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/*
* Copyright (c) 2018 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <linux/vfio.h>
#include <sys/ioctl.h>
#include <vppinfra/linux/sysfs.h>
#include <vlib/vlib.h>
#include <vlib/unix/unix.h>
#include <vlib/pci/pci.h>
#include <vlib/linux/vfio.h>
#include <vlib/physmem.h>
#ifndef VFIO_NOIOMMU_IOMMU
#define VFIO_NOIOMMU_IOMMU 8
#endif
linux_vfio_main_t vfio_main;
clib_error_t *
vfio_map_physmem_page (vlib_main_t * vm, void *addr)
{
vlib_physmem_main_t *vpm = &vm->physmem_main;
linux_vfio_main_t *lvm = &vfio_main;
struct vfio_iommu_type1_dma_map dm = { 0 };
uword log2_page_size = vpm->pmalloc_main->def_log2_page_sz;
uword physmem_start = pointer_to_uword (vpm->pmalloc_main->base);
if (lvm->container_fd == -1)
return clib_error_return (0, "No cointainer fd");
u32 page_index = vlib_physmem_get_page_index (vm, addr);
if (clib_bitmap_get (lvm->physmem_pages_mapped, page_index))
{
vlib_log_debug (lvm->log_default, "map DMA va:%p page:%u already "
"mapped", addr, page_index);
return 0;
}
dm.argsz = sizeof (struct vfio_iommu_type1_dma_map);
dm.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
dm.vaddr = physmem_start + (page_index << log2_page_size);
dm.size = 1ULL << log2_page_size;
dm.iova = dm.vaddr;
vlib_log_debug (lvm->log_default, "map DMA page:%u va:0x%lx iova:%lx "
"size:0x%lx", page_index, dm.vaddr, dm.iova, dm.size);
if (ioctl (lvm->container_fd, VFIO_IOMMU_MAP_DMA, &dm) == -1)
{
vlib_log_err (lvm->log_default, "map DMA page:%u va:0x%lx iova:%lx "
"size:0x%lx failed, error %s (errno %d)", page_index,
dm.vaddr, dm.iova, dm.size, strerror (errno), errno);
return clib_error_return_unix (0, "physmem DMA map failed");
}
lvm->physmem_pages_mapped = clib_bitmap_set (lvm->physmem_pages_mapped,
page_index, 1);
return 0;
}
static linux_pci_vfio_iommu_group_t *
get_vfio_iommu_group (int group)
{
linux_vfio_main_t *lvm = &vfio_main;
uword *p;
p = hash_get (lvm->iommu_pool_index_by_group, group);
return p ? pool_elt_at_index (lvm->iommu_groups, p[0]) : 0;
}
static clib_error_t *
open_vfio_iommu_group (int group, int is_noiommu)
{
linux_vfio_main_t *lvm = &vfio_main;
linux_pci_vfio_iommu_group_t *g;
clib_error_t *err = 0;
struct vfio_group_status group_status;
u8 *s = 0;
int fd;
if (lvm->container_fd == -1)
{
if ((fd = open ("/dev/vfio/vfio", O_RDWR)) == -1)
return clib_error_return_unix (0, "failed to open VFIO container");
if (ioctl (fd, VFIO_GET_API_VERSION) != VFIO_API_VERSION)
{
close (fd);
return clib_error_return_unix (0, "incompatible VFIO version");
}
lvm->iommu_pool_index_by_group = hash_create (0, sizeof (uword));
lvm->container_fd = fd;
}
g = get_vfio_iommu_group (group);
if (g)
{
g->refcnt++;
return 0;
}
s = format (s, "/dev/vfio/%s%u%c", is_noiommu ? "noiommu-" : "", group, 0);
fd = open ((char *) s, O_RDWR);
if (fd < 0)
return clib_error_return_unix (0, "open '%s'", s);
group_status.argsz = sizeof (group_status);
if (ioctl (fd, VFIO_GROUP_GET_STATUS, &group_status) < 0)
{
err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_STATUS) '%s'",
s);
goto error;
}
if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE))
{
err = clib_error_return (0, "iommu group %d is not viable (not all "
"devices in this group bound to vfio-pci)",
group);
goto error;
}
if (ioctl (fd, VFIO_GROUP_SET_CONTAINER, &lvm->container_fd) < 0)
{
err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_SET_CONTAINER) '%s'",
s);
goto error;
}
if (lvm->iommu_mode == 0)
{
if (is_noiommu)
lvm->iommu_mode = VFIO_NOIOMMU_IOMMU;
else
lvm->iommu_mode = VFIO_TYPE1_IOMMU;
if (ioctl (lvm->container_fd, VFIO_SET_IOMMU, lvm->iommu_mode) < 0)
{
err = clib_error_return_unix (0, "ioctl(VFIO_SET_IOMMU) "
"'/dev/vfio/vfio'");
goto error;
}
}
pool_get (lvm->iommu_groups, g);
g->fd = fd;
g->refcnt = 1;
hash_set (lvm->iommu_pool_index_by_group, group, g - lvm->iommu_groups);
vec_free (s);
return 0;
error:
close (fd);
return err;
}
clib_error_t *
linux_vfio_group_get_device_fd (vlib_pci_addr_t * addr, int *fdp,
int *is_noiommu)
{
clib_error_t *err = 0;
linux_pci_vfio_iommu_group_t *g;
u8 *s = 0;
int iommu_group;
u8 *tmpstr;
int fd;
*is_noiommu = 0;
s =
format (s, "/sys/bus/pci/devices/%U/iommu_group%c", format_vlib_pci_addr,
addr, 0);
tmpstr = clib_sysfs_link_to_name ((char *) s);
if (tmpstr)
{
iommu_group = atoi ((char *) tmpstr);
vec_free (tmpstr);
}
else
{
err = clib_error_return (0, "Cannot find IOMMU group for PCI device ",
"'%U'", format_vlib_pci_addr, addr);
goto error;
}
vec_reset_length (s);
s = format (s, "/sys/bus/pci/devices/%U/iommu_group/name%c",
format_vlib_pci_addr, addr, 0);
err = clib_sysfs_read ((char *) s, "%s", &tmpstr);
if (err == 0)
{
if (strncmp ((char *) tmpstr, "vfio-noiommu", 12) == 0)
*is_noiommu = 1;
vec_free (tmpstr);
}
else
clib_error_free (err);
vec_reset_length (s);
if ((err = open_vfio_iommu_group (iommu_group, *is_noiommu)))
return err;
g = get_vfio_iommu_group (iommu_group);
s = format (s, "%U%c", format_vlib_pci_addr, addr, 0);
if ((fd = ioctl (g->fd, VFIO_GROUP_GET_DEVICE_FD, (char *) s)) < 0)
{
err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_DEVICE_FD) '%U'",
format_vlib_pci_addr, addr);
goto error;
}
vec_reset_length (s);
*fdp = fd;
error:
vec_free (s);
return err;
}
clib_error_t *
linux_vfio_init (vlib_main_t * vm)
{
linux_vfio_main_t *lvm = &vfio_main;
lvm->log_default = vlib_log_register_class ("vfio", 0);
lvm->container_fd = -1;
return 0;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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