snic_isr.c (5150B)
1/* 2 * Copyright 2014 Cisco Systems, Inc. All rights reserved. 3 * 4 * This program is free software; you may redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; version 2 of the License. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 15 * SOFTWARE. 16 */ 17 18#include <linux/string.h> 19#include <linux/errno.h> 20#include <linux/pci.h> 21#include <linux/interrupt.h> 22 23#include "vnic_dev.h" 24#include "vnic_intr.h" 25#include "vnic_stats.h" 26#include "snic_io.h" 27#include "snic.h" 28 29 30/* 31 * snic_isr_msix_wq : MSIx ISR for work queue. 32 */ 33 34static irqreturn_t 35snic_isr_msix_wq(int irq, void *data) 36{ 37 struct snic *snic = data; 38 unsigned long wq_work_done = 0; 39 40 snic->s_stats.misc.last_isr_time = jiffies; 41 atomic64_inc(&snic->s_stats.misc.ack_isr_cnt); 42 43 wq_work_done = snic_wq_cmpl_handler(snic, -1); 44 svnic_intr_return_credits(&snic->intr[SNIC_MSIX_WQ], 45 wq_work_done, 46 1 /* unmask intr */, 47 1 /* reset intr timer */); 48 49 return IRQ_HANDLED; 50} /* end of snic_isr_msix_wq */ 51 52static irqreturn_t 53snic_isr_msix_io_cmpl(int irq, void *data) 54{ 55 struct snic *snic = data; 56 unsigned long iocmpl_work_done = 0; 57 58 snic->s_stats.misc.last_isr_time = jiffies; 59 atomic64_inc(&snic->s_stats.misc.cmpl_isr_cnt); 60 61 iocmpl_work_done = snic_fwcq_cmpl_handler(snic, -1); 62 svnic_intr_return_credits(&snic->intr[SNIC_MSIX_IO_CMPL], 63 iocmpl_work_done, 64 1 /* unmask intr */, 65 1 /* reset intr timer */); 66 67 return IRQ_HANDLED; 68} /* end of snic_isr_msix_io_cmpl */ 69 70static irqreturn_t 71snic_isr_msix_err_notify(int irq, void *data) 72{ 73 struct snic *snic = data; 74 75 snic->s_stats.misc.last_isr_time = jiffies; 76 atomic64_inc(&snic->s_stats.misc.errnotify_isr_cnt); 77 78 svnic_intr_return_all_credits(&snic->intr[SNIC_MSIX_ERR_NOTIFY]); 79 snic_log_q_error(snic); 80 81 /*Handling link events */ 82 snic_handle_link_event(snic); 83 84 return IRQ_HANDLED; 85} /* end of snic_isr_msix_err_notify */ 86 87 88void 89snic_free_intr(struct snic *snic) 90{ 91 int i; 92 93 /* ONLY interrupt mode MSIX is supported */ 94 for (i = 0; i < ARRAY_SIZE(snic->msix); i++) { 95 if (snic->msix[i].requested) { 96 free_irq(pci_irq_vector(snic->pdev, i), 97 snic->msix[i].devid); 98 } 99 } 100} /* end of snic_free_intr */ 101 102int 103snic_request_intr(struct snic *snic) 104{ 105 int ret = 0, i; 106 enum vnic_dev_intr_mode intr_mode; 107 108 intr_mode = svnic_dev_get_intr_mode(snic->vdev); 109 SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX); 110 111 /* 112 * Currently HW supports single WQ and CQ. So passing devid as snic. 113 * When hardware supports multiple WQs and CQs, one idea is 114 * to pass devid as corresponding WQ or CQ ptr and retrieve snic 115 * from queue ptr. 116 * Except for err_notify, which is always one. 117 */ 118 sprintf(snic->msix[SNIC_MSIX_WQ].devname, 119 "%.11s-scsi-wq", 120 snic->name); 121 snic->msix[SNIC_MSIX_WQ].isr = snic_isr_msix_wq; 122 snic->msix[SNIC_MSIX_WQ].devid = snic; 123 124 sprintf(snic->msix[SNIC_MSIX_IO_CMPL].devname, 125 "%.11s-io-cmpl", 126 snic->name); 127 snic->msix[SNIC_MSIX_IO_CMPL].isr = snic_isr_msix_io_cmpl; 128 snic->msix[SNIC_MSIX_IO_CMPL].devid = snic; 129 130 sprintf(snic->msix[SNIC_MSIX_ERR_NOTIFY].devname, 131 "%.11s-err-notify", 132 snic->name); 133 snic->msix[SNIC_MSIX_ERR_NOTIFY].isr = snic_isr_msix_err_notify; 134 snic->msix[SNIC_MSIX_ERR_NOTIFY].devid = snic; 135 136 for (i = 0; i < ARRAY_SIZE(snic->msix); i++) { 137 ret = request_irq(pci_irq_vector(snic->pdev, i), 138 snic->msix[i].isr, 139 0, 140 snic->msix[i].devname, 141 snic->msix[i].devid); 142 if (ret) { 143 SNIC_HOST_ERR(snic->shost, 144 "MSI-X: request_irq(%d) failed %d\n", 145 i, 146 ret); 147 snic_free_intr(snic); 148 break; 149 } 150 snic->msix[i].requested = 1; 151 } 152 153 return ret; 154} /* end of snic_request_intr */ 155 156int 157snic_set_intr_mode(struct snic *snic) 158{ 159 unsigned int n = ARRAY_SIZE(snic->wq); 160 unsigned int m = SNIC_CQ_IO_CMPL_MAX; 161 unsigned int vecs = n + m + 1; 162 163 /* 164 * We need n WQs, m CQs, and n+m+1 INTRs 165 * (last INTR is used for WQ/CQ errors and notification area 166 */ 167 BUILD_BUG_ON((ARRAY_SIZE(snic->wq) + SNIC_CQ_IO_CMPL_MAX) > 168 ARRAY_SIZE(snic->intr)); 169 170 if (snic->wq_count < n || snic->cq_count < n + m) 171 goto fail; 172 173 if (pci_alloc_irq_vectors(snic->pdev, vecs, vecs, PCI_IRQ_MSIX) < 0) 174 goto fail; 175 176 snic->wq_count = n; 177 snic->cq_count = n + m; 178 snic->intr_count = vecs; 179 snic->err_intr_offset = SNIC_MSIX_ERR_NOTIFY; 180 181 SNIC_ISR_DBG(snic->shost, "Using MSI-X Interrupts\n"); 182 svnic_dev_set_intr_mode(snic->vdev, VNIC_DEV_INTR_MODE_MSIX); 183 return 0; 184fail: 185 svnic_dev_set_intr_mode(snic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN); 186 return -EINVAL; 187} /* end of snic_set_intr_mode */ 188 189void 190snic_clear_intr_mode(struct snic *snic) 191{ 192 pci_free_irq_vectors(snic->pdev); 193 svnic_dev_set_intr_mode(snic->vdev, VNIC_DEV_INTR_MODE_INTX); 194}