336 lines
8.6 KiB
C
336 lines
8.6 KiB
C
/*
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* Copyright 2008 Cisco Systems, Inc. All rights reserved.
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* Copyright 2007 Nuova Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/pci.h>
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#include <linux/interrupt.h>
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#include <scsi/libfc.h>
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#include <scsi/fc_frame.h>
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#include "vnic_dev.h"
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#include "vnic_intr.h"
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#include "vnic_stats.h"
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#include "fnic_io.h"
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#include "fnic.h"
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static irqreturn_t fnic_isr_legacy(int irq, void *data)
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{
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struct fnic *fnic = data;
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u32 pba;
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unsigned long work_done = 0;
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pba = vnic_intr_legacy_pba(fnic->legacy_pba);
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if (!pba)
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return IRQ_NONE;
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fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
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atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
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if (pba & (1 << FNIC_INTX_NOTIFY)) {
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vnic_intr_return_all_credits(&fnic->intr[FNIC_INTX_NOTIFY]);
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fnic_handle_link_event(fnic);
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}
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if (pba & (1 << FNIC_INTX_ERR)) {
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vnic_intr_return_all_credits(&fnic->intr[FNIC_INTX_ERR]);
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fnic_log_q_error(fnic);
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}
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if (pba & (1 << FNIC_INTX_WQ_RQ_COPYWQ)) {
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work_done += fnic_wq_copy_cmpl_handler(fnic, io_completions);
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work_done += fnic_wq_cmpl_handler(fnic, -1);
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work_done += fnic_rq_cmpl_handler(fnic, -1);
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vnic_intr_return_credits(&fnic->intr[FNIC_INTX_WQ_RQ_COPYWQ],
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work_done,
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1 /* unmask intr */,
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1 /* reset intr timer */);
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}
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return IRQ_HANDLED;
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}
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static irqreturn_t fnic_isr_msi(int irq, void *data)
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{
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struct fnic *fnic = data;
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unsigned long work_done = 0;
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fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
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atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
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work_done += fnic_wq_copy_cmpl_handler(fnic, io_completions);
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work_done += fnic_wq_cmpl_handler(fnic, -1);
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work_done += fnic_rq_cmpl_handler(fnic, -1);
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vnic_intr_return_credits(&fnic->intr[0],
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work_done,
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1 /* unmask intr */,
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1 /* reset intr timer */);
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return IRQ_HANDLED;
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}
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static irqreturn_t fnic_isr_msix_rq(int irq, void *data)
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{
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struct fnic *fnic = data;
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unsigned long rq_work_done = 0;
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fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
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atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
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rq_work_done = fnic_rq_cmpl_handler(fnic, -1);
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vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_RQ],
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rq_work_done,
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1 /* unmask intr */,
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1 /* reset intr timer */);
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return IRQ_HANDLED;
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}
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static irqreturn_t fnic_isr_msix_wq(int irq, void *data)
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{
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struct fnic *fnic = data;
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unsigned long wq_work_done = 0;
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fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
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atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
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wq_work_done = fnic_wq_cmpl_handler(fnic, -1);
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vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_WQ],
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wq_work_done,
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1 /* unmask intr */,
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1 /* reset intr timer */);
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return IRQ_HANDLED;
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}
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static irqreturn_t fnic_isr_msix_wq_copy(int irq, void *data)
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{
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struct fnic *fnic = data;
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unsigned long wq_copy_work_done = 0;
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fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
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atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
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wq_copy_work_done = fnic_wq_copy_cmpl_handler(fnic, io_completions);
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vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_WQ_COPY],
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wq_copy_work_done,
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1 /* unmask intr */,
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1 /* reset intr timer */);
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return IRQ_HANDLED;
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}
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static irqreturn_t fnic_isr_msix_err_notify(int irq, void *data)
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{
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struct fnic *fnic = data;
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fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
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atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
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vnic_intr_return_all_credits(&fnic->intr[FNIC_MSIX_ERR_NOTIFY]);
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fnic_log_q_error(fnic);
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fnic_handle_link_event(fnic);
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return IRQ_HANDLED;
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}
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void fnic_free_intr(struct fnic *fnic)
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{
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int i;
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switch (vnic_dev_get_intr_mode(fnic->vdev)) {
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case VNIC_DEV_INTR_MODE_INTX:
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case VNIC_DEV_INTR_MODE_MSI:
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free_irq(pci_irq_vector(fnic->pdev, 0), fnic);
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break;
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case VNIC_DEV_INTR_MODE_MSIX:
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for (i = 0; i < ARRAY_SIZE(fnic->msix); i++)
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if (fnic->msix[i].requested)
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free_irq(pci_irq_vector(fnic->pdev, i),
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fnic->msix[i].devid);
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break;
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default:
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break;
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}
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}
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int fnic_request_intr(struct fnic *fnic)
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{
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int err = 0;
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int i;
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switch (vnic_dev_get_intr_mode(fnic->vdev)) {
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case VNIC_DEV_INTR_MODE_INTX:
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err = request_irq(pci_irq_vector(fnic->pdev, 0),
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&fnic_isr_legacy, IRQF_SHARED, DRV_NAME, fnic);
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break;
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case VNIC_DEV_INTR_MODE_MSI:
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err = request_irq(pci_irq_vector(fnic->pdev, 0), &fnic_isr_msi,
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0, fnic->name, fnic);
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break;
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case VNIC_DEV_INTR_MODE_MSIX:
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sprintf(fnic->msix[FNIC_MSIX_RQ].devname,
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"%.11s-fcs-rq", fnic->name);
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fnic->msix[FNIC_MSIX_RQ].isr = fnic_isr_msix_rq;
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fnic->msix[FNIC_MSIX_RQ].devid = fnic;
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sprintf(fnic->msix[FNIC_MSIX_WQ].devname,
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"%.11s-fcs-wq", fnic->name);
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fnic->msix[FNIC_MSIX_WQ].isr = fnic_isr_msix_wq;
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fnic->msix[FNIC_MSIX_WQ].devid = fnic;
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sprintf(fnic->msix[FNIC_MSIX_WQ_COPY].devname,
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"%.11s-scsi-wq", fnic->name);
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fnic->msix[FNIC_MSIX_WQ_COPY].isr = fnic_isr_msix_wq_copy;
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fnic->msix[FNIC_MSIX_WQ_COPY].devid = fnic;
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sprintf(fnic->msix[FNIC_MSIX_ERR_NOTIFY].devname,
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"%.11s-err-notify", fnic->name);
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fnic->msix[FNIC_MSIX_ERR_NOTIFY].isr =
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fnic_isr_msix_err_notify;
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fnic->msix[FNIC_MSIX_ERR_NOTIFY].devid = fnic;
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for (i = 0; i < ARRAY_SIZE(fnic->msix); i++) {
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err = request_irq(pci_irq_vector(fnic->pdev, i),
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fnic->msix[i].isr, 0,
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fnic->msix[i].devname,
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fnic->msix[i].devid);
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if (err) {
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shost_printk(KERN_ERR, fnic->lport->host,
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"MSIX: request_irq"
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" failed %d\n", err);
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fnic_free_intr(fnic);
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break;
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}
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fnic->msix[i].requested = 1;
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}
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break;
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default:
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break;
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}
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return err;
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}
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int fnic_set_intr_mode(struct fnic *fnic)
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{
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unsigned int n = ARRAY_SIZE(fnic->rq);
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unsigned int m = ARRAY_SIZE(fnic->wq);
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unsigned int o = ARRAY_SIZE(fnic->wq_copy);
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/*
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* Set interrupt mode (INTx, MSI, MSI-X) depending
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* system capabilities.
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*
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* Try MSI-X first
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*
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* We need n RQs, m WQs, o Copy WQs, n+m+o CQs, and n+m+o+1 INTRs
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* (last INTR is used for WQ/RQ errors and notification area)
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*/
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if (fnic->rq_count >= n &&
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fnic->raw_wq_count >= m &&
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fnic->wq_copy_count >= o &&
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fnic->cq_count >= n + m + o) {
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int vecs = n + m + o + 1;
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if (pci_alloc_irq_vectors(fnic->pdev, vecs, vecs,
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PCI_IRQ_MSIX) == vecs) {
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fnic->rq_count = n;
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fnic->raw_wq_count = m;
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fnic->wq_copy_count = o;
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fnic->wq_count = m + o;
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fnic->cq_count = n + m + o;
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fnic->intr_count = vecs;
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fnic->err_intr_offset = FNIC_MSIX_ERR_NOTIFY;
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FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
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"Using MSI-X Interrupts\n");
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vnic_dev_set_intr_mode(fnic->vdev,
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VNIC_DEV_INTR_MODE_MSIX);
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return 0;
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}
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}
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/*
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* Next try MSI
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* We need 1 RQ, 1 WQ, 1 WQ_COPY, 3 CQs, and 1 INTR
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*/
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if (fnic->rq_count >= 1 &&
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fnic->raw_wq_count >= 1 &&
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fnic->wq_copy_count >= 1 &&
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fnic->cq_count >= 3 &&
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fnic->intr_count >= 1 &&
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pci_alloc_irq_vectors(fnic->pdev, 1, 1, PCI_IRQ_MSI) == 1) {
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fnic->rq_count = 1;
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fnic->raw_wq_count = 1;
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fnic->wq_copy_count = 1;
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fnic->wq_count = 2;
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fnic->cq_count = 3;
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fnic->intr_count = 1;
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fnic->err_intr_offset = 0;
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FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
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"Using MSI Interrupts\n");
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vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_MSI);
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return 0;
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}
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/*
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* Next try INTx
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* We need 1 RQ, 1 WQ, 1 WQ_COPY, 3 CQs, and 3 INTRs
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* 1 INTR is used for all 3 queues, 1 INTR for queue errors
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* 1 INTR for notification area
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*/
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if (fnic->rq_count >= 1 &&
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fnic->raw_wq_count >= 1 &&
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fnic->wq_copy_count >= 1 &&
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fnic->cq_count >= 3 &&
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fnic->intr_count >= 3) {
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fnic->rq_count = 1;
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fnic->raw_wq_count = 1;
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fnic->wq_copy_count = 1;
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fnic->cq_count = 3;
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fnic->intr_count = 3;
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FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
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"Using Legacy Interrupts\n");
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vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_INTX);
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return 0;
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}
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vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
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return -EINVAL;
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}
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void fnic_clear_intr_mode(struct fnic *fnic)
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{
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pci_free_irq_vectors(fnic->pdev);
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vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_INTX);
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}
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