/**
d3849d51	129	* rpavscsi_task: - Process srps asynchronously
1da177e4 LT	130	* @data: ibmvscsi_host_data of host
1da177e4 LT	131	*/
d3849d51	132	static void rpavscsi_task(void *data)
1da177e4 LT	133	{
	134	struct ibmvscsi_host_data hostdata = (struct ibmvscsi_host_data )data;
	135	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	136	struct viosrp_crq *crq;
	137	int done = 0;
	138
	139	while (!done) {
	140	/* Pull all the valid messages off the CRQ */
	141	while ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
	142	ibmvscsi_handle_crq(crq, hostdata);
	143	crq->valid = 0x00;
	144	}
	145
	146	vio_enable_interrupts(vdev);
	147	if ((crq = crq_queue_next_crq(&hostdata->queue)) != NULL) {
	148	vio_disable_interrupts(vdev);
	149	ibmvscsi_handle_crq(crq, hostdata);
	150	crq->valid = 0x00;
	151	} else {
	152	done = 1;
	153	}
	154	}
	155	}
	156
b4687ca4 LX	157	static void gather_partition_info(void)
	158	{
	159	struct device_node *rootdn;
	160
294ef16a JK	161	const char *ppartition_name;
294ef16a JK	162	const unsigned int *p_number_ptr;
b4687ca4 LX	163
b4687ca4 LX	164	/* Retrieve information about this partition */
8c8dc322	165	rootdn = of_find_node_by_path("/");
b4687ca4 LX	166	if (!rootdn) {
	167	return;
	168	}
	169
40cd3a45	170	ppartition_name = of_get_property(rootdn, "ibm,partition-name", NULL);
b4687ca4 LX	171	if (ppartition_name)
	172	strncpy(partition_name, ppartition_name,
	173	sizeof(partition_name));
40cd3a45	174	p_number_ptr = of_get_property(rootdn, "ibm,partition-no", NULL);
b4687ca4 LX	175	if (p_number_ptr)
b4687ca4 LX	176	partition_number = *p_number_ptr;
8c8dc322	177	of_node_put(rootdn);
b4687ca4 LX	178	}
	179
	180	static void set_adapter_info(struct ibmvscsi_host_data *hostdata)
	181	{
	182	memset(&hostdata->madapter_info, 0x00,
	183	sizeof(hostdata->madapter_info));
	184
6c0a60ec	185	dev_info(hostdata->dev, "SRP_VERSION: %s\n", SRP_VERSION);
b4687ca4 LX	186	strcpy(hostdata->madapter_info.srp_version, SRP_VERSION);
	187
	188	strncpy(hostdata->madapter_info.partition_name, partition_name,
	189	sizeof(hostdata->madapter_info.partition_name));
	190
	191	hostdata->madapter_info.partition_number = partition_number;
	192
	193	hostdata->madapter_info.mad_version = 1;
	194	hostdata->madapter_info.os_type = 2;
	195	}
	196
d3849d51 DW	197	/**
	198	* reset_crq_queue: - resets a crq after a failure
	199	* @queue: crq_queue to initialize and register
	200	* @hostdata: ibmvscsi_host_data of host
	201	*
	202	*/
	203	static int rpavscsi_reset_crq_queue(struct crq_queue *queue,
	204	struct ibmvscsi_host_data *hostdata)
	205	{
0f33ece5	206	int rc = 0;
d3849d51 DW	207	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	208
	209	/* Close the CRQ */
	210	do {
0f33ece5 BK	211	if (rc)
0f33ece5 BK	212	msleep(100);
d3849d51 DW	213	rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
	214	} while ((rc == H_BUSY) \|\| (H_IS_LONG_BUSY(rc)));
	215
	216	/* Clean out the queue */
	217	memset(queue->msgs, 0x00, PAGE_SIZE);
	218	queue->cur = 0;
	219
	220	set_adapter_info(hostdata);
	221
	222	/* And re-open it again */
	223	rc = plpar_hcall_norets(H_REG_CRQ,
	224	vdev->unit_address,
	225	queue->msg_token, PAGE_SIZE);
	226	if (rc == 2) {
	227	/* Adapter is good, but other end is not ready */
	228	dev_warn(hostdata->dev, "Partner adapter not ready\n");
	229	} else if (rc != 0) {
	230	dev_warn(hostdata->dev, "couldn't register crq--rc 0x%x\n", rc);
	231	}
	232	return rc;
	233	}
	234
1da177e4 LT	235	/**
	236	* initialize_crq_queue: - Initializes and registers CRQ with hypervisor
	237	* @queue: crq_queue to initialize and register
	238	* @hostdata: ibmvscsi_host_data of host
	239	*
	240	* Allocates a page for messages, maps it for dma, and registers
	241	* the crq with the hypervisor.
	242	* Returns zero on success.
	243	*/
d3849d51 DW	244	static int rpavscsi_init_crq_queue(struct crq_queue *queue,
	245	struct ibmvscsi_host_data *hostdata,
	246	int max_requests)
1da177e4 LT	247	{
1da177e4 LT	248	int rc;
cefbda2d	249	int retrc;
1da177e4 LT	250	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	251
	252	queue->msgs = (struct viosrp_crq *)get_zeroed_page(GFP_KERNEL);
	253
	254	if (!queue->msgs)
	255	goto malloc_failed;
	256	queue->size = PAGE_SIZE / sizeof(*queue->msgs);
	257
	258	queue->msg_token = dma_map_single(hostdata->dev, queue->msgs,
	259	queue->size * sizeof(*queue->msgs),
	260	DMA_BIDIRECTIONAL);
	261
8d8bb39b	262	if (dma_mapping_error(hostdata->dev, queue->msg_token))
1da177e4 LT	263	goto map_failed;
1da177e4 LT	264
b4687ca4 LX	265	gather_partition_info();
	266	set_adapter_info(hostdata);
	267
cefbda2d	268	retrc = rc = plpar_hcall_norets(H_REG_CRQ,
1da177e4 LT	269	vdev->unit_address,
1da177e4 LT	270	queue->msg_token, PAGE_SIZE);
706c8c93	271	if (rc == H_RESOURCE)
bb58596f	272	/* maybe kexecing and resource is busy. try a reset */
d3849d51	273	rc = rpavscsi_reset_crq_queue(queue,
bb58596f DB	274	hostdata);
bb58596f DB	275
1da177e4 LT	276	if (rc == 2) {
1da177e4 LT	277	/* Adapter is good, but other end is not ready */
6c0a60ec	278	dev_warn(hostdata->dev, "Partner adapter not ready\n");
ae0fda0c	279	retrc = 0;
1da177e4	280	} else if (rc != 0) {
6c0a60ec	281	dev_warn(hostdata->dev, "Error %d opening adapter\n", rc);
1da177e4 LT	282	goto reg_crq_failed;
	283	}
	284
8f83d768 AB	285	queue->cur = 0;
	286	spin_lock_init(&queue->lock);
	287
	288	tasklet_init(&hostdata->srp_task, (void *)rpavscsi_task,
	289	(unsigned long)hostdata);
	290
1da177e4	291	if (request_irq(vdev->irq,
d3849d51	292	rpavscsi_handle_event,
1da177e4	293	0, "ibmvscsi", (void *)hostdata) != 0) {
6c0a60ec BK	294	dev_err(hostdata->dev, "couldn't register irq 0x%x\n",
6c0a60ec BK	295	vdev->irq);
1da177e4 LT	296	goto req_irq_failed;
	297	}
	298
	299	rc = vio_enable_interrupts(vdev);
	300	if (rc != 0) {
6c0a60ec	301	dev_err(hostdata->dev, "Error %d enabling interrupts!!!\n", rc);
1da177e4 LT	302	goto req_irq_failed;
	303	}
	304
cefbda2d	305	return retrc;
1da177e4 LT	306
1da177e4 LT	307	req_irq_failed:
8f83d768	308	tasklet_kill(&hostdata->srp_task);
0f33ece5	309	rc = 0;
1da177e4	310	do {
0f33ece5 BK	311	if (rc)
0f33ece5 BK	312	msleep(100);
1da177e4	313	rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
706c8c93	314	} while ((rc == H_BUSY) \|\| (H_IS_LONG_BUSY(rc)));
1da177e4 LT	315	reg_crq_failed:
	316	dma_unmap_single(hostdata->dev,
	317	queue->msg_token,
	318	queue->size * sizeof(*queue->msgs), DMA_BIDIRECTIONAL);
	319	map_failed:
	320	free_page((unsigned long)queue->msgs);
	321	malloc_failed:
	322	return -1;
	323	}
	324
2b541f8f DB	325	/**
	326	* reenable_crq_queue: - reenables a crq after
	327	* @queue: crq_queue to initialize and register
	328	* @hostdata: ibmvscsi_host_data of host
	329	*
	330	*/
d3849d51 DW	331	static int rpavscsi_reenable_crq_queue(struct crq_queue *queue,
d3849d51 DW	332	struct ibmvscsi_host_data *hostdata)
2b541f8f	333	{
0f33ece5	334	int rc = 0;
2b541f8f DB	335	struct vio_dev *vdev = to_vio_dev(hostdata->dev);
	336
	337	/* Re-enable the CRQ */
	338	do {
0f33ece5 BK	339	if (rc)
0f33ece5 BK	340	msleep(100);
2b541f8f	341	rc = plpar_hcall_norets(H_ENABLE_CRQ, vdev->unit_address);
706c8c93	342	} while ((rc == H_IN_PROGRESS) \|\| (rc == H_BUSY) \|\| (H_IS_LONG_BUSY(rc)));
2b541f8f DB	343
2b541f8f DB	344	if (rc)
6c0a60ec	345	dev_err(hostdata->dev, "Error %d enabling adapter\n", rc);
2b541f8f DB	346	return rc;
	347	}
	348
64355b92 BK	349	/**
	350	* rpavscsi_resume: - resume after suspend
	351	* @hostdata: ibmvscsi_host_data of host
	352	*
	353	*/
	354	static int rpavscsi_resume(struct ibmvscsi_host_data *hostdata)
	355	{
	356	vio_disable_interrupts(to_vio_dev(hostdata->dev));
	357	tasklet_schedule(&hostdata->srp_task);
	358	return 0;
	359	}
	360
d3849d51 DW	361	struct ibmvscsi_ops rpavscsi_ops = {
	362	.init_crq_queue = rpavscsi_init_crq_queue,
	363	.release_crq_queue = rpavscsi_release_crq_queue,
	364	.reset_crq_queue = rpavscsi_reset_crq_queue,
	365	.reenable_crq_queue = rpavscsi_reenable_crq_queue,
	366	.send_crq = rpavscsi_send_crq,
64355b92	367	.resume = rpavscsi_resume,
d3849d51	368	};