The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/x86/xen/xen_msi.c

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    1 /*
    2  * Copyright (c) 2014 Roger Pau Monné <roger.pau@citrix.com>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.2/sys/x86/xen/xen_msi.c 272310 2014-09-30 16:46:45Z royger $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/bus.h>
   32 #include <sys/kernel.h>
   33 #include <sys/lock.h>
   34 #include <sys/malloc.h>
   35 #include <sys/mutex.h>
   36 #include <sys/sx.h>
   37 #include <sys/systm.h>
   38 #include <x86/apicreg.h>
   39 #include <machine/cputypes.h>
   40 #include <machine/md_var.h>
   41 #include <machine/frame.h>
   42 #include <machine/intr_machdep.h>
   43 #include <x86/apicvar.h>
   44 #include <machine/specialreg.h>
   45 #include <dev/pci/pcivar.h>
   46 
   47 #include <xen/xen_intr.h>
   48 #include <xen/xen_msi.h>
   49 
   50 static struct mtx msi_lock;
   51 static int msi_last_irq;
   52 
   53 void
   54 xen_msi_init(void)
   55 {
   56 
   57         mtx_init(&msi_lock, "msi", NULL, MTX_DEF);
   58 }
   59 
   60 /*
   61  * Try to allocate 'count' interrupt sources with contiguous IDT values.
   62  */
   63 int
   64 xen_msi_alloc(device_t dev, int count, int maxcount, int *irqs)
   65 {
   66         int i, ret = 0;
   67 
   68         mtx_lock(&msi_lock);
   69 
   70         /* If we would exceed the max, give up. */
   71         if ((msi_last_irq + count) > NUM_MSI_INTS) {
   72                 mtx_unlock(&msi_lock);
   73                 return (ENXIO);
   74         }
   75 
   76         /* Allocate MSI vectors */
   77         for (i = 0; i < count; i++)
   78                 irqs[i] = FIRST_MSI_INT + msi_last_irq++;
   79 
   80         mtx_unlock(&msi_lock);
   81 
   82         ret = xen_register_msi(dev, irqs[0], count);
   83         if (ret != 0)
   84                 return (ret);
   85 
   86         for (i = 0; i < count; i++)
   87                 nexus_add_irq(irqs[i]);
   88 
   89         return (0);
   90 }
   91 
   92 int
   93 xen_msi_release(int *irqs, int count)
   94 {
   95         int i, ret;
   96 
   97         for (i = 0; i < count; i++) {
   98                 ret = xen_release_msi(irqs[i]);
   99                 if (ret != 0)
  100                         return (ret);
  101         }
  102 
  103         return (0);
  104 }
  105 
  106 int
  107 xen_msi_map(int irq, uint64_t *addr, uint32_t *data)
  108 {
  109 
  110         return (0);
  111 }
  112 
  113 int
  114 xen_msix_alloc(device_t dev, int *irq)
  115 {
  116 
  117         return (ENXIO);
  118 }
  119 
  120 int
  121 xen_msix_release(int irq)
  122 {
  123 
  124         return (ENOENT);
  125 }

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