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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;
- fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
- atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
- 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, -1);
- work_done += fnic_wq_cmpl_handler(fnic, -1);
- work_done += fnic_rq_cmpl_handler(fnic, -1);
- 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;
- fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
- atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
- work_done += fnic_wq_copy_cmpl_handler(fnic, -1);
- work_done += fnic_wq_cmpl_handler(fnic, -1);
- work_done += fnic_rq_cmpl_handler(fnic, -1);
- 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;
- fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
- atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
- rq_work_done = fnic_rq_cmpl_handler(fnic, -1);
- 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;
- fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
- atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
- wq_work_done = fnic_wq_cmpl_handler(fnic, -1);
- 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;
- fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
- atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
- wq_copy_work_done = fnic_wq_copy_cmpl_handler(fnic, -1);
- 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;
- fnic->fnic_stats.misc_stats.last_isr_time = jiffies;
- atomic64_inc(&fnic->fnic_stats.misc_stats.isr_count);
- 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_exact(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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