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 <vppinfra/linux/sysfs.h>
42 #include <vlib/vlib.h>
43 #include <vlib/pci/pci.h>
44 #include <vlib/unix/unix.h>
46 #include <sys/types.h>
50 #include <sys/ioctl.h>
52 #include <linux/ethtool.h>
53 #include <linux/sockios.h>
54 #include <linux/vfio.h>
55 #include <sys/eventfd.h>
57 static const char *sysfs_pci_dev_path = "/sys/bus/pci/devices";
58 static const char *sysfs_pci_drv_path = "/sys/bus/pci/drivers";
59 static char *sysfs_mod_vfio_noiommu =
60 "/sys/module/vfio/parameters/enable_unsafe_noiommu_mode";
72 LINUX_PCI_DEVICE_TYPE_UNKNOWN,
73 LINUX_PCI_DEVICE_TYPE_UIO,
74 LINUX_PCI_DEVICE_TYPE_VFIO,
75 } linux_pci_device_type_t;
79 linux_pci_device_type_t type;
80 vlib_pci_dev_handle_t handle;
83 /* Resource file descriptors. */
84 linux_pci_region_t *regions;
86 /* File descriptor for config space read/write. */
90 /* Device File descriptor */
93 /* Minor device for uio device. */
96 /* Index given by clib_file_add. */
99 /* Interrupt handler */
100 void (*interrupt_handler) (vlib_pci_dev_handle_t h);
105 } linux_pci_device_t;
112 } linux_pci_vfio_iommu_group_t;
114 /* Pool of PCI devices. */
117 vlib_main_t *vlib_main;
118 linux_pci_device_t *linux_pci_devices;
121 int vfio_container_fd;
124 /* pool of IOMMU groups */
125 linux_pci_vfio_iommu_group_t *iommu_groups;
127 /* iommu group pool index by group id hash */
128 uword *iommu_pool_index_by_group;
132 extern linux_pci_main_t linux_pci_main;
135 linux_pci_get_device (vlib_pci_dev_handle_t h)
137 linux_pci_main_t *lpm = &linux_pci_main;
138 return pool_elt_at_index (lpm->linux_pci_devices, h);
142 vlib_pci_get_private_data (vlib_pci_dev_handle_t h)
144 linux_pci_device_t *d = linux_pci_get_device (h);
145 return d->private_data;
149 vlib_pci_set_private_data (vlib_pci_dev_handle_t h, uword private_data)
151 linux_pci_device_t *d = linux_pci_get_device (h);
152 d->private_data = private_data;
156 vlib_pci_get_addr (vlib_pci_dev_handle_t h)
158 linux_pci_device_t *lpm = linux_pci_get_device (h);
162 /* Call to allocate/initialize the pci subsystem.
163 This is not an init function so that users can explicitly enable
164 pci only when it's needed. */
165 clib_error_t *pci_bus_init (vlib_main_t * vm);
167 linux_pci_main_t linux_pci_main;
169 vlib_pci_device_info_t *
170 vlib_pci_get_device_info (vlib_pci_addr_t * addr, clib_error_t ** error)
172 linux_pci_main_t *lpm = &linux_pci_main;
174 vlib_pci_device_info_t *di;
179 di = clib_mem_alloc (sizeof (vlib_pci_device_info_t));
180 memset (di, 0, sizeof (vlib_pci_device_info_t));
181 di->addr.as_u32 = addr->as_u32;
183 u8 *dev_dir_name = format (0, "%s/%U", sysfs_pci_dev_path,
184 format_vlib_pci_addr, addr);
186 f = format (0, "%v/config%c", dev_dir_name, 0);
187 fd = open ((char *) f, O_RDWR);
189 /* Try read-only access if write fails. */
191 fd = open ((char *) f, O_RDONLY);
195 err = clib_error_return_unix (0, "open `%s'", f);
199 /* You can only read more that 64 bytes of config space as root; so we try to
200 read the full space but fall back to just the first 64 bytes. */
201 if (read (fd, &di->config_data, sizeof (di->config_data)) <
202 sizeof (di->config0))
204 err = clib_error_return_unix (0, "read `%s'", f);
210 static pci_config_header_t all_ones;
211 if (all_ones.vendor_id == 0)
212 memset (&all_ones, ~0, sizeof (all_ones));
214 if (!memcmp (&di->config0.header, &all_ones, sizeof (all_ones)))
216 err = clib_error_return (0, "invalid PCI config for `%s'", f);
222 if (di->config0.header.header_type == 0)
223 pci_config_type0_little_to_host (&di->config0);
225 pci_config_type1_little_to_host (&di->config1);
228 vec_reset_length (f);
229 f = format (f, "%v/numa_node%c", dev_dir_name, 0);
230 err = clib_sysfs_read ((char *) f, "%u", &di->numa_node);
234 clib_error_free (err);
237 vec_reset_length (f);
238 f = format (f, "%v/class%c", dev_dir_name, 0);
239 err = clib_sysfs_read ((char *) f, "0x%x", &tmp);
242 di->device_class = tmp >> 8;
244 vec_reset_length (f);
245 f = format (f, "%v/vendor%c", dev_dir_name, 0);
246 err = clib_sysfs_read ((char *) f, "0x%x", &tmp);
251 vec_reset_length (f);
252 f = format (f, "%v/device%c", dev_dir_name, 0);
253 err = clib_sysfs_read ((char *) f, "0x%x", &tmp);
258 vec_reset_length (f);
259 f = format (f, "%v/driver%c", dev_dir_name, 0);
260 di->driver_name = clib_sysfs_link_to_name ((char *) f);
262 di->iommu_group = -1;
263 if (lpm->vfio_container_fd != -1)
266 vec_reset_length (f);
267 f = format (f, "%v/iommu_group%c", dev_dir_name, 0);
268 tmpstr = clib_sysfs_link_to_name ((char *) f);
271 di->iommu_group = atoi ((char *) tmpstr);
278 vec_reset_length (f);
279 f = format (f, "%v/vpd%c", dev_dir_name, 0);
280 fd = open ((char *) f, O_RDONLY);
289 if (read (fd, &tag, 3) != 3)
292 if (tag[0] != 0x82 && tag[0] != 0x90 && tag[0] != 0x91)
295 len = (tag[2] << 8) | tag[1];
296 vec_validate (data, len);
298 if (read (fd, data, len) != len)
304 di->product_name = data;
305 else if (tag[0] == 0x90)
307 else if (tag[0] == 0x91)
318 vlib_pci_free_device_info (di);
323 vec_free (dev_dir_name);
327 clib_error_free (err);
332 directory_exists (char *path)
334 struct stat s = { 0 };
335 if (stat (path, &s) == -1)
338 return S_ISDIR (s.st_mode);
342 vlib_pci_bind_to_uio (vlib_pci_addr_t * addr, char *uio_drv_name)
344 clib_error_t *error = 0;
345 u8 *s = 0, *driver_name = 0;
348 vlib_pci_device_info_t *di;
349 int fd, clear_driver_override = 0;
350 u8 *dev_dir_name = format (0, "%s/%U", sysfs_pci_dev_path,
351 format_vlib_pci_addr, addr);
353 di = vlib_pci_get_device_info (addr, &error);
358 if (strncmp ("auto", uio_drv_name, 5) == 0)
360 int vfio_pci_loaded = 0;
362 if (directory_exists ("/sys/module/vfio_pci"))
365 if (di->iommu_group != -1)
367 /* device is bound to IOMMU group */
368 if (!vfio_pci_loaded)
370 error = clib_error_return (0, "Skipping PCI device %U: device "
371 "is bound to IOMMU group and "
372 "vfio-pci driver is not loaded",
373 format_vlib_pci_addr, addr);
377 uio_drv_name = "vfio-pci";
381 /* device is not bound to IOMMU group so we have multiple options */
382 if (vfio_pci_loaded &&
383 (error = clib_sysfs_write (sysfs_mod_vfio_noiommu, "Y")) == 0)
384 uio_drv_name = "vfio-pci";
385 else if (directory_exists ("/sys/module/uio_pci_generic"))
386 uio_drv_name = "uio_pci_generic";
387 else if (directory_exists ("/sys/module/igb_uio"))
388 uio_drv_name = "igb_uio";
391 clib_error_free (error);
392 error = clib_error_return (0, "Skipping PCI device %U: missing "
393 "kernel VFIO or UIO driver",
394 format_vlib_pci_addr, addr);
397 clib_error_free (error);
401 s = format (s, "%v/driver%c", dev_dir_name, 0);
402 driver_name = clib_sysfs_link_to_name ((char *) s);
403 vec_reset_length (s);
406 ((strcmp ("vfio-pci", (char *) driver_name) == 0) ||
407 (strcmp ("uio_pci_generic", (char *) driver_name) == 0) ||
408 (strcmp ("igb_uio", (char *) driver_name) == 0)))
411 /* walk trough all linux interfaces and if interface belonging to
412 this device is founf check if interface is admin up */
413 dir = opendir ("/sys/class/net");
414 s = format (s, "%U%c", format_vlib_pci_addr, addr, 0);
418 error = clib_error_return (0, "Skipping PCI device %U: failed to "
419 "read /sys/class/net",
420 format_vlib_pci_addr, addr);
424 fd = socket (PF_INET, SOCK_DGRAM, 0);
427 error = clib_error_return_unix (0, "socket");
431 while ((e = readdir (dir)))
434 struct ethtool_drvinfo drvinfo;
436 if (e->d_name[0] == '.') /* skip . and .. */
439 memset (&ifr, 0, sizeof ifr);
440 memset (&drvinfo, 0, sizeof drvinfo);
441 ifr.ifr_data = (char *) &drvinfo;
442 strncpy (ifr.ifr_name, e->d_name, IFNAMSIZ - 1);
443 drvinfo.cmd = ETHTOOL_GDRVINFO;
444 if (ioctl (fd, SIOCETHTOOL, &ifr) < 0)
446 /* Some interfaces (eg "lo") don't support this ioctl */
447 if ((errno != ENOTSUP) && (errno != ENODEV))
448 clib_unix_warning ("ioctl fetch intf %s bus info error",
453 if (strcmp ((char *) s, drvinfo.bus_info))
456 memset (&ifr, 0, sizeof (ifr));
457 strncpy (ifr.ifr_name, e->d_name, IFNAMSIZ - 1);
458 if (ioctl (fd, SIOCGIFFLAGS, &ifr) < 0)
460 error = clib_error_return_unix (0, "ioctl fetch intf %s flags",
466 if (ifr.ifr_flags & IFF_UP)
468 error = clib_error_return (0, "Skipping PCI device %U as host "
469 "interface %s is up",
470 format_vlib_pci_addr, addr, e->d_name);
477 vec_reset_length (s);
479 s = format (s, "%v/driver/unbind%c", dev_dir_name, 0);
480 clib_sysfs_write ((char *) s, "%U", format_vlib_pci_addr, addr);
481 vec_reset_length (s);
483 s = format (s, "%v/driver_override%c", dev_dir_name, 0);
484 if (access ((char *) s, F_OK) == 0)
486 clib_sysfs_write ((char *) s, "%s", uio_drv_name);
487 clear_driver_override = 1;
491 vec_reset_length (s);
492 s = format (s, "%s/%s/new_id%c", sysfs_pci_drv_path, uio_drv_name, 0);
493 clib_sysfs_write ((char *) s, "0x%04x 0x%04x", di->vendor_id,
496 vec_reset_length (s);
498 s = format (s, "%s/%s/bind%c", sysfs_pci_drv_path, uio_drv_name, 0);
499 clib_sysfs_write ((char *) s, "%U", format_vlib_pci_addr, addr);
500 vec_reset_length (s);
502 if (clear_driver_override)
504 s = format (s, "%v/driver_override%c", dev_dir_name, 0);
505 clib_sysfs_write ((char *) s, "%c", 0);
506 vec_reset_length (s);
512 vec_free (dev_dir_name);
513 vec_free (driver_name);
518 static clib_error_t *
519 scan_uio_dir (void *arg, u8 * path_name, u8 * file_name)
521 linux_pci_device_t *l = arg;
522 unformat_input_t input;
524 unformat_init_string (&input, (char *) file_name, vec_len (file_name));
526 if (!unformat (&input, "uio%d", &l->uio_minor))
529 unformat_free (&input);
533 static clib_error_t *
534 linux_pci_uio_read_ready (clib_file_t * uf)
536 int __attribute__ ((unused)) rv;
537 vlib_pci_dev_handle_t h = uf->private_data;
538 linux_pci_device_t *p = linux_pci_get_device (h);
541 rv = read (uf->file_descriptor, &icount, 4);
543 if (p->interrupt_handler)
544 p->interrupt_handler (h);
546 vlib_pci_intr_enable (h);
548 return /* no error */ 0;
551 static clib_error_t *
552 linux_pci_vfio_unmask_intx (linux_pci_device_t * d)
554 clib_error_t *err = 0;
555 struct vfio_irq_set i = {
556 .argsz = sizeof (struct vfio_irq_set),
559 .index = VFIO_PCI_INTX_IRQ_INDEX,
560 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
563 if (ioctl (d->fd, VFIO_DEVICE_SET_IRQS, &i) < 0)
565 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_SET_IRQS) '%U'",
566 format_vlib_pci_addr, &d->addr);
571 static clib_error_t *
572 linux_pci_uio_error_ready (clib_file_t * uf)
574 u32 error_index = (u32) uf->private_data;
576 return clib_error_return (0, "pci device %d: error", error_index);
579 static clib_error_t *
580 linux_pci_vfio_read_ready (clib_file_t * uf)
582 int __attribute__ ((unused)) rv;
583 vlib_pci_dev_handle_t h = uf->private_data;
584 linux_pci_device_t *p = linux_pci_get_device (h);
587 rv = read (uf->file_descriptor, &icount, sizeof (icount));
589 if (p->interrupt_handler)
590 p->interrupt_handler (h);
592 linux_pci_vfio_unmask_intx (p);
594 return /* no error */ 0;
597 static clib_error_t *
598 linux_pci_vfio_error_ready (clib_file_t * uf)
600 u32 error_index = (u32) uf->private_data;
602 return clib_error_return (0, "pci device %d: error", error_index);
605 static clib_error_t *
606 add_device_uio (vlib_main_t * vm, linux_pci_device_t * p,
607 vlib_pci_device_info_t * di, pci_device_registration_t * r)
609 clib_error_t *err = 0;
610 clib_file_t t = { 0 };
613 p->addr.as_u32 = di->addr.as_u32;
615 p->type = LINUX_PCI_DEVICE_TYPE_UIO;
617 s = format (s, "%s/%U/config%c", sysfs_pci_dev_path,
618 format_vlib_pci_addr, &di->addr, 0);
620 p->config_fd = open ((char *) s, O_RDWR);
621 p->config_offset = 0;
622 vec_reset_length (s);
624 if (p->config_fd == -1)
626 err = clib_error_return_unix (0, "open '%s'", s);
630 s = format (0, "%s/%U/uio", sysfs_pci_dev_path,
631 format_vlib_pci_addr, &di->addr);
632 foreach_directory_file ((char *) s, scan_uio_dir, p, /* scan_dirs */
634 vec_reset_length (s);
636 s = format (s, "/dev/uio%d%c", p->uio_minor, 0);
637 p->fd = open ((char *) s, O_RDWR);
640 err = clib_error_return_unix (0, "open '%s'", s);
644 t.read_function = linux_pci_uio_read_ready;
645 t.file_descriptor = p->fd;
646 t.error_function = linux_pci_uio_error_ready;
647 t.private_data = p->handle;
649 p->clib_file_index = clib_file_add (&file_main, &t);
650 p->interrupt_handler = r->interrupt_handler;
651 err = r->init_function (vm, p->handle);
657 if (p->config_fd != -1)
658 close (p->config_fd);
665 static linux_pci_vfio_iommu_group_t *
666 get_vfio_iommu_group (int group)
668 linux_pci_main_t *lpm = &linux_pci_main;
671 p = hash_get (lpm->iommu_pool_index_by_group, group);
673 return p ? pool_elt_at_index (lpm->iommu_groups, p[0]) : 0;
676 static clib_error_t *
677 open_vfio_iommu_group (int group)
679 linux_pci_main_t *lpm = &linux_pci_main;
680 linux_pci_vfio_iommu_group_t *g;
681 clib_error_t *err = 0;
682 struct vfio_group_status group_status;
686 g = get_vfio_iommu_group (group);
692 s = format (s, "/dev/vfio/%u%c", group, 0);
693 fd = open ((char *) s, O_RDWR);
695 return clib_error_return_unix (0, "open '%s'", s);
697 group_status.argsz = sizeof (group_status);
698 if (ioctl (fd, VFIO_GROUP_GET_STATUS, &group_status) < 0)
700 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_STATUS) '%s'",
705 if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE))
707 err = clib_error_return (0, "iommu group %d is not viable (not all "
708 "devices in this group bound to vfio-pci)",
713 if (ioctl (fd, VFIO_GROUP_SET_CONTAINER, &lpm->vfio_container_fd) < 0)
715 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_SET_CONTAINER) '%s'",
720 if (lpm->vfio_iommu_mode == 0)
722 if (ioctl (lpm->vfio_container_fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU) <
725 err = clib_error_return_unix (0, "ioctl(VFIO_SET_IOMMU) "
729 lpm->vfio_iommu_mode = VFIO_TYPE1_IOMMU;
733 pool_get (lpm->iommu_groups, g);
736 hash_set (lpm->iommu_pool_index_by_group, group, g - lpm->iommu_groups);
744 static clib_error_t *
745 add_device_vfio (vlib_main_t * vm, linux_pci_device_t * p,
746 vlib_pci_device_info_t * di, pci_device_registration_t * r)
748 linux_pci_vfio_iommu_group_t *g;
749 struct vfio_device_info device_info = { 0 };
750 struct vfio_region_info reg = { 0 };
751 struct vfio_irq_info irq_info = { 0 };
752 clib_error_t *err = 0;
755 p->addr.as_u32 = di->addr.as_u32;
756 p->type = LINUX_PCI_DEVICE_TYPE_VFIO;
758 if (di->driver_name == 0 ||
759 (strcmp ("vfio-pci", (char *) di->driver_name) != 0))
760 return clib_error_return (0, "Device '%U' (iommu group %d) not bound to "
761 "vfio-pci", format_vlib_pci_addr, &di->addr,
764 if ((err = open_vfio_iommu_group (di->iommu_group)))
767 g = get_vfio_iommu_group (di->iommu_group);
769 s = format (s, "%U%c", format_vlib_pci_addr, &di->addr, 0);
770 if ((p->fd = ioctl (g->fd, VFIO_GROUP_GET_DEVICE_FD, (char *) s)) < 0)
772 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_DEVICE_FD) '%U'",
773 format_vlib_pci_addr, &di->addr);
776 vec_reset_length (s);
778 device_info.argsz = sizeof (device_info);
779 if (ioctl (p->fd, VFIO_DEVICE_GET_INFO, &device_info) < 0)
781 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_INFO) '%U'",
782 format_vlib_pci_addr, &di->addr);
786 irq_info.argsz = sizeof (struct vfio_irq_info);
787 irq_info.index = VFIO_PCI_INTX_IRQ_INDEX;
788 if (ioctl (p->fd, VFIO_DEVICE_GET_IRQ_INFO, &irq_info) < 0)
790 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_IRQ_INFO) "
791 "'%U'", format_vlib_pci_addr, &di->addr);
795 /* reset if device supports it */
796 if (device_info.flags & VFIO_DEVICE_FLAGS_RESET)
797 if (ioctl (p->fd, VFIO_DEVICE_RESET) < 0)
799 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_RESET) '%U'",
800 format_vlib_pci_addr, &di->addr);
804 if ((irq_info.flags & VFIO_IRQ_INFO_EVENTFD) && irq_info.count == 1)
806 u8 buf[sizeof (struct vfio_irq_set) + sizeof (int)] = { 0 };
807 struct vfio_irq_set *irq_set = (struct vfio_irq_set *) buf;
808 clib_file_t t = { 0 };
809 int efd = eventfd (0, EFD_NONBLOCK);
811 irq_set->argsz = sizeof (buf);
813 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
815 VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
816 clib_memcpy (&irq_set->data, &efd, sizeof (int));
818 if (ioctl (p->fd, VFIO_DEVICE_SET_IRQS, irq_set) < 0)
820 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_SET_IRQS) '%U'",
821 format_vlib_pci_addr, &di->addr);
825 t.read_function = linux_pci_vfio_read_ready;
826 t.file_descriptor = efd;
827 t.error_function = linux_pci_vfio_error_ready;
828 t.private_data = p->handle;
829 p->clib_file_index = clib_file_add (&file_main, &t);
831 /* unmask the interrupt */
832 linux_pci_vfio_unmask_intx (p);
835 p->interrupt_handler = r->interrupt_handler;
837 reg.argsz = sizeof (struct vfio_region_info);
838 reg.index = VFIO_PCI_CONFIG_REGION_INDEX;
839 if (ioctl (p->fd, VFIO_DEVICE_GET_REGION_INFO, ®) < 0)
841 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_REGION_INFO) "
842 "'%U'", format_vlib_pci_addr, &di->addr);
845 p->config_offset = reg.offset;
846 p->config_fd = p->fd;
848 err = r->init_function (vm, p->handle);
856 if (p->config_fd != -1)
857 close (p->config_fd);
862 /* Configuration space read/write. */
864 vlib_pci_read_write_config (vlib_pci_dev_handle_t h,
865 vlib_read_or_write_t read_or_write,
866 uword address, void *data, u32 n_bytes)
868 linux_pci_device_t *p = linux_pci_get_device (h);
871 if (read_or_write == VLIB_READ)
872 n = pread (p->config_fd, data, n_bytes, p->config_offset + address);
874 n = pwrite (p->config_fd, data, n_bytes, p->config_offset + address);
877 return clib_error_return_unix (0, "%s",
878 read_or_write == VLIB_READ
884 static clib_error_t *
885 vlib_pci_map_region_int (vlib_pci_dev_handle_t h,
886 u32 bar, u8 * addr, void **result)
888 linux_pci_device_t *p = linux_pci_get_device (h);
891 int flags = MAP_SHARED;
892 u64 size = 0, offset = 0;
898 if (p->type == LINUX_PCI_DEVICE_TYPE_UIO)
901 struct stat stat_buf;
902 file_name = format (0, "%s/%U/resource%d%c", sysfs_pci_dev_path,
903 format_vlib_pci_addr, &p->addr, bar, 0);
905 fd = open ((char *) file_name, O_RDWR);
908 error = clib_error_return_unix (0, "open `%s'", file_name);
909 vec_free (file_name);
913 if (fstat (fd, &stat_buf) < 0)
915 error = clib_error_return_unix (0, "fstat `%s'", file_name);
916 vec_free (file_name);
921 vec_free (file_name);
924 size = stat_buf.st_size;
927 else if (p->type == LINUX_PCI_DEVICE_TYPE_VFIO)
929 struct vfio_region_info reg = { 0 };
930 reg.argsz = sizeof (struct vfio_region_info);
932 if (ioctl (p->fd, VFIO_DEVICE_GET_REGION_INFO, ®) < 0)
933 return clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_INFO) "
934 "'%U'", format_vlib_pci_addr,
943 *result = mmap (addr, size, PROT_READ | PROT_WRITE, flags, fd, offset);
944 if (*result == (void *) -1)
946 error = clib_error_return_unix (0, "mmap `BAR%u'", bar);
947 if (p->type == LINUX_PCI_DEVICE_TYPE_UIO)
953 vec_validate_init_empty (p->regions, bar,
954 (linux_pci_region_t) { .fd = -1});
956 if (p->type == LINUX_PCI_DEVICE_TYPE_UIO)
957 p->regions[bar].fd = fd;
958 p->regions[bar].addr = *result;
959 p->regions[bar].size = size;
964 vlib_pci_map_region (vlib_pci_dev_handle_t h, u32 resource, void **result)
966 return (vlib_pci_map_region_int (h, resource, 0 /* addr */ , result));
970 vlib_pci_map_region_fixed (vlib_pci_dev_handle_t h, u32 resource, u8 * addr,
973 return (vlib_pci_map_region_int (h, resource, addr, result));
977 init_device_from_registered (vlib_main_t * vm, vlib_pci_device_info_t * di)
979 vlib_pci_main_t *pm = &pci_main;
980 linux_pci_main_t *lpm = &linux_pci_main;
981 pci_device_registration_t *r;
983 clib_error_t *err = 0;
984 linux_pci_device_t *p;
986 pool_get (lpm->linux_pci_devices, p);
987 p->handle = p - lpm->linux_pci_devices;
989 r = pm->pci_device_registrations;
993 for (i = r->supported_devices; i->vendor_id != 0; i++)
994 if (i->vendor_id == di->vendor_id && i->device_id == di->device_id)
996 if (di->iommu_group != -1)
997 err = add_device_vfio (vm, p, di, r);
999 err = add_device_uio (vm, p, di, r);
1002 clib_error_report (err);
1006 r = r->next_registration;
1009 /* No driver, close the PCI config-space FD */
1010 memset (p, 0, sizeof (linux_pci_device_t));
1011 pool_put (lpm->linux_pci_devices, p);
1014 static clib_error_t *
1015 scan_pci_addr (void *arg, u8 * dev_dir_name, u8 * ignored)
1017 vlib_pci_addr_t addr, **addrv = arg;
1018 unformat_input_t input;
1019 clib_error_t *err = 0;
1021 unformat_init_string (&input, (char *) dev_dir_name,
1022 vec_len (dev_dir_name));
1024 if (!unformat (&input, "/sys/bus/pci/devices/%U",
1025 unformat_vlib_pci_addr, &addr))
1026 err = clib_error_return (0, "unformat error `%v`", dev_dir_name);
1028 unformat_free (&input);
1033 vec_add1 (*addrv, addr);
1038 pci_addr_cmp (void *v1, void *v2)
1040 vlib_pci_addr_t *a1 = v1;
1041 vlib_pci_addr_t *a2 = v2;
1043 if (a1->domain > a2->domain)
1045 if (a1->domain < a2->domain)
1047 if (a1->bus > a2->bus)
1049 if (a1->bus < a2->bus)
1051 if (a1->slot > a2->slot)
1053 if (a1->slot < a2->slot)
1055 if (a1->function > a2->function)
1057 if (a1->function < a2->function)
1063 vlib_pci_get_all_dev_addrs ()
1065 vlib_pci_addr_t *addrs = 0;
1067 err = foreach_directory_file ((char *) sysfs_pci_dev_path, scan_pci_addr,
1068 &addrs, /* scan_dirs */ 0);
1075 vec_sort_with_function (addrs, pci_addr_cmp);
1081 linux_pci_init (vlib_main_t * vm)
1083 vlib_pci_main_t *pm = &pci_main;
1084 linux_pci_main_t *lpm = &linux_pci_main;
1085 vlib_pci_addr_t *addr = 0, *addrs;
1086 clib_error_t *error;
1091 if ((error = vlib_call_init_function (vm, unix_input_init)))
1094 ASSERT (sizeof (vlib_pci_addr_t) == sizeof (u32));
1096 fd = open ("/dev/vfio/vfio", O_RDWR);
1098 if ((fd != -1) && (ioctl (fd, VFIO_GET_API_VERSION) != VFIO_API_VERSION))
1104 if ((fd != -1) && (ioctl (fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) == 0))
1110 lpm->vfio_container_fd = fd;
1111 lpm->iommu_pool_index_by_group = hash_create (0, sizeof (uword));
1113 addrs = vlib_pci_get_all_dev_addrs ();
1115 vec_foreach (addr, addrs)
1117 vlib_pci_device_info_t *d;
1118 if ((d = vlib_pci_get_device_info (addr, 0)))
1120 init_device_from_registered (vm, d);
1121 vlib_pci_free_device_info (d);
1129 VLIB_INIT_FUNCTION (linux_pci_init);
1132 * fd.io coding-style-patch-verification: ON
1135 * eval: (c-set-style "gnu")