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OpenCloudOS-Kernel/drivers/scsi/fnic/fnic_isr.c

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/*
* Copyright 2008 Cisco Systems, Inc. All rights reserved.
* Copyright 2007 Nuova Systems, Inc. All rights reserved.
*
* This program is free software; you may redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <scsi/libfc.h>
#include <scsi/fc_frame.h>
#include "vnic_dev.h"
#include "vnic_intr.h"
#include "vnic_stats.h"
#include "fnic_io.h"
#include "fnic.h"
static irqreturn_t fnic_isr_legacy(int irq, void *data)
{
struct fnic *fnic = data;
u32 pba;
unsigned long work_done = 0;
pba = vnic_intr_legacy_pba(fnic->legacy_pba);
if (!pba)
return IRQ_NONE;
if (pba & (1 << FNIC_INTX_NOTIFY)) {
vnic_intr_return_all_credits(&fnic->intr[FNIC_INTX_NOTIFY]);
fnic_handle_link_event(fnic);
}
if (pba & (1 << FNIC_INTX_ERR)) {
vnic_intr_return_all_credits(&fnic->intr[FNIC_INTX_ERR]);
fnic_log_q_error(fnic);
}
if (pba & (1 << FNIC_INTX_WQ_RQ_COPYWQ)) {
work_done += fnic_wq_copy_cmpl_handler(fnic, 8);
work_done += fnic_wq_cmpl_handler(fnic, 4);
work_done += fnic_rq_cmpl_handler(fnic, 4);
vnic_intr_return_credits(&fnic->intr[FNIC_INTX_WQ_RQ_COPYWQ],
work_done,
1 /* unmask intr */,
1 /* reset intr timer */);
}
return IRQ_HANDLED;
}
static irqreturn_t fnic_isr_msi(int irq, void *data)
{
struct fnic *fnic = data;
unsigned long work_done = 0;
work_done += fnic_wq_copy_cmpl_handler(fnic, 8);
work_done += fnic_wq_cmpl_handler(fnic, 4);
work_done += fnic_rq_cmpl_handler(fnic, 4);
vnic_intr_return_credits(&fnic->intr[0],
work_done,
1 /* unmask intr */,
1 /* reset intr timer */);
return IRQ_HANDLED;
}
static irqreturn_t fnic_isr_msix_rq(int irq, void *data)
{
struct fnic *fnic = data;
unsigned long rq_work_done = 0;
rq_work_done = fnic_rq_cmpl_handler(fnic, 4);
vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_RQ],
rq_work_done,
1 /* unmask intr */,
1 /* reset intr timer */);
return IRQ_HANDLED;
}
static irqreturn_t fnic_isr_msix_wq(int irq, void *data)
{
struct fnic *fnic = data;
unsigned long wq_work_done = 0;
wq_work_done = fnic_wq_cmpl_handler(fnic, 4);
vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_WQ],
wq_work_done,
1 /* unmask intr */,
1 /* reset intr timer */);
return IRQ_HANDLED;
}
static irqreturn_t fnic_isr_msix_wq_copy(int irq, void *data)
{
struct fnic *fnic = data;
unsigned long wq_copy_work_done = 0;
wq_copy_work_done = fnic_wq_copy_cmpl_handler(fnic, 8);
vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_WQ_COPY],
wq_copy_work_done,
1 /* unmask intr */,
1 /* reset intr timer */);
return IRQ_HANDLED;
}
static irqreturn_t fnic_isr_msix_err_notify(int irq, void *data)
{
struct fnic *fnic = data;
vnic_intr_return_all_credits(&fnic->intr[FNIC_MSIX_ERR_NOTIFY]);
fnic_log_q_error(fnic);
fnic_handle_link_event(fnic);
return IRQ_HANDLED;
}
void fnic_free_intr(struct fnic *fnic)
{
int i;
switch (vnic_dev_get_intr_mode(fnic->vdev)) {
case VNIC_DEV_INTR_MODE_INTX:
case VNIC_DEV_INTR_MODE_MSI:
free_irq(fnic->pdev->irq, fnic);
break;
case VNIC_DEV_INTR_MODE_MSIX:
for (i = 0; i < ARRAY_SIZE(fnic->msix); i++)
if (fnic->msix[i].requested)
free_irq(fnic->msix_entry[i].vector,
fnic->msix[i].devid);
break;
default:
break;
}
}
int fnic_request_intr(struct fnic *fnic)
{
int err = 0;
int i;
switch (vnic_dev_get_intr_mode(fnic->vdev)) {
case VNIC_DEV_INTR_MODE_INTX:
err = request_irq(fnic->pdev->irq, &fnic_isr_legacy,
IRQF_SHARED, DRV_NAME, fnic);
break;
case VNIC_DEV_INTR_MODE_MSI:
err = request_irq(fnic->pdev->irq, &fnic_isr_msi,
0, fnic->name, fnic);
break;
case VNIC_DEV_INTR_MODE_MSIX:
sprintf(fnic->msix[FNIC_MSIX_RQ].devname,
"%.11s-fcs-rq", fnic->name);
fnic->msix[FNIC_MSIX_RQ].isr = fnic_isr_msix_rq;
fnic->msix[FNIC_MSIX_RQ].devid = fnic;
sprintf(fnic->msix[FNIC_MSIX_WQ].devname,
"%.11s-fcs-wq", fnic->name);
fnic->msix[FNIC_MSIX_WQ].isr = fnic_isr_msix_wq;
fnic->msix[FNIC_MSIX_WQ].devid = fnic;
sprintf(fnic->msix[FNIC_MSIX_WQ_COPY].devname,
"%.11s-scsi-wq", fnic->name);
fnic->msix[FNIC_MSIX_WQ_COPY].isr = fnic_isr_msix_wq_copy;
fnic->msix[FNIC_MSIX_WQ_COPY].devid = fnic;
sprintf(fnic->msix[FNIC_MSIX_ERR_NOTIFY].devname,
"%.11s-err-notify", fnic->name);
fnic->msix[FNIC_MSIX_ERR_NOTIFY].isr =
fnic_isr_msix_err_notify;
fnic->msix[FNIC_MSIX_ERR_NOTIFY].devid = fnic;
for (i = 0; i < ARRAY_SIZE(fnic->msix); i++) {
err = request_irq(fnic->msix_entry[i].vector,
fnic->msix[i].isr, 0,
fnic->msix[i].devname,
fnic->msix[i].devid);
if (err) {
shost_printk(KERN_ERR, fnic->lport->host,
"MSIX: request_irq"
" failed %d\n", err);
fnic_free_intr(fnic);
break;
}
fnic->msix[i].requested = 1;
}
break;
default:
break;
}
return err;
}
int fnic_set_intr_mode(struct fnic *fnic)
{
unsigned int n = ARRAY_SIZE(fnic->rq);
unsigned int m = ARRAY_SIZE(fnic->wq);
unsigned int o = ARRAY_SIZE(fnic->wq_copy);
unsigned int i;
/*
* Set interrupt mode (INTx, MSI, MSI-X) depending
* system capabilities.
*
* Try MSI-X first
*
* We need n RQs, m WQs, o Copy WQs, n+m+o CQs, and n+m+o+1 INTRs
* (last INTR is used for WQ/RQ errors and notification area)
*/
BUG_ON(ARRAY_SIZE(fnic->msix_entry) < n + m + o + 1);
for (i = 0; i < n + m + o + 1; i++)
fnic->msix_entry[i].entry = i;
if (fnic->rq_count >= n &&
fnic->raw_wq_count >= m &&
fnic->wq_copy_count >= o &&
fnic->cq_count >= n + m + o) {
if (!pci_enable_msix(fnic->pdev, fnic->msix_entry,
n + m + o + 1)) {
fnic->rq_count = n;
fnic->raw_wq_count = m;
fnic->wq_copy_count = o;
fnic->wq_count = m + o;
fnic->cq_count = n + m + o;
fnic->intr_count = n + m + o + 1;
fnic->err_intr_offset = FNIC_MSIX_ERR_NOTIFY;
FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
"Using MSI-X Interrupts\n");
vnic_dev_set_intr_mode(fnic->vdev,
VNIC_DEV_INTR_MODE_MSIX);
return 0;
}
}
/*
* Next try MSI
* We need 1 RQ, 1 WQ, 1 WQ_COPY, 3 CQs, and 1 INTR
*/
if (fnic->rq_count >= 1 &&
fnic->raw_wq_count >= 1 &&
fnic->wq_copy_count >= 1 &&
fnic->cq_count >= 3 &&
fnic->intr_count >= 1 &&
!pci_enable_msi(fnic->pdev)) {
fnic->rq_count = 1;
fnic->raw_wq_count = 1;
fnic->wq_copy_count = 1;
fnic->wq_count = 2;
fnic->cq_count = 3;
fnic->intr_count = 1;
fnic->err_intr_offset = 0;
FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
"Using MSI Interrupts\n");
vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_MSI);
return 0;
}
/*
* Next try INTx
* We need 1 RQ, 1 WQ, 1 WQ_COPY, 3 CQs, and 3 INTRs
* 1 INTR is used for all 3 queues, 1 INTR for queue errors
* 1 INTR for notification area
*/
if (fnic->rq_count >= 1 &&
fnic->raw_wq_count >= 1 &&
fnic->wq_copy_count >= 1 &&
fnic->cq_count >= 3 &&
fnic->intr_count >= 3) {
fnic->rq_count = 1;
fnic->raw_wq_count = 1;
fnic->wq_copy_count = 1;
fnic->cq_count = 3;
fnic->intr_count = 3;
FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
"Using Legacy Interrupts\n");
vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_INTX);
return 0;
}
vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
return -EINVAL;
}
void fnic_clear_intr_mode(struct fnic *fnic)
{
switch (vnic_dev_get_intr_mode(fnic->vdev)) {
case VNIC_DEV_INTR_MODE_MSIX:
pci_disable_msix(fnic->pdev);
break;
case VNIC_DEV_INTR_MODE_MSI:
pci_disable_msi(fnic->pdev);
break;
default:
break;
}
vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_INTX);
}
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