FD.io VPP  v19.01.2-3-gf61a1a8
Vector Packet Processing
vfio.c
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1 /*
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:
6  *
7  * http://www.apache.org/licenses/LICENSE-2.0
8  *
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.
14  */
15 
16 #include <unistd.h>
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <fcntl.h>
20 #include <linux/vfio.h>
21 #include <sys/ioctl.h>
22 
23 #include <vppinfra/linux/sysfs.h>
24 
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>
30 
31 #ifndef VFIO_NOIOMMU_IOMMU
32 #define VFIO_NOIOMMU_IOMMU 8
33 #endif
34 
36 
39 {
42  struct vfio_iommu_type1_dma_map dm = { 0 };
43  uword log2_page_size = vpm->pmalloc_main->def_log2_page_sz;
44  uword physmem_start = pointer_to_uword (vpm->pmalloc_main->base);
45 
46  if (lvm->container_fd == -1)
47  return clib_error_return (0, "No cointainer fd");
48 
49  u32 page_index = vlib_physmem_get_page_index (vm, addr);
50 
51  if (clib_bitmap_get (lvm->physmem_pages_mapped, page_index))
52  {
53  vlib_log_debug (lvm->log_default, "map DMA va:%p page:%u already "
54  "mapped", addr, page_index);
55  return 0;
56  }
57 
58  dm.argsz = sizeof (struct vfio_iommu_type1_dma_map);
59  dm.flags = VFIO_DMA_MAP_FLAG_READ | VFIO_DMA_MAP_FLAG_WRITE;
60  dm.vaddr = physmem_start + (page_index << log2_page_size);
61  dm.size = 1ULL << log2_page_size;
62  dm.iova = dm.vaddr;
63  vlib_log_debug (lvm->log_default, "map DMA page:%u va:0x%lx iova:%lx "
64  "size:0x%lx", page_index, dm.vaddr, dm.iova, dm.size);
65 
66  if (ioctl (lvm->container_fd, VFIO_IOMMU_MAP_DMA, &dm) == -1)
67  {
68  vlib_log_err (lvm->log_default, "map DMA page:%u va:0x%lx iova:%lx "
69  "size:0x%lx failed, error %s (errno %d)", page_index,
70  dm.vaddr, dm.iova, dm.size, strerror (errno), errno);
71  return clib_error_return_unix (0, "physmem DMA map failed");
72  }
73 
75  page_index, 1);
76  return 0;
77 }
78 
81 {
83  uword *p;
84 
85  p = hash_get (lvm->iommu_pool_index_by_group, group);
86 
87  return p ? pool_elt_at_index (lvm->iommu_groups, p[0]) : 0;
88 }
89 
90 static clib_error_t *
91 open_vfio_iommu_group (int group, int is_noiommu)
92 {
95  clib_error_t *err = 0;
96  struct vfio_group_status group_status;
97  u8 *s = 0;
98  int fd;
99 
100  if (lvm->container_fd == -1)
101  {
102  if ((fd = open ("/dev/vfio/vfio", O_RDWR)) == -1)
103  return clib_error_return_unix (0, "failed to open VFIO container");
104 
105  if (ioctl (fd, VFIO_GET_API_VERSION) != VFIO_API_VERSION)
106  {
107  close (fd);
108  return clib_error_return_unix (0, "incompatible VFIO version");
109  }
110 
111  lvm->iommu_pool_index_by_group = hash_create (0, sizeof (uword));
112  lvm->container_fd = fd;
113  }
114 
115  g = get_vfio_iommu_group (group);
116  if (g)
117  {
118  g->refcnt++;
119  return 0;
120  }
121  s = format (s, "/dev/vfio/%s%u%c", is_noiommu ? "noiommu-" : "", group, 0);
122  fd = open ((char *) s, O_RDWR);
123  if (fd < 0)
124  return clib_error_return_unix (0, "open '%s'", s);
125 
126  group_status.argsz = sizeof (group_status);
127  if (ioctl (fd, VFIO_GROUP_GET_STATUS, &group_status) < 0)
128  {
129  err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_STATUS) '%s'",
130  s);
131  goto error;
132  }
133 
134  if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE))
135  {
136  err = clib_error_return (0, "iommu group %d is not viable (not all "
137  "devices in this group bound to vfio-pci)",
138  group);
139  goto error;
140  }
141 
142  if (ioctl (fd, VFIO_GROUP_SET_CONTAINER, &lvm->container_fd) < 0)
143  {
144  err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_SET_CONTAINER) '%s'",
145  s);
146  goto error;
147  }
148 
149  if (lvm->iommu_mode == 0)
150  {
151  if (is_noiommu)
153  else
154  lvm->iommu_mode = VFIO_TYPE1_IOMMU;
155 
156  if (ioctl (lvm->container_fd, VFIO_SET_IOMMU, lvm->iommu_mode) < 0)
157  {
158  err = clib_error_return_unix (0, "ioctl(VFIO_SET_IOMMU) "
159  "'/dev/vfio/vfio'");
160  goto error;
161  }
162  }
163 
164 
165  pool_get (lvm->iommu_groups, g);
166  g->fd = fd;
167  g->refcnt = 1;
168  hash_set (lvm->iommu_pool_index_by_group, group, g - lvm->iommu_groups);
169  vec_free (s);
170  return 0;
171 error:
172  close (fd);
173  return err;
174 }
175 
176 clib_error_t *
177 linux_vfio_group_get_device_fd (vlib_pci_addr_t * addr, int *fdp,
178  int *is_noiommu)
179 {
180  clib_error_t *err = 0;
182  u8 *s = 0;
183  int iommu_group;
184  u8 *tmpstr;
185  int fd;
186 
187  *is_noiommu = 0;
188  s = format (s, "/sys/bus/pci/devices/%U/iommu_group", format_vlib_pci_addr,
189  addr);
190  tmpstr = clib_sysfs_link_to_name ((char *) s);
191  if (tmpstr)
192  {
193  iommu_group = atoi ((char *) tmpstr);
194  vec_free (tmpstr);
195  }
196  else
197  {
198  err = clib_error_return (0, "Cannot find IOMMU group for PCI device ",
199  "'%U'", format_vlib_pci_addr, addr);
200  goto error;
201  }
202  vec_reset_length (s);
203 
204  s = format (s, "/sys/bus/pci/devices/%U/iommu_group/name",
205  format_vlib_pci_addr, addr);
206  err = clib_sysfs_read ((char *) s, "%s", &tmpstr);
207  if (err == 0)
208  {
209  if (strncmp ((char *) tmpstr, "vfio-noiommu", 12) == 0)
210  *is_noiommu = 1;
211 
212  vec_free (tmpstr);
213  }
214  else
215  clib_error_free (err);
216  vec_reset_length (s);
217  if ((err = open_vfio_iommu_group (iommu_group, *is_noiommu)))
218  return err;
219 
220  g = get_vfio_iommu_group (iommu_group);
221 
222  s = format (s, "%U%c", format_vlib_pci_addr, addr, 0);
223  if ((fd = ioctl (g->fd, VFIO_GROUP_GET_DEVICE_FD, (char *) s)) < 0)
224  {
225  err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_DEVICE_FD) '%U'",
226  format_vlib_pci_addr, addr);
227  goto error;
228  }
229  vec_reset_length (s);
230 
231  *fdp = fd;
232 
233 error:
234  vec_free (s);
235  return err;
236 }
237 
238 clib_error_t *
240 {
242 
243  lvm->log_default = vlib_log_register_class ("vfio", 0);
244  lvm->container_fd = -1;
245 
246  return 0;
247 }
248 
249 /*
250  * fd.io coding-style-patch-verification: ON
251  *
252  * Local Variables:
253  * eval: (c-set-style "gnu")
254  * End:
255  */
vlib_log_class_t vlib_log_register_class(char *class, char *subclass)
Definition: log.c:227
format_function_t format_vlib_pci_addr
Definition: pci.h:321
#define hash_set(h, key, value)
Definition: hash.h:255
vlib_physmem_main_t physmem_main
Definition: main.h:126
static linux_pci_vfio_iommu_group_t * get_vfio_iommu_group(int group)
Definition: vfio.c:80
static uword * clib_bitmap_set(uword *ai, uword i, uword value)
Sets the ith bit of a bitmap to new_value Removes trailing zeros from the bitmap. ...
Definition: bitmap.h:167
u8 * format(u8 *s, const char *fmt,...)
Definition: format.c:419
int iommu_mode
Definition: vfio.h:31
vlib_log_class_t log_default
Definition: vfio.h:42
#define pool_get(P, E)
Allocate an object E from a pool P (unspecified alignment).
Definition: pool.h:236
vhost_vring_addr_t addr
Definition: vhost_user.h:121
unsigned char u8
Definition: types.h:56
#define vec_reset_length(v)
Reset vector length to zero NULL-pointer tolerant.
clib_pmalloc_main_t * pmalloc_main
Definition: physmem.h:63
linux_pci_vfio_iommu_group_t * iommu_groups
Definition: vfio.h:34
#define clib_error_return(e, args...)
Definition: error.h:99
unsigned int u32
Definition: types.h:88
clib_error_t * linux_vfio_group_get_device_fd(vlib_pci_addr_t *addr, int *fdp, int *is_noiommu)
Definition: vfio.c:177
#define vlib_log_debug(...)
Definition: log.h:54
#define hash_get(h, key)
Definition: hash.h:249
#define pool_elt_at_index(p, i)
Returns pointer to element at given index.
Definition: pool.h:511
#define clib_error_return_unix(e, args...)
Definition: error.h:102
#define VFIO_NOIOMMU_IOMMU
Definition: vfio.c:32
clib_error_t * linux_vfio_init(vlib_main_t *vm)
Definition: vfio.c:239
clib_error_t * clib_sysfs_read(char *file_name, char *fmt,...)
Definition: sysfs.c:50
vlib_main_t * vm
Definition: buffer.c:301
#define vec_free(V)
Free vector&#39;s memory (no header).
Definition: vec.h:341
static u64 vlib_physmem_get_page_index(vlib_main_t *vm, void *mem)
Definition: physmem_funcs.h:96
static uword clib_bitmap_get(uword *ai, uword i)
Gets the ith bit value from a bitmap.
Definition: bitmap.h:197
#define hash_create(elts, value_bytes)
Definition: hash.h:696
clib_bitmap_t * physmem_pages_mapped
Definition: vfio.h:39
clib_error_t * vfio_map_physmem_page(vlib_main_t *vm, void *addr)
Definition: vfio.c:38
uword * iommu_pool_index_by_group
Definition: vfio.h:37
static uword pointer_to_uword(const void *p)
Definition: types.h:131
u64 uword
Definition: types.h:112
#define clib_error_free(e)
Definition: error.h:86
int container_fd
Definition: vfio.h:28
#define vlib_log_err(...)
Definition: log.h:50
static clib_error_t * open_vfio_iommu_group(int group, int is_noiommu)
Definition: vfio.c:91
u8 * clib_sysfs_link_to_name(char *link)
Definition: sysfs.c:90
linux_vfio_main_t vfio_main
Definition: vfio.c:35