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("$FreeBSD$");
   29 
   30 #include <sys/param.h>
   31 #include <sys/bus.h>
   32 #include <sys/kernel.h>
   33 #include <sys/limits.h>
   34 #include <sys/lock.h>
   35 #include <sys/malloc.h>
   36 #include <sys/mutex.h>
   37 #include <sys/sx.h>
   38 #include <sys/systm.h>
   39 #include <x86/apicreg.h>
   40 #include <machine/cputypes.h>
   41 #include <machine/md_var.h>
   42 #include <machine/frame.h>
   43 #include <machine/intr_machdep.h>
   44 #include <x86/apicvar.h>
   45 #include <machine/specialreg.h>
   46 #include <dev/pci/pcivar.h>
   47 
   48 #include <xen/xen-os.h>
   49 #include <xen/xen_intr.h>
   50 #include <xen/xen_msi.h>
   51 
   52 static struct mtx msi_lock;
   53 static u_int msi_last_irq;
   54 
   55 void
   56 xen_msi_init(void)
   57 {
   58 
   59         MPASS(num_io_irqs > 0);
   60         first_msi_irq = min(MINIMUM_MSI_INT, num_io_irqs);
   61         if (num_msi_irqs > UINT_MAX - first_msi_irq)
   62                 panic("num_msi_irqs too high");
   63         num_io_irqs = first_msi_irq + num_msi_irqs;
   64 
   65         mtx_init(&msi_lock, "msi", NULL, MTX_DEF);
   66 }
   67 
   68 /*
   69  * Try to allocate 'count' interrupt sources with contiguous IDT values.
   70  */
   71 int
   72 xen_msi_alloc(device_t dev, int count, int maxcount, int *irqs)
   73 {
   74         int i, ret = 0;
   75 
   76         mtx_lock(&msi_lock);
   77 
   78         /* If we would exceed the max, give up. */
   79         if (msi_last_irq + count > num_msi_irqs) {
   80                 mtx_unlock(&msi_lock);
   81                 return (ENXIO);
   82         }
   83 
   84         /* Allocate MSI vectors */
   85         for (i = 0; i < count; i++)
   86                 irqs[i] = first_msi_irq + msi_last_irq++;
   87 
   88         mtx_unlock(&msi_lock);
   89 
   90         ret = xen_register_msi(dev, irqs[0], count);
   91         if (ret != 0)
   92                 return (ret);
   93 
   94         for (i = 0; i < count; i++)
   95                 nexus_add_irq(irqs[i]);
   96 
   97         return (0);
   98 }
   99 
  100 int
  101 xen_msi_release(int *irqs, int count)
  102 {
  103         int i, ret;
  104 
  105         for (i = 0; i < count; i++) {
  106                 ret = xen_release_msi(irqs[i]);
  107                 if (ret != 0)
  108                         return (ret);
  109         }
  110 
  111         return (0);
  112 }
  113 
  114 int
  115 xen_msi_map(int irq, uint64_t *addr, uint32_t *data)
  116 {
  117 
  118         return (0);
  119 }
  120 
  121 int
  122 xen_msix_alloc(device_t dev, int *irq)
  123 {
  124 
  125         return (ENXIO);
  126 }
  127 
  128 int
  129 xen_msix_release(int irq)
  130 {
  131 
  132         return (ENOENT);
  133 }

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