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/*
* iommufd container backend
*
* Copyright (C) 2023 Intel Corporation.
* Copyright Red Hat, Inc. 2023
*
* Authors: Yi Liu <yi.l.liu@intel.com>
* Eric Auger <eric.auger@redhat.com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "qemu/osdep.h"
#include "sysemu/iommufd.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "qemu/module.h"
#include "qom/object_interfaces.h"
#include "qemu/error-report.h"
#include "monitor/monitor.h"
#include "trace.h"
#include <sys/ioctl.h>
#include <linux/iommufd.h>
static void iommufd_backend_init(Object *obj)
{
IOMMUFDBackend *be = IOMMUFD_BACKEND(obj);
be->fd = -1;
be->users = 0;
be->owned = true;
}
static void iommufd_backend_finalize(Object *obj)
{
IOMMUFDBackend *be = IOMMUFD_BACKEND(obj);
if (be->owned) {
close(be->fd);
be->fd = -1;
}
}
static void iommufd_backend_set_fd(Object *obj, const char *str, Error **errp)
{
IOMMUFDBackend *be = IOMMUFD_BACKEND(obj);
int fd = -1;
fd = monitor_fd_param(monitor_cur(), str, errp);
if (fd == -1) {
error_prepend(errp, "Could not parse remote object fd %s:", str);
return;
}
be->fd = fd;
be->owned = false;
trace_iommu_backend_set_fd(be->fd);
}
static bool iommufd_backend_can_be_deleted(UserCreatable *uc)
{
IOMMUFDBackend *be = IOMMUFD_BACKEND(uc);
return !be->users;
}
static void iommufd_backend_class_init(ObjectClass *oc, void *data)
{
UserCreatableClass *ucc = USER_CREATABLE_CLASS(oc);
ucc->can_be_deleted = iommufd_backend_can_be_deleted;
object_class_property_add_str(oc, "fd", NULL, iommufd_backend_set_fd);
}
int iommufd_backend_connect(IOMMUFDBackend *be, Error **errp)
{
int fd, ret = 0;
if (be->owned && !be->users) {
fd = qemu_open_old("/dev/iommu", O_RDWR);
if (fd < 0) {
error_setg_errno(errp, errno, "/dev/iommu opening failed");
ret = fd;
goto out;
}
be->fd = fd;
}
be->users++;
out:
trace_iommufd_backend_connect(be->fd, be->owned,
be->users, ret);
return ret;
}
void iommufd_backend_disconnect(IOMMUFDBackend *be)
{
if (!be->users) {
goto out;
}
be->users--;
if (!be->users && be->owned) {
close(be->fd);
be->fd = -1;
}
out:
trace_iommufd_backend_disconnect(be->fd, be->users);
}
int iommufd_backend_alloc_ioas(IOMMUFDBackend *be, uint32_t *ioas_id,
Error **errp)
{
int ret, fd = be->fd;
struct iommu_ioas_alloc alloc_data = {
.size = sizeof(alloc_data),
.flags = 0,
};
ret = ioctl(fd, IOMMU_IOAS_ALLOC, &alloc_data);
if (ret) {
error_setg_errno(errp, errno, "Failed to allocate ioas");
return ret;
}
*ioas_id = alloc_data.out_ioas_id;
trace_iommufd_backend_alloc_ioas(fd, *ioas_id, ret);
return ret;
}
void iommufd_backend_free_id(IOMMUFDBackend *be, uint32_t id)
{
int ret, fd = be->fd;
struct iommu_destroy des = {
.size = sizeof(des),
.id = id,
};
ret = ioctl(fd, IOMMU_DESTROY, &des);
trace_iommufd_backend_free_id(fd, id, ret);
if (ret) {
error_report("Failed to free id: %u %m", id);
}
}
int iommufd_backend_map_dma(IOMMUFDBackend *be, uint32_t ioas_id, hwaddr iova,
ram_addr_t size, void *vaddr, bool readonly)
{
int ret, fd = be->fd;
struct iommu_ioas_map map = {
.size = sizeof(map),
.flags = IOMMU_IOAS_MAP_READABLE |
IOMMU_IOAS_MAP_FIXED_IOVA,
.ioas_id = ioas_id,
.__reserved = 0,
.user_va = (uintptr_t)vaddr,
.iova = iova,
.length = size,
};
if (!readonly) {
map.flags |= IOMMU_IOAS_MAP_WRITEABLE;
}
ret = ioctl(fd, IOMMU_IOAS_MAP, &map);
trace_iommufd_backend_map_dma(fd, ioas_id, iova, size,
vaddr, readonly, ret);
if (ret) {
ret = -errno;
/* TODO: Not support mapping hardware PCI BAR region for now. */
if (errno == EFAULT) {
warn_report("IOMMU_IOAS_MAP failed: %m, PCI BAR?");
} else {
error_report("IOMMU_IOAS_MAP failed: %m");
}
}
return ret;
}
int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
hwaddr iova, ram_addr_t size)
{
int ret, fd = be->fd;
struct iommu_ioas_unmap unmap = {
.size = sizeof(unmap),
.ioas_id = ioas_id,
.iova = iova,
.length = size,
};
ret = ioctl(fd, IOMMU_IOAS_UNMAP, &unmap);
/*
* IOMMUFD takes mapping as some kind of object, unmapping
* nonexistent mapping is treated as deleting a nonexistent
* object and return ENOENT. This is different from legacy
* backend which allows it. vIOMMU may trigger a lot of
* redundant unmapping, to avoid flush the log, treat them
* as succeess for IOMMUFD just like legacy backend.
*/
if (ret && errno == ENOENT) {
trace_iommufd_backend_unmap_dma_non_exist(fd, ioas_id, iova, size, ret);
ret = 0;
} else {
trace_iommufd_backend_unmap_dma(fd, ioas_id, iova, size, ret);
}
if (ret) {
ret = -errno;
error_report("IOMMU_IOAS_UNMAP failed: %m");
}
return ret;
}
static const TypeInfo iommufd_backend_info = {
.name = TYPE_IOMMUFD_BACKEND,
.parent = TYPE_OBJECT,
.instance_size = sizeof(IOMMUFDBackend),
.instance_init = iommufd_backend_init,
.instance_finalize = iommufd_backend_finalize,
.class_size = sizeof(IOMMUFDBackendClass),
.class_init = iommufd_backend_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_USER_CREATABLE },
{ }
}
};
static void register_types(void)
{
type_register_static(&iommufd_backend_info);
}
type_init(register_types);
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