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 vfio_map_regions (vlib_main_t * vm, int fd)
40 vlib_physmem_main_t *vpm = &physmem_main;
41 linux_vfio_main_t *lvm = &vfio_main;
42 vlib_physmem_region_t *pr;
43 struct vfio_iommu_type1_dma_map dm = { 0 };
46 dm.argsz = sizeof (struct vfio_iommu_type1_dma_map);
47 dm.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
50 pool_foreach (pr, vpm->regions,
52 vec_foreach_index (i, pr->page_table)
55 dm.vaddr = pointer_to_uword (pr->mem) + ((u64)i << pr->log2_page_size);
56 dm.size = 1ull << pr->log2_page_size;
58 vlib_log_debug (lvm->log_default, "map DMA va:0x%lx iova:%lx "
59 "size:0x%lx", dm.vaddr, dm.iova, dm.size);
61 if ((rv = ioctl (fd, VFIO_IOMMU_MAP_DMA, &dm)) &&
64 vlib_log_err (lvm->log_default, "map DMA va:0x%lx iova:%lx "
65 "size:0x%lx failed, error %s (errno %d)",
66 dm.vaddr, dm.iova, dm.size, strerror (errno),
77 linux_vfio_dma_map_regions (vlib_main_t * vm)
79 linux_vfio_main_t *lvm = &vfio_main;
81 if (lvm->container_fd != -1)
82 vfio_map_regions (vm, lvm->container_fd);
85 static linux_pci_vfio_iommu_group_t *
86 get_vfio_iommu_group (int group)
88 linux_vfio_main_t *lvm = &vfio_main;
91 p = hash_get (lvm->iommu_pool_index_by_group, group);
93 return p ? pool_elt_at_index (lvm->iommu_groups, p[0]) : 0;
97 open_vfio_iommu_group (int group, int is_noiommu)
99 linux_vfio_main_t *lvm = &vfio_main;
100 linux_pci_vfio_iommu_group_t *g;
101 clib_error_t *err = 0;
102 struct vfio_group_status group_status;
106 if (lvm->container_fd == -1)
108 if ((fd = open ("/dev/vfio/vfio", O_RDWR)) == -1)
109 return clib_error_return_unix (0, "failed to open VFIO container");
111 if (ioctl (fd, VFIO_GET_API_VERSION) != VFIO_API_VERSION)
114 return clib_error_return_unix (0, "incompatible VFIO version");
117 lvm->iommu_pool_index_by_group = hash_create (0, sizeof (uword));
118 lvm->container_fd = fd;
121 g = get_vfio_iommu_group (group);
127 s = format (s, "/dev/vfio/%s%u%c", is_noiommu ? "noiommu-" : "", group, 0);
128 fd = open ((char *) s, O_RDWR);
130 return clib_error_return_unix (0, "open '%s'", s);
132 group_status.argsz = sizeof (group_status);
133 if (ioctl (fd, VFIO_GROUP_GET_STATUS, &group_status) < 0)
135 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_STATUS) '%s'",
140 if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE))
142 err = clib_error_return (0, "iommu group %d is not viable (not all "
143 "devices in this group bound to vfio-pci)",
148 if (ioctl (fd, VFIO_GROUP_SET_CONTAINER, &lvm->container_fd) < 0)
150 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_SET_CONTAINER) '%s'",
155 if (lvm->iommu_mode == 0)
158 lvm->iommu_mode = VFIO_NOIOMMU_IOMMU;
160 lvm->iommu_mode = VFIO_TYPE1_IOMMU;
162 if (ioctl (lvm->container_fd, VFIO_SET_IOMMU, lvm->iommu_mode) < 0)
164 err = clib_error_return_unix (0, "ioctl(VFIO_SET_IOMMU) "
171 pool_get (lvm->iommu_groups, g);
174 hash_set (lvm->iommu_pool_index_by_group, group, g - lvm->iommu_groups);
183 linux_vfio_group_get_device_fd (vlib_pci_addr_t * addr, int *fdp,
186 clib_error_t *err = 0;
187 linux_pci_vfio_iommu_group_t *g;
194 s = format (s, "/sys/bus/pci/devices/%U/iommu_group", format_vlib_pci_addr,
196 tmpstr = clib_sysfs_link_to_name ((char *) s);
199 iommu_group = atoi ((char *) tmpstr);
204 err = clib_error_return (0, "Cannot find IOMMU group for PCI device ",
205 "'%U'", format_vlib_pci_addr, addr);
208 vec_reset_length (s);
210 s = format (s, "/sys/bus/pci/devices/%U/iommu_group/name",
211 format_vlib_pci_addr, addr);
212 err = clib_sysfs_read ((char *) s, "%s", &tmpstr);
215 if (strncmp ((char *) tmpstr, "vfio-noiommu", 12) == 0)
221 clib_error_free (err);
222 vec_reset_length (s);
223 if ((err = open_vfio_iommu_group (iommu_group, *is_noiommu)))
226 g = get_vfio_iommu_group (iommu_group);
228 s = format (s, "%U%c", format_vlib_pci_addr, addr, 0);
229 if ((fd = ioctl (g->fd, VFIO_GROUP_GET_DEVICE_FD, (char *) s)) < 0)
231 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_DEVICE_FD) '%U'",
232 format_vlib_pci_addr, addr);
235 vec_reset_length (s);
245 linux_vfio_init (vlib_main_t * vm)
247 linux_vfio_main_t *lvm = &vfio_main;
249 lvm->log_default = vlib_log_register_class ("vfio", 0);
250 lvm->container_fd = -1;
256 * fd.io coding-style-patch-verification: ON
259 * eval: (c-set-style "gnu")