drivers/scsi/fnic/fnic_isr.c

   1 /*
   2  * Copyright 2008 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4  *
   5  * This program is free software; you may redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16  * SOFTWARE.
  17  */
  18 #include <linux/string.h>
  19 #include <linux/errno.h>
  20 #include <linux/pci.h>
  21 #include <linux/interrupt.h>
  22 #include <scsi/libfc.h>
  23 #include <scsi/fc_frame.h>
  24 #include "vnic_dev.h"
  25 #include "vnic_intr.h"
  26 #include "vnic_stats.h"
  27 #include "fnic_io.h"
  28 #include "fnic.h"
  29
  30 static irqreturn_t fnic_isr_legacy(int irq, void *data)
  31 {
  32         struct fnic *fnic = data;
  33         u32 pba;
  34         unsigned long work_done = 0;
  35
  36         pba = vnic_intr_legacy_pba(fnic->legacy_pba);
  37         if (!pba)
  38                 return IRQ_NONE;
  39
  40         if (pba & (1 << FNIC_INTX_NOTIFY)) {
  41                 vnic_intr_return_all_credits(&fnic->intr[FNIC_INTX_NOTIFY]);
  42                 fnic_handle_link_event(fnic);
  43         }
  44
  45         if (pba & (1 << FNIC_INTX_ERR)) {
  46                 vnic_intr_return_all_credits(&fnic->intr[FNIC_INTX_ERR]);
  47                 fnic_log_q_error(fnic);
  48         }
  49
  50         if (pba & (1 << FNIC_INTX_WQ_RQ_COPYWQ)) {
  51                 work_done += fnic_wq_copy_cmpl_handler(fnic, 8);
  52                 work_done += fnic_wq_cmpl_handler(fnic, 4);
  53                 work_done += fnic_rq_cmpl_handler(fnic, 4);
  54
  55                 vnic_intr_return_credits(&fnic->intr[FNIC_INTX_WQ_RQ_COPYWQ],
  56                                          work_done,
  57                                          1 /* unmask intr */,
  58                                          1 /* reset intr timer */);
  59         }
  60
  61         return IRQ_HANDLED;
  62 }
  63
  64 static irqreturn_t fnic_isr_msi(int irq, void *data)
  65 {
  66         struct fnic *fnic = data;
  67         unsigned long work_done = 0;
  68
  69         work_done += fnic_wq_copy_cmpl_handler(fnic, 8);
  70         work_done += fnic_wq_cmpl_handler(fnic, 4);
  71         work_done += fnic_rq_cmpl_handler(fnic, 4);
  72
  73         vnic_intr_return_credits(&fnic->intr[0],
  74                                  work_done,
  75                                  1 /* unmask intr */,
  76                                  1 /* reset intr timer */);
  77
  78         return IRQ_HANDLED;
  79 }
  80
  81 static irqreturn_t fnic_isr_msix_rq(int irq, void *data)
  82 {
  83         struct fnic *fnic = data;
  84         unsigned long rq_work_done = 0;
  85
  86         rq_work_done = fnic_rq_cmpl_handler(fnic, 4);
  87         vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_RQ],
  88                                  rq_work_done,
  89                                  1 /* unmask intr */,
  90                                  1 /* reset intr timer */);
  91
  92         return IRQ_HANDLED;
  93 }
  94
  95 static irqreturn_t fnic_isr_msix_wq(int irq, void *data)
  96 {
  97         struct fnic *fnic = data;
  98         unsigned long wq_work_done = 0;
  99
 100         wq_work_done = fnic_wq_cmpl_handler(fnic, 4);
 101         vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_WQ],
 102                                  wq_work_done,
 103                                  1 /* unmask intr */,
 104                                  1 /* reset intr timer */);
 105         return IRQ_HANDLED;
 106 }
 107
 108 static irqreturn_t fnic_isr_msix_wq_copy(int irq, void *data)
 109 {
 110         struct fnic *fnic = data;
 111         unsigned long wq_copy_work_done = 0;
 112
 113         wq_copy_work_done = fnic_wq_copy_cmpl_handler(fnic, 8);
 114         vnic_intr_return_credits(&fnic->intr[FNIC_MSIX_WQ_COPY],
 115                                  wq_copy_work_done,
 116                                  1 /* unmask intr */,
 117                                  1 /* reset intr timer */);
 118         return IRQ_HANDLED;
 119 }
 120
 121 static irqreturn_t fnic_isr_msix_err_notify(int irq, void *data)
 122 {
 123         struct fnic *fnic = data;
 124
 125         vnic_intr_return_all_credits(&fnic->intr[FNIC_MSIX_ERR_NOTIFY]);
 126         fnic_log_q_error(fnic);
 127         fnic_handle_link_event(fnic);
 128
 129         return IRQ_HANDLED;
 130 }
 131
 132 void fnic_free_intr(struct fnic *fnic)
 133 {
 134         int i;
 135
 136         switch (vnic_dev_get_intr_mode(fnic->vdev)) {
 137         case VNIC_DEV_INTR_MODE_INTX:
 138         case VNIC_DEV_INTR_MODE_MSI:
 139                 free_irq(fnic->pdev->irq, fnic);
 140                 break;
 141
 142         case VNIC_DEV_INTR_MODE_MSIX:
 143                 for (i = 0; i < ARRAY_SIZE(fnic->msix); i++)
 144                         if (fnic->msix[i].requested)
 145                                 free_irq(fnic->msix_entry[i].vector,
 146                                          fnic->msix[i].devid);
 147                 break;
 148
 149         default:
 150                 break;
 151         }
 152 }
 153
 154 int fnic_request_intr(struct fnic *fnic)
 155 {
 156         int err = 0;
 157         int i;
 158
 159         switch (vnic_dev_get_intr_mode(fnic->vdev)) {
 160
 161         case VNIC_DEV_INTR_MODE_INTX:
 162                 err = request_irq(fnic->pdev->irq, &fnic_isr_legacy,
 163                                   IRQF_SHARED, DRV_NAME, fnic);
 164                 break;
 165
 166         case VNIC_DEV_INTR_MODE_MSI:
 167                 err = request_irq(fnic->pdev->irq, &fnic_isr_msi,
 168                                   0, fnic->name, fnic);
 169                 break;
 170
 171         case VNIC_DEV_INTR_MODE_MSIX:
 172
 173                 sprintf(fnic->msix[FNIC_MSIX_RQ].devname,
 174                         "%.11s-fcs-rq", fnic->name);
 175                 fnic->msix[FNIC_MSIX_RQ].isr = fnic_isr_msix_rq;
 176                 fnic->msix[FNIC_MSIX_RQ].devid = fnic;
 177
 178                 sprintf(fnic->msix[FNIC_MSIX_WQ].devname,
 179                         "%.11s-fcs-wq", fnic->name);
 180                 fnic->msix[FNIC_MSIX_WQ].isr = fnic_isr_msix_wq;
 181                 fnic->msix[FNIC_MSIX_WQ].devid = fnic;
 182
 183                 sprintf(fnic->msix[FNIC_MSIX_WQ_COPY].devname,
 184                         "%.11s-scsi-wq", fnic->name);
 185                 fnic->msix[FNIC_MSIX_WQ_COPY].isr = fnic_isr_msix_wq_copy;
 186                 fnic->msix[FNIC_MSIX_WQ_COPY].devid = fnic;
 187
 188                 sprintf(fnic->msix[FNIC_MSIX_ERR_NOTIFY].devname,
 189                         "%.11s-err-notify", fnic->name);
 190                 fnic->msix[FNIC_MSIX_ERR_NOTIFY].isr =
 191                         fnic_isr_msix_err_notify;
 192                 fnic->msix[FNIC_MSIX_ERR_NOTIFY].devid = fnic;
 193
 194                 for (i = 0; i < ARRAY_SIZE(fnic->msix); i++) {
 195                         err = request_irq(fnic->msix_entry[i].vector,
 196                                           fnic->msix[i].isr, 0,
 197                                           fnic->msix[i].devname,
 198                                           fnic->msix[i].devid);
 199                         if (err) {
 200                                 shost_printk(KERN_ERR, fnic->lport->host,
 201                                              "MSIX: request_irq"
 202                                              " failed %d\n", err);
 203                                 fnic_free_intr(fnic);
 204                                 break;
 205                         }
 206                         fnic->msix[i].requested = 1;
 207                 }
 208                 break;
 209
 210         default:
 211                 break;
 212         }
 213
 214         return err;
 215 }
 216
 217 int fnic_set_intr_mode(struct fnic *fnic)
 218 {
 219         unsigned int n = ARRAY_SIZE(fnic->rq);
 220         unsigned int m = ARRAY_SIZE(fnic->wq);
 221         unsigned int o = ARRAY_SIZE(fnic->wq_copy);
 222         unsigned int i;
 223
 224         /*
 225          * Set interrupt mode (INTx, MSI, MSI-X) depending
 226          * system capabilities.
 227          *
 228          * Try MSI-X first
 229          *
 230          * We need n RQs, m WQs, o Copy WQs, n+m+o CQs, and n+m+o+1 INTRs
 231          * (last INTR is used for WQ/RQ errors and notification area)
 232          */
 233
 234         BUG_ON(ARRAY_SIZE(fnic->msix_entry) < n + m + o + 1);
 235         for (i = 0; i < n + m + o + 1; i++)
 236                 fnic->msix_entry[i].entry = i;
 237
 238         if (fnic->rq_count >= n &&
 239             fnic->raw_wq_count >= m &&
 240             fnic->wq_copy_count >= o &&
 241             fnic->cq_count >= n + m + o) {
 242                 if (!pci_enable_msix(fnic->pdev, fnic->msix_entry,
 243                                     n + m + o + 1)) {
 244                         fnic->rq_count = n;
 245                         fnic->raw_wq_count = m;
 246                         fnic->wq_copy_count = o;
 247                         fnic->wq_count = m + o;
 248                         fnic->cq_count = n + m + o;
 249                         fnic->intr_count = n + m + o + 1;
 250                         fnic->err_intr_offset = FNIC_MSIX_ERR_NOTIFY;
 251
 252                         FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
 253                                      "Using MSI-X Interrupts\n");
 254                         vnic_dev_set_intr_mode(fnic->vdev,
 255                                                VNIC_DEV_INTR_MODE_MSIX);
 256                         return 0;
 257                 }
 258         }
 259
 260         /*
 261          * Next try MSI
 262          * We need 1 RQ, 1 WQ, 1 WQ_COPY, 3 CQs, and 1 INTR
 263          */
 264         if (fnic->rq_count >= 1 &&
 265             fnic->raw_wq_count >= 1 &&
 266             fnic->wq_copy_count >= 1 &&
 267             fnic->cq_count >= 3 &&
 268             fnic->intr_count >= 1 &&
 269             !pci_enable_msi(fnic->pdev)) {
 270
 271                 fnic->rq_count = 1;
 272                 fnic->raw_wq_count = 1;
 273                 fnic->wq_copy_count = 1;
 274                 fnic->wq_count = 2;
 275                 fnic->cq_count = 3;
 276                 fnic->intr_count = 1;
 277                 fnic->err_intr_offset = 0;
 278
 279                 FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
 280                              "Using MSI Interrupts\n");
 281                 vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_MSI);
 282
 283                 return 0;
 284         }
 285
 286         /*
 287          * Next try INTx
 288          * We need 1 RQ, 1 WQ, 1 WQ_COPY, 3 CQs, and 3 INTRs
 289          * 1 INTR is used for all 3 queues, 1 INTR for queue errors
 290          * 1 INTR for notification area
 291          */
 292
 293         if (fnic->rq_count >= 1 &&
 294             fnic->raw_wq_count >= 1 &&
 295             fnic->wq_copy_count >= 1 &&
 296             fnic->cq_count >= 3 &&
 297             fnic->intr_count >= 3) {
 298
 299                 fnic->rq_count = 1;
 300                 fnic->raw_wq_count = 1;
 301                 fnic->wq_copy_count = 1;
 302                 fnic->cq_count = 3;
 303                 fnic->intr_count = 3;
 304
 305                 FNIC_ISR_DBG(KERN_DEBUG, fnic->lport->host,
 306                              "Using Legacy Interrupts\n");
 307                 vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_INTX);
 308
 309                 return 0;
 310         }
 311
 312         vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
 313
 314         return -EINVAL;
 315 }
 316
 317 void fnic_clear_intr_mode(struct fnic *fnic)
 318 {
 319         switch (vnic_dev_get_intr_mode(fnic->vdev)) {
 320         case VNIC_DEV_INTR_MODE_MSIX:
 321                 pci_disable_msix(fnic->pdev);
 322                 break;
 323         case VNIC_DEV_INTR_MODE_MSI:
 324                 pci_disable_msi(fnic->pdev);
 325                 break;
 326         default:
 327                 break;
 328         }
 329
 330         vnic_dev_set_intr_mode(fnic->vdev, VNIC_DEV_INTR_MODE_INTX);
 331 }
 332