2 * Copyright (c) 2016 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.
16 * pci.c: Linux user space PCI bus management.
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vlib/vlib.h>
41 #include <vlib/pci/pci.h>
42 #include <vlib/unix/unix.h>
44 #include <sys/types.h>
48 #include <sys/ioctl.h>
50 #include <linux/ethtool.h>
51 #include <linux/sockios.h>
55 /* /sys/bus/pci/devices/... directory name for this device. */
58 /* Resource file descriptors. */
61 /* File descriptor for config space read/write. */
64 /* File descriptor for /dev/uio%d */
67 /* Minor device for uio device. */
70 /* Index given by unix_file_add. */
75 /* Pool of PCI devices. */
78 vlib_main_t *vlib_main;
79 linux_pci_device_t *linux_pci_devices;
82 extern linux_pci_main_t linux_pci_main;
84 /* Call to allocate/initialize the pci subsystem.
85 This is not an init function so that users can explicitly enable
86 pci only when it's needed. */
87 clib_error_t *pci_bus_init (vlib_main_t * vm);
89 clib_error_t *vlib_pci_bind_to_uio (vlib_pci_device_t * d,
90 char *uio_driver_name);
92 linux_pci_main_t linux_pci_main;
95 vlib_pci_bind_to_uio (vlib_pci_device_t * d, char *uio_driver_name)
97 clib_error_t *error = 0;
102 u8 *dev_dir_name = format (0, "/sys/bus/pci/devices/%U",
103 format_vlib_pci_addr, &d->bus_address);
105 /* if uio sub-directory exists, we are fine, device is
106 already bound to UIO driver */
107 s = format (s, "%v/uio%c", dev_dir_name, 0);
108 if (access ((char *) s, F_OK) == 0)
110 vec_reset_length (s);
112 s = format (s, "%v/iommu_group%c", dev_dir_name, 0);
113 if (access ((char *) s, F_OK) == 0)
115 vec_reset_length (s);
117 /* walk trough all linux interfaces and if interface belonging to
118 this device is founf check if interface is admin up */
119 dir = opendir ("/sys/class/net");
120 s = format (s, "%U%c", format_vlib_pci_addr, &d->bus_address, 0);
124 error = clib_error_return (0, "Skipping PCI device %U: failed to "
125 "read /sys/class/net",
126 format_vlib_pci_addr, &d->bus_address);
130 fd = socket (PF_INET, SOCK_DGRAM, 0);
133 error = clib_error_return_unix (0, "socket");
137 while ((e = readdir (dir)))
140 struct ethtool_drvinfo drvinfo;
142 if (e->d_name[0] == '.') /* skip . and .. */
145 memset (&ifr, 0, sizeof ifr);
146 memset (&drvinfo, 0, sizeof drvinfo);
147 ifr.ifr_data = (char *) &drvinfo;
148 strncpy (ifr.ifr_name, e->d_name, IFNAMSIZ - 1);
149 drvinfo.cmd = ETHTOOL_GDRVINFO;
150 if (ioctl (fd, SIOCETHTOOL, &ifr) < 0)
152 /* Some interfaces (eg "lo") don't support this ioctl */
153 if ((errno != ENOTSUP) && (errno != ENODEV))
154 clib_unix_warning ("ioctl fetch intf %s bus info error",
159 if (strcmp ((char *) s, drvinfo.bus_info))
162 memset (&ifr, 0, sizeof (ifr));
163 strncpy (ifr.ifr_name, e->d_name, IFNAMSIZ - 1);
164 if (ioctl (fd, SIOCGIFFLAGS, &ifr) < 0)
166 error = clib_error_return_unix (0, "ioctl fetch intf %s flags",
172 if (ifr.ifr_flags & IFF_UP)
174 error = clib_error_return (0, "Skipping PCI device %U as host "
175 "interface %s is up",
176 format_vlib_pci_addr, &d->bus_address,
184 vec_reset_length (s);
186 s = format (s, "%v/driver/unbind%c", dev_dir_name, 0);
187 vlib_sysfs_write ((char *) s, "%U", format_vlib_pci_addr, &d->bus_address);
188 vec_reset_length (s);
190 s = format (s, "/sys/bus/pci/drivers/%s/new_id%c", uio_driver_name, 0);
191 vlib_sysfs_write ((char *) s, "0x%04x 0x%04x", d->vendor_id, d->device_id);
192 vec_reset_length (s);
194 s = format (s, "/sys/bus/pci/drivers/%s/bind%c", uio_driver_name, 0);
195 vlib_sysfs_write ((char *) s, "%U", format_vlib_pci_addr, &d->bus_address);
200 vec_free (dev_dir_name);
205 static clib_error_t *
206 scan_uio_dir (void *arg, u8 * path_name, u8 * file_name)
208 linux_pci_device_t *l = arg;
209 unformat_input_t input;
211 unformat_init_string (&input, (char *) file_name, vec_len (file_name));
213 if (!unformat (&input, "uio%d", &l->uio_minor))
216 unformat_free (&input);
220 static clib_error_t *
221 linux_pci_uio_read_ready (unix_file_t * uf)
223 vlib_pci_main_t *pm = &pci_main;
224 vlib_pci_device_t *d;
225 int __attribute__ ((unused)) rv;
228 rv = read (uf->file_descriptor, &icount, 4);
230 d = pool_elt_at_index (pm->pci_devs, uf->private_data);
232 if (d->interrupt_handler)
233 d->interrupt_handler (d);
235 vlib_pci_intr_enable (d);
237 return /* no error */ 0;
240 static clib_error_t *
241 linux_pci_uio_error_ready (unix_file_t * uf)
243 u32 error_index = (u32) uf->private_data;
245 return clib_error_return (0, "pci device %d: error", error_index);
249 add_device (vlib_pci_device_t * dev, linux_pci_device_t * pdev)
251 vlib_pci_main_t *pm = &pci_main;
252 linux_pci_main_t *lpm = &linux_pci_main;
253 linux_pci_device_t *l;
255 pool_get (lpm->linux_pci_devices, l);
258 l->dev_dir_name = vec_dup (l->dev_dir_name);
260 dev->os_handle = l - lpm->linux_pci_devices;
263 u8 *uio_dir = format (0, "%s/uio", l->dev_dir_name);
264 foreach_directory_file ((char *) uio_dir, scan_uio_dir, l, /* scan_dirs */
270 char *uio_name = (char *) format (0, "/dev/uio%d%c", l->uio_minor, 0);
271 l->uio_fd = open (uio_name, O_RDWR);
273 clib_unix_error ("open `%s'", uio_name);
278 unix_file_t template = { 0 };
279 unix_main_t *um = &unix_main;
281 template.read_function = linux_pci_uio_read_ready;
282 template.file_descriptor = l->uio_fd;
283 template.error_function = linux_pci_uio_error_ready;
284 template.private_data = dev - pm->pci_devs;
286 l->unix_file_index = unix_file_add (um, &template);
291 linux_pci_device_free (linux_pci_device_t * l)
294 for (i = 0; i < vec_len (l->resource_fds); i++)
295 if (l->resource_fds[i] > 0)
296 close (l->resource_fds[i]);
297 if (l->config_fd > 0)
298 close (l->config_fd);
301 vec_free (l->resource_fds);
302 vec_free (l->dev_dir_name);
305 /* Configuration space read/write. */
307 vlib_pci_read_write_config (vlib_pci_device_t * dev,
308 vlib_read_or_write_t read_or_write,
309 uword address, void *data, u32 n_bytes)
311 linux_pci_main_t *lpm = &linux_pci_main;
312 linux_pci_device_t *p;
315 p = pool_elt_at_index (lpm->linux_pci_devices, dev->os_handle);
317 if (read_or_write == VLIB_READ)
318 n = pread (p->config_fd, data, n_bytes, address);
320 n = pwrite (p->config_fd, data, n_bytes, address);
323 return clib_error_return_unix (0, "%s",
324 read_or_write == VLIB_READ
330 static clib_error_t *
331 os_map_pci_resource_internal (uword os_handle,
332 u32 resource, u8 * addr, void **result)
334 linux_pci_main_t *pm = &linux_pci_main;
335 linux_pci_device_t *p;
336 struct stat stat_buf;
340 int flags = MAP_SHARED;
343 p = pool_elt_at_index (pm->linux_pci_devices, os_handle);
345 file_name = format (0, "%v/resource%d%c", p->dev_dir_name, resource, 0);
346 fd = open ((char *) file_name, O_RDWR);
349 error = clib_error_return_unix (0, "open `%s'", file_name);
353 if (fstat (fd, &stat_buf) < 0)
355 error = clib_error_return_unix (0, "fstat `%s'", file_name);
359 vec_validate (p->resource_fds, resource);
360 p->resource_fds[resource] = fd;
364 *result = mmap (addr,
365 /* size */ stat_buf.st_size,
366 PROT_READ | PROT_WRITE, flags,
369 if (*result == (void *) -1)
371 error = clib_error_return_unix (0, "mmap `%s'", file_name);
381 vec_free (file_name);
386 vlib_pci_map_resource (vlib_pci_device_t * dev, u32 resource, void **result)
388 return (os_map_pci_resource_internal
389 (dev->os_handle, resource, 0 /* addr */ ,
394 vlib_pci_map_resource_fixed (vlib_pci_device_t * dev,
395 u32 resource, u8 * addr, void **result)
397 return (os_map_pci_resource_internal
398 (dev->os_handle, resource, addr, result));
402 vlib_pci_free_device (vlib_pci_device_t * dev)
404 linux_pci_main_t *pm = &linux_pci_main;
405 linux_pci_device_t *l;
407 l = pool_elt_at_index (pm->linux_pci_devices, dev->os_handle);
408 linux_pci_device_free (l);
409 pool_put (pm->linux_pci_devices, l);
412 pci_device_registration_t * __attribute__ ((unused))
413 pci_device_next_registered (pci_device_registration_t * r)
417 /* Null vendor id marks end of initialized list. */
418 for (i = 0; r->supported_devices[i].vendor_id != 0; i++)
421 return clib_elf_section_data_next (r, i * sizeof (r->supported_devices[0]));
424 static clib_error_t *
425 init_device_from_registered (vlib_main_t * vm,
426 vlib_pci_device_t * dev,
427 linux_pci_device_t * pdev)
429 vlib_pci_main_t *pm = &pci_main;
430 pci_device_registration_t *r;
434 r = pm->pci_device_registrations;
438 for (i = r->supported_devices; i->vendor_id != 0; i++)
439 if (i->vendor_id == dev->vendor_id && i->device_id == dev->device_id)
441 error = vlib_pci_bind_to_uio (dev, "uio_pci_generic");
444 clib_error_report (error);
448 add_device (dev, pdev);
449 dev->interrupt_handler = r->interrupt_handler;
450 return r->init_function (vm, dev);
452 r = r->next_registration;
454 /* No driver, close the PCI config-space FD */
455 close (pdev->config_fd);
459 static clib_error_t *
460 init_device (vlib_main_t * vm,
461 vlib_pci_device_t * dev, linux_pci_device_t * pdev)
463 return init_device_from_registered (vm, dev, pdev);
466 static clib_error_t *
467 scan_device (void *arg, u8 * dev_dir_name, u8 * ignored)
469 vlib_main_t *vm = arg;
470 vlib_pci_main_t *pm = &pci_main;
473 clib_error_t *error = 0;
474 vlib_pci_device_t *dev;
475 linux_pci_device_t pdev = { 0 };
478 f = format (0, "%v/config%c", dev_dir_name, 0);
479 fd = open ((char *) f, O_RDWR);
481 /* Try read-only access if write fails. */
483 fd = open ((char *) f, O_RDONLY);
487 error = clib_error_return_unix (0, "open `%s'", f);
491 pool_get (pm->pci_devs, dev);
493 /* You can only read more that 64 bytes of config space as root; so we try to
494 read the full space but fall back to just the first 64 bytes. */
495 if (read (fd, &dev->config_data, sizeof (dev->config_data)) !=
496 sizeof (dev->config_data)
497 && read (fd, &dev->config0,
498 sizeof (dev->config0)) != sizeof (dev->config0))
500 pool_put (pm->pci_devs, dev);
501 error = clib_error_return_unix (0, "read `%s'", f);
507 static pci_config_header_t all_ones;
508 if (all_ones.vendor_id == 0)
509 memset (&all_ones, ~0, sizeof (all_ones));
511 if (!memcmp (&dev->config0.header, &all_ones, sizeof (all_ones)))
513 pool_put (pm->pci_devs, dev);
514 error = clib_error_return (0, "invalid PCI config for `%s'", f);
520 if (dev->config0.header.header_type == 0)
521 pci_config_type0_little_to_host (&dev->config0);
523 pci_config_type1_little_to_host (&dev->config1);
525 /* Parse bus, dev, function from directory name. */
527 unformat_input_t input;
529 unformat_init_string (&input, (char *) dev_dir_name,
530 vec_len (dev_dir_name));
532 if (!unformat (&input, "/sys/bus/pci/devices/%U",
533 unformat_vlib_pci_addr, &dev->bus_address))
536 unformat_free (&input);
542 pdev.dev_dir_name = dev_dir_name;
544 hash_set (pm->pci_dev_index_by_pci_addr, dev->bus_address.as_u32,
547 error = init_device (vm, dev, &pdev);
549 vec_reset_length (f);
550 f = format (f, "%v/vpd%c", dev_dir_name, 0);
551 fd = open ((char *) f, O_RDONLY);
560 if (read (fd, &tag, 3) != 3)
563 if (tag[0] != 0x82 && tag[0] != 0x90 && tag[0] != 0x91)
566 len = (tag[2] << 8) | tag[1];
567 vec_validate (data, len);
569 if (read (fd, data, len) != len)
575 dev->product_name = data;
576 else if (tag[0] == 0x90)
578 else if (tag[0] == 0x91)
586 vec_reset_length (f);
587 f = format (f, "%v/driver%c", dev_dir_name, 0);
588 dev->driver_name = vlib_sysfs_link_to_name ((char *) f);
591 vec_reset_length (f);
592 f = format (f, "%v/numa_node%c", dev_dir_name, 0);
593 vlib_sysfs_read ((char *) f, "%u", &dev->numa_node);
595 vec_reset_length (f);
596 f = format (f, "%v/class%c", dev_dir_name, 0);
597 vlib_sysfs_read ((char *) f, "0x%x", &tmp);
598 dev->device_class = tmp >> 8;
600 vec_reset_length (f);
601 f = format (f, "%v/vendor%c", dev_dir_name, 0);
602 vlib_sysfs_read ((char *) f, "0x%x", &tmp);
603 dev->vendor_id = tmp;
605 vec_reset_length (f);
606 f = format (f, "%v/device%c", dev_dir_name, 0);
607 vlib_sysfs_read ((char *) f, "0x%x", &tmp);
608 dev->device_id = tmp;
616 linux_pci_init (vlib_main_t * vm)
618 vlib_pci_main_t *pm = &pci_main;
623 if ((error = vlib_call_init_function (vm, unix_input_init)))
626 ASSERT (sizeof (vlib_pci_addr_t) == sizeof (u32));
627 pm->pci_dev_index_by_pci_addr = hash_create (0, sizeof (uword));
629 error = foreach_directory_file ("/sys/bus/pci/devices", scan_device, vm,
632 /* Complain and continue. might not be root, etc. */
634 clib_error_report (error);
639 VLIB_INIT_FUNCTION (linux_pci_init);
642 * fd.io coding-style-patch-verification: ON
645 * eval: (c-set-style "gnu")