freebsd-skq/sys/amd64/vmm/io/iommu.c
grehan d45b7f14ae Import of bhyve hypervisor and utilities, part 1.
vmm.ko - kernel module for VT-x, VT-d and hypervisor control
  bhyve  - user-space sequencer and i/o emulation
  vmmctl - dump of hypervisor register state
  libvmm - front-end to vmm.ko chardev interface

bhyve was designed and implemented by Neel Natu.

Thanks to the following folk from NetApp who helped to make this available:
	Joe CaraDonna
	Peter Snyder
	Jeff Heller
	Sandeep Mann
	Steve Miller
	Brian Pawlowski
2011-05-13 04:54:01 +00:00

231 lines
4.8 KiB
C

/*-
* Copyright (c) 2011 NetApp, Inc.
* 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 NETAPP, INC ``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 NETAPP, INC 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.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <machine/md_var.h>
#include "vmm_util.h"
#include "iommu.h"
static boolean_t iommu_avail;
static struct iommu_ops *ops;
static void *host_domain;
static __inline int
IOMMU_INIT(void)
{
if (ops != NULL)
return ((*ops->init)());
else
return (ENXIO);
}
static __inline void
IOMMU_CLEANUP(void)
{
if (ops != NULL && iommu_avail)
(*ops->cleanup)();
}
static __inline void *
IOMMU_CREATE_DOMAIN(vm_paddr_t maxaddr)
{
if (ops != NULL && iommu_avail)
return ((*ops->create_domain)(maxaddr));
else
return (NULL);
}
static __inline void
IOMMU_DESTROY_DOMAIN(void *dom)
{
if (ops != NULL && iommu_avail)
(*ops->destroy_domain)(dom);
}
static __inline uint64_t
IOMMU_CREATE_MAPPING(void *domain, vm_paddr_t gpa, vm_paddr_t hpa, uint64_t len)
{
if (ops != NULL && iommu_avail)
return ((*ops->create_mapping)(domain, gpa, hpa, len));
else
return (len); /* XXX */
}
static __inline void
IOMMU_ADD_DEVICE(void *domain, int bus, int slot, int func)
{
if (ops != NULL && iommu_avail)
(*ops->add_device)(domain, bus, slot, func);
}
static __inline void
IOMMU_REMOVE_DEVICE(void *domain, int bus, int slot, int func)
{
if (ops != NULL && iommu_avail)
(*ops->remove_device)(domain, bus, slot, func);
}
static __inline void
IOMMU_ENABLE(void)
{
if (ops != NULL && iommu_avail)
(*ops->enable)();
}
static __inline void
IOMMU_DISABLE(void)
{
if (ops != NULL && iommu_avail)
(*ops->disable)();
}
void
iommu_init(void)
{
int error, bus, slot, func;
vm_paddr_t maxaddr;
const char *name;
device_t dev;
if (vmm_is_intel())
ops = &iommu_ops_intel;
else if (vmm_is_amd())
ops = &iommu_ops_amd;
else
ops = NULL;
error = IOMMU_INIT();
if (error)
return;
iommu_avail = TRUE;
/*
* Create a domain for the devices owned by the host
*/
maxaddr = ptoa(Maxmem);
host_domain = IOMMU_CREATE_DOMAIN(maxaddr);
if (host_domain == NULL)
panic("iommu_init: unable to create a host domain");
/*
* Create 1:1 mappings from '0' to 'Maxmem' for devices assigned to
* the host
*/
iommu_create_mapping(host_domain, 0, 0, maxaddr);
for (bus = 0; bus <= PCI_BUSMAX; bus++) {
for (slot = 0; slot <= PCI_SLOTMAX; slot++) {
for (func = 0; func <= PCI_FUNCMAX; func++) {
dev = pci_find_dbsf(0, bus, slot, func);
if (dev == NULL)
continue;
/* skip passthrough devices */
name = device_get_name(dev);
if (name != NULL && strcmp(name, "ppt") == 0)
continue;
/* everything else belongs to the host domain */
iommu_add_device(host_domain, bus, slot, func);
}
}
}
IOMMU_ENABLE();
}
void
iommu_cleanup(void)
{
IOMMU_DISABLE();
IOMMU_DESTROY_DOMAIN(host_domain);
IOMMU_CLEANUP();
}
void *
iommu_create_domain(vm_paddr_t maxaddr)
{
return (IOMMU_CREATE_DOMAIN(maxaddr));
}
void
iommu_destroy_domain(void *dom)
{
IOMMU_DESTROY_DOMAIN(dom);
}
void
iommu_create_mapping(void *dom, vm_paddr_t gpa, vm_paddr_t hpa, size_t len)
{
uint64_t mapped, remaining;
remaining = len;
while (remaining > 0) {
mapped = IOMMU_CREATE_MAPPING(dom, gpa, hpa, remaining);
gpa += mapped;
hpa += mapped;
remaining -= mapped;
}
}
void
iommu_add_device(void *dom, int bus, int slot, int func)
{
IOMMU_ADD_DEVICE(dom, bus, slot, func);
}
void
iommu_remove_device(void *dom, int bus, int slot, int func)
{
IOMMU_REMOVE_DEVICE(dom, bus, slot, func);
}