134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
/*
|
|
* Copyright (c) 2014 Roger Pau Monné <roger.pau@citrix.com>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/limits.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/sx.h>
|
|
#include <sys/systm.h>
|
|
#include <x86/apicreg.h>
|
|
#include <machine/cputypes.h>
|
|
#include <machine/md_var.h>
|
|
#include <machine/frame.h>
|
|
#include <machine/intr_machdep.h>
|
|
#include <x86/apicvar.h>
|
|
#include <machine/specialreg.h>
|
|
#include <dev/pci/pcivar.h>
|
|
|
|
#include <xen/xen-os.h>
|
|
#include <xen/xen_intr.h>
|
|
#include <xen/xen_msi.h>
|
|
|
|
static struct mtx msi_lock;
|
|
static u_int msi_last_irq;
|
|
|
|
void
|
|
xen_msi_init(void)
|
|
{
|
|
|
|
MPASS(num_io_irqs > 0);
|
|
first_msi_irq = num_io_irqs;
|
|
if (num_msi_irqs > UINT_MAX - first_msi_irq)
|
|
panic("num_msi_irqs too high");
|
|
num_io_irqs = first_msi_irq + num_msi_irqs;
|
|
|
|
mtx_init(&msi_lock, "msi", NULL, MTX_DEF);
|
|
}
|
|
|
|
/*
|
|
* Try to allocate 'count' interrupt sources with contiguous IDT values.
|
|
*/
|
|
int
|
|
xen_msi_alloc(device_t dev, int count, int maxcount, int *irqs)
|
|
{
|
|
int i, ret = 0;
|
|
|
|
mtx_lock(&msi_lock);
|
|
|
|
/* If we would exceed the max, give up. */
|
|
if (msi_last_irq + count > num_msi_irqs) {
|
|
mtx_unlock(&msi_lock);
|
|
return (ENXIO);
|
|
}
|
|
|
|
/* Allocate MSI vectors */
|
|
for (i = 0; i < count; i++)
|
|
irqs[i] = first_msi_irq + msi_last_irq++;
|
|
|
|
mtx_unlock(&msi_lock);
|
|
|
|
ret = xen_register_msi(dev, irqs[0], count);
|
|
if (ret != 0)
|
|
return (ret);
|
|
|
|
for (i = 0; i < count; i++)
|
|
nexus_add_irq(irqs[i]);
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
xen_msi_release(int *irqs, int count)
|
|
{
|
|
int i, ret;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
ret = xen_release_msi(irqs[i]);
|
|
if (ret != 0)
|
|
return (ret);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
xen_msi_map(int irq, uint64_t *addr, uint32_t *data)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
xen_msix_alloc(device_t dev, int *irq)
|
|
{
|
|
|
|
return (ENXIO);
|
|
}
|
|
|
|
int
|
|
xen_msix_release(int irq)
|
|
{
|
|
|
|
return (ENOENT);
|
|
}
|