You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
312 lines
8.6 KiB
312 lines
8.6 KiB
/* ------------------------------------------------------------
|
|
* 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"
|
|
#include "srp.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
|
|
* @regs: pt_regs with registers
|
|
*
|
|
* Disables interrupts and schedules srp_task
|
|
* Always returns IRQ_HANDLED
|
|
*/
|
|
static irqreturn_t ibmvscsi_handle_event(int irq,
|
|
void *dev_instance,
|
|
struct pt_regs *regs)
|
|
{
|
|
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_isLongBusy(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;
|
|
|
|
char *ppartition_name;
|
|
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 =
|
|
(unsigned int *)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;
|
|
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);
|
|
|
|
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: 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 0;
|
|
|
|
req_irq_failed:
|
|
do {
|
|
rc = plpar_hcall_norets(H_FREE_CRQ, vdev->unit_address);
|
|
} while ((rc == H_Busy) || (H_isLongBusy(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;
|
|
}
|
|
|
|
/**
|
|
* reset_crq_queue: - resets a crq after a failure
|
|
* @queue: crq_queue to initialize and register
|
|
* @hostdata: ibmvscsi_host_data of host
|
|
*
|
|
*/
|
|
void 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_isLongBusy(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);
|
|
}
|
|
}
|
|
|