freebsd-dev/sys/x86/xen/xen_msi.c
Roger Pau Monné 44e06d158a msi: add Xen MSI implementation
This patch adds support for MSI interrupts when running on Xen. Apart
from adding the Xen related code needed in order to register MSI
interrupts this patch also makes the msi_init function a hook in
init_ops, so different MSI implementations can have different
initialization functions.

Sponsored by: Citrix Systems R&D

xen/interface/physdev.h:
 - Add the MAP_PIRQ_TYPE_MULTI_MSI to map multi-vector MSI to the Xen
   public interface.

x86/include/init.h:
 - Add a hook for setting custom msi_init methods.

amd64/amd64/machdep.c:
i386/i386/machdep.c:
 - Set the default msi_init hook to point to the native MSI
   initialization method.

x86/xen/pv.c:
 - Set the Xen MSI init hook when running as a Xen guest.

x86/x86/local_apic.c:
 - Call the msi_init hook instead of directly calling msi_init.

xen/xen_intr.h:
x86/xen/xen_intr.c:
 - Introduce support for registering/releasing MSI interrupts with
   Xen.
 - The MSI interrupts will use the same PIC as the IO APIC interrupts.

xen/xen_msi.h:
x86/xen/xen_msi.c:
 - Introduce a Xen MSI implementation.

x86/xen/xen_nexus.c:
 - Overwrite the default MSI hooks in the Xen Nexus to use the Xen MSI
   implementation.

x86/xen/xen_pci.c:
 - Introduce a Xen specific PCI bus that inherits from the ACPI PCI
   bus and overwrites the native MSI methods.
 - This is needed because when running under Xen the MSI messages used
   to configure MSI interrupts on PCI devices are written by Xen
   itself.

dev/acpica/acpi_pci.c:
 - Lower the quality of the ACPI PCI bus so the newly introduced Xen
   PCI bus can take over when needed.

conf/files.i386:
conf/files.amd64:
 - Add the newly created files to the build process.
2014-09-30 16:46:45 +00:00

126 lines
2.9 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/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_intr.h>
#include <xen/xen_msi.h>
static struct mtx msi_lock;
static int msi_last_irq;
void
xen_msi_init(void)
{
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_INTS) {
mtx_unlock(&msi_lock);
return (ENXIO);
}
/* Allocate MSI vectors */
for (i = 0; i < count; i++)
irqs[i] = FIRST_MSI_INT + 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);
}