2 * Copyright (c) 2018 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
17 #include <sys/types.h>
20 #include <linux/vfio.h>
21 #include <sys/ioctl.h>
23 #include <vppinfra/linux/sysfs.h>
25 #include <vlib/vlib.h>
26 #include <vlib/unix/unix.h>
27 #include <vlib/pci/pci.h>
28 #include <vlib/linux/vfio.h>
29 #include <vlib/physmem.h>
31 #ifndef VFIO_NOIOMMU_IOMMU
32 #define VFIO_NOIOMMU_IOMMU 8
35 linux_vfio_main_t vfio_main;
38 map_regions (vlib_main_t * vm, int fd)
40 vlib_physmem_main_t *vpm = &physmem_main;
41 vlib_physmem_region_t *pr;
42 struct vfio_iommu_type1_dma_map dm = { 0 };
45 dm.argsz = sizeof (struct vfio_iommu_type1_dma_map);
46 dm.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
49 pool_foreach (pr, vpm->regions,
51 vec_foreach_index (i, pr->page_table)
54 dm.vaddr = pointer_to_uword (pr->mem) + (i << pr->log2_page_size);
55 dm.size = 1 << pr->log2_page_size;
57 if ((rv = ioctl (fd, VFIO_IOMMU_MAP_DMA, &dm)))
66 linux_vfio_dma_map_regions (vlib_main_t * vm)
68 linux_vfio_main_t *lvm = &vfio_main;
70 if (lvm->container_fd != -1)
71 map_regions (vm, lvm->container_fd);
74 static linux_pci_vfio_iommu_group_t *
75 get_vfio_iommu_group (int group)
77 linux_vfio_main_t *lvm = &vfio_main;
80 p = hash_get (lvm->iommu_pool_index_by_group, group);
82 return p ? pool_elt_at_index (lvm->iommu_groups, p[0]) : 0;
86 open_vfio_iommu_group (int group, int is_noiommu)
88 linux_vfio_main_t *lvm = &vfio_main;
89 linux_pci_vfio_iommu_group_t *g;
90 clib_error_t *err = 0;
91 struct vfio_group_status group_status;
95 g = get_vfio_iommu_group (group);
101 s = format (s, "/dev/vfio/%s%u%c", is_noiommu ? "noiommu-" : "", group, 0);
102 fd = open ((char *) s, O_RDWR);
104 return clib_error_return_unix (0, "open '%s'", s);
106 group_status.argsz = sizeof (group_status);
107 if (ioctl (fd, VFIO_GROUP_GET_STATUS, &group_status) < 0)
109 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_STATUS) '%s'",
114 if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE))
116 err = clib_error_return (0, "iommu group %d is not viable (not all "
117 "devices in this group bound to vfio-pci)",
122 if (ioctl (fd, VFIO_GROUP_SET_CONTAINER, &lvm->container_fd) < 0)
124 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_SET_CONTAINER) '%s'",
129 if (lvm->iommu_mode == 0)
132 lvm->iommu_mode = VFIO_NOIOMMU_IOMMU;
134 lvm->iommu_mode = VFIO_TYPE1_IOMMU;
136 if (ioctl (lvm->container_fd, VFIO_SET_IOMMU, lvm->iommu_mode) < 0)
138 err = clib_error_return_unix (0, "ioctl(VFIO_SET_IOMMU) "
145 pool_get (lvm->iommu_groups, g);
148 hash_set (lvm->iommu_pool_index_by_group, group, g - lvm->iommu_groups);
157 linux_vfio_group_get_device_fd (vlib_pci_addr_t * addr, int *fdp)
159 clib_error_t *err = 0;
160 linux_pci_vfio_iommu_group_t *g;
167 s = format (s, "/sys/bus/pci/devices/%U/iommu_group", format_vlib_pci_addr,
169 tmpstr = clib_sysfs_link_to_name ((char *) s);
172 iommu_group = atoi ((char *) tmpstr);
177 err = clib_error_return (0, "Cannot find IOMMU group for PCI device ",
178 "'%U'", format_vlib_pci_addr, addr);
181 vec_reset_length (s);
184 format (s, "/sys/bus/pci/devices/%U/iommu_group/name",
185 format_vlib_pci_addr, addr);
186 err = clib_sysfs_read ((char *) s, "%s", &tmpstr);
189 if (strncmp ((char *) tmpstr, "vfio-noiommu", 12) == 0)
194 clib_error_free (err);
195 vec_reset_length (s);
196 if ((err = open_vfio_iommu_group (iommu_group, is_noiommu)))
199 g = get_vfio_iommu_group (iommu_group);
201 s = format (s, "%U%c", format_vlib_pci_addr, addr, 0);
202 if ((fd = ioctl (g->fd, VFIO_GROUP_GET_DEVICE_FD, (char *) s)) < 0)
204 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_DEVICE_FD) '%U'",
205 format_vlib_pci_addr, addr);
208 vec_reset_length (s);
218 linux_vfio_init (vlib_main_t * vm)
220 linux_vfio_main_t *lvm = &vfio_main;
223 fd = open ("/dev/vfio/vfio", O_RDWR);
225 /* check if iommu is available */
228 if (ioctl (fd, VFIO_GET_API_VERSION) != VFIO_API_VERSION)
235 if (ioctl (fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) == 1)
236 lvm->flags |= LINUX_VFIO_F_HAVE_IOMMU;
237 if (ioctl (fd, VFIO_CHECK_EXTENSION, VFIO_NOIOMMU_IOMMU) == 1)
238 lvm->flags |= LINUX_VFIO_F_HAVE_NOIOMMU;
242 lvm->iommu_pool_index_by_group = hash_create (0, sizeof (uword));
243 lvm->container_fd = fd;
248 * fd.io coding-style-patch-verification: ON
251 * eval: (c-set-style "gnu")