release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/scsi/bfa/bfad_intr.c

   1 /*
   2  * Copyright (c) 2005-2009 Brocade Communications Systems, Inc.
   3  * All rights reserved
   4  * www.brocade.com
   5  *
   6  * Linux driver for Brocade Fibre Channel Host Bus Adapter.
   7  *
   8  * This program is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License (GPL) Version 2 as
  10  * published by the Free Software Foundation
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #include "bfad_drv.h"
  19 #include "bfad_trcmod.h"
  20
  21 BFA_TRC_FILE(LDRV, INTR);
  22
  23 /**
  24  *  bfa_isr BFA driver interrupt functions
  25  */
  26 static int msix_disable_cb;
  27 static int msix_disable_ct;
  28 module_param(msix_disable_cb, int, S_IRUGO | S_IWUSR);
  29 MODULE_PARM_DESC(msix_disable_cb, "Disable MSIX for Brocade-415/425/815/825"
  30                 " cards, default=0, Range[false:0|true:1]");
  31 module_param(msix_disable_ct, int, S_IRUGO | S_IWUSR);
  32 MODULE_PARM_DESC(msix_disable_ct, "Disable MSIX for Brocade-1010/1020/804"
  33                 " cards, default=0, Range[false:0|true:1]");
  34 /**
  35  * Line based interrupt handler.
  36  */
  37 static irqreturn_t
  38 bfad_intx(int irq, void *dev_id)
  39 {
  40         struct bfad_s         *bfad = dev_id;
  41         struct list_head         doneq;
  42         unsigned long   flags;
  43         bfa_boolean_t rc;
  44
  45         spin_lock_irqsave(&bfad->bfad_lock, flags);
  46         rc = bfa_intx(&bfad->bfa);
  47         if (!rc) {
  48                 spin_unlock_irqrestore(&bfad->bfad_lock, flags);
  49                 return IRQ_NONE;
  50         }
  51
  52         bfa_comp_deq(&bfad->bfa, &doneq);
  53         spin_unlock_irqrestore(&bfad->bfad_lock, flags);
  54
  55         if (!list_empty(&doneq)) {
  56                 bfa_comp_process(&bfad->bfa, &doneq);
  57
  58                 spin_lock_irqsave(&bfad->bfad_lock, flags);
  59                 bfa_comp_free(&bfad->bfa, &doneq);
  60                 spin_unlock_irqrestore(&bfad->bfad_lock, flags);
  61                 bfa_trc_fp(bfad, irq);
  62         }
  63
  64         return IRQ_HANDLED;
  65
  66 }
  67
  68 static irqreturn_t
  69 bfad_msix(int irq, void *dev_id)
  70 {
  71         struct bfad_msix_s *vec = dev_id;
  72         struct bfad_s *bfad = vec->bfad;
  73         struct list_head doneq;
  74         unsigned long   flags;
  75
  76         spin_lock_irqsave(&bfad->bfad_lock, flags);
  77
  78         bfa_msix(&bfad->bfa, vec->msix.entry);
  79         bfa_comp_deq(&bfad->bfa, &doneq);
  80         spin_unlock_irqrestore(&bfad->bfad_lock, flags);
  81
  82         if (!list_empty(&doneq)) {
  83                 bfa_comp_process(&bfad->bfa, &doneq);
  84
  85                 spin_lock_irqsave(&bfad->bfad_lock, flags);
  86                 bfa_comp_free(&bfad->bfa, &doneq);
  87                 spin_unlock_irqrestore(&bfad->bfad_lock, flags);
  88         }
  89
  90         return IRQ_HANDLED;
  91 }
  92
  93 /**
  94  * Initialize the MSIX entry table.
  95  */
  96 static void
  97 bfad_init_msix_entry(struct bfad_s *bfad, struct msix_entry *msix_entries,
  98                          int mask, int max_bit)
  99 {
 100         int             i;
 101         int             match = 0x00000001;
 102
 103         for (i = 0, bfad->nvec = 0; i < MAX_MSIX_ENTRY; i++) {
 104                 if (mask & match) {
 105                         bfad->msix_tab[bfad->nvec].msix.entry = i;
 106                         bfad->msix_tab[bfad->nvec].bfad = bfad;
 107                         msix_entries[bfad->nvec].entry = i;
 108                         bfad->nvec++;
 109                 }
 110
 111                 match <<= 1;
 112         }
 113
 114 }
 115
 116 int
 117 bfad_install_msix_handler(struct bfad_s *bfad)
 118 {
 119         int             i, error = 0;
 120
 121         for (i = 0; i < bfad->nvec; i++) {
 122                 error = request_irq(bfad->msix_tab[i].msix.vector,
 123                                     (irq_handler_t) bfad_msix, 0,
 124                                     BFAD_DRIVER_NAME, &bfad->msix_tab[i]);
 125                 bfa_trc(bfad, i);
 126                 bfa_trc(bfad, bfad->msix_tab[i].msix.vector);
 127                 if (error) {
 128                         int             j;
 129
 130                         for (j = 0; j < i; j++)
 131                                 free_irq(bfad->msix_tab[j].msix.vector,
 132                                                 &bfad->msix_tab[j]);
 133
 134                         return 1;
 135                 }
 136         }
 137
 138         return 0;
 139 }
 140
 141 /**
 142  * Setup MSIX based interrupt.
 143  */
 144 int
 145 bfad_setup_intr(struct bfad_s *bfad)
 146 {
 147         int error = 0;
 148         u32 mask = 0, i, num_bit = 0, max_bit = 0;
 149         struct msix_entry msix_entries[MAX_MSIX_ENTRY];
 150         struct pci_dev *pdev = bfad->pcidev;
 151
 152         /* Call BFA to get the msix map for this PCI function.  */
 153         bfa_msix_getvecs(&bfad->bfa, &mask, &num_bit, &max_bit);
 154
 155         /* Set up the msix entry table */
 156         bfad_init_msix_entry(bfad, msix_entries, mask, max_bit);
 157
 158         if ((bfa_asic_id_ct(pdev->device) && !msix_disable_ct) ||
 159                 (!bfa_asic_id_ct(pdev->device) && !msix_disable_cb)) {
 160
 161                 error = pci_enable_msix(bfad->pcidev, msix_entries, bfad->nvec);
 162                 if (error) {
 163                         /*
 164                          * Only error number of vector is available.
 165                          * We don't have a mechanism to map multiple
 166                          * interrupts into one vector, so even if we
 167                          * can try to request less vectors, we don't
 168                          * know how to associate interrupt events to
 169                          *  vectors. Linux doesn't dupicate vectors
 170                          * in the MSIX table for this case.
 171                          */
 172
 173                         printk(KERN_WARNING "bfad%d: "
 174                                 "pci_enable_msix failed (%d),"
 175                                 " use line based.\n", bfad->inst_no, error);
 176
 177                         goto line_based;
 178                 }
 179
 180                 /* Save the vectors */
 181                 for (i = 0; i < bfad->nvec; i++) {
 182                         bfa_trc(bfad, msix_entries[i].vector);
 183                         bfad->msix_tab[i].msix.vector = msix_entries[i].vector;
 184                 }
 185
 186                 bfa_msix_init(&bfad->bfa, bfad->nvec);
 187
 188                 bfad->bfad_flags |= BFAD_MSIX_ON;
 189
 190                 return error;
 191         }
 192
 193 line_based:
 194         error = 0;
 195         if (request_irq
 196             (bfad->pcidev->irq, (irq_handler_t) bfad_intx, BFAD_IRQ_FLAGS,
 197              BFAD_DRIVER_NAME, bfad) != 0) {
 198                 /* Enable interrupt handler failed */
 199                 return 1;
 200         }
 201
 202         return error;
 203 }
 204
 205 void
 206 bfad_remove_intr(struct bfad_s *bfad)
 207 {
 208         int             i;
 209
 210         if (bfad->bfad_flags & BFAD_MSIX_ON) {
 211                 for (i = 0; i < bfad->nvec; i++)
 212                         free_irq(bfad->msix_tab[i].msix.vector,
 213                                         &bfad->msix_tab[i]);
 214
 215                 pci_disable_msix(bfad->pcidev);
 216                 bfad->bfad_flags &= ~BFAD_MSIX_ON;
 217         } else {
 218                 free_irq(bfad->pcidev->irq, bfad);
 219         }
 220 }