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";
75 pci_msix_handler_function_t *msix_handler;
81 LINUX_PCI_DEVICE_TYPE_UNKNOWN,
82 LINUX_PCI_DEVICE_TYPE_UIO,
83 LINUX_PCI_DEVICE_TYPE_VFIO,
84 } linux_pci_device_type_t;
88 linux_pci_device_type_t type;
89 vlib_pci_dev_handle_t handle;
92 /* Resource file descriptors. */
93 linux_pci_region_t *regions;
95 /* File descriptor for config space read/write. */
99 /* Device File descriptor */
102 /* Minor device for uio device. */
105 /* Index given by clib_file_add. */
108 /* Interrupt handler */
109 void (*interrupt_handler) (vlib_pci_dev_handle_t h);
110 linux_pci_irq_t *msix_irqs;
115 } linux_pci_device_t;
122 } linux_pci_vfio_iommu_group_t;
124 /* Pool of PCI devices. */
127 vlib_main_t *vlib_main;
128 linux_pci_device_t *linux_pci_devices;
131 int vfio_container_fd;
134 /* pool of IOMMU groups */
135 linux_pci_vfio_iommu_group_t *iommu_groups;
137 /* iommu group pool index by group id hash */
138 uword *iommu_pool_index_by_group;
142 extern linux_pci_main_t linux_pci_main;
144 static linux_pci_device_t *
145 linux_pci_get_device (vlib_pci_dev_handle_t h)
147 linux_pci_main_t *lpm = &linux_pci_main;
148 return pool_elt_at_index (lpm->linux_pci_devices, h);
152 vlib_pci_get_private_data (vlib_pci_dev_handle_t h)
154 linux_pci_device_t *d = linux_pci_get_device (h);
155 return d->private_data;
159 vlib_pci_set_private_data (vlib_pci_dev_handle_t h, uword private_data)
161 linux_pci_device_t *d = linux_pci_get_device (h);
162 d->private_data = private_data;
166 vlib_pci_get_addr (vlib_pci_dev_handle_t h)
168 linux_pci_device_t *d = linux_pci_get_device (h);
172 /* Call to allocate/initialize the pci subsystem.
173 This is not an init function so that users can explicitly enable
174 pci only when it's needed. */
175 clib_error_t *pci_bus_init (vlib_main_t * vm);
177 linux_pci_main_t linux_pci_main;
179 vlib_pci_device_info_t *
180 vlib_pci_get_device_info (vlib_pci_addr_t * addr, clib_error_t ** error)
182 linux_pci_main_t *lpm = &linux_pci_main;
184 vlib_pci_device_info_t *di;
189 di = clib_mem_alloc (sizeof (vlib_pci_device_info_t));
190 memset (di, 0, sizeof (vlib_pci_device_info_t));
191 di->addr.as_u32 = addr->as_u32;
193 u8 *dev_dir_name = format (0, "%s/%U", sysfs_pci_dev_path,
194 format_vlib_pci_addr, addr);
196 f = format (0, "%v/config%c", dev_dir_name, 0);
197 fd = open ((char *) f, O_RDWR);
199 /* Try read-only access if write fails. */
201 fd = open ((char *) f, O_RDONLY);
205 err = clib_error_return_unix (0, "open `%s'", f);
209 /* You can only read more that 64 bytes of config space as root; so we try to
210 read the full space but fall back to just the first 64 bytes. */
211 if (read (fd, &di->config_data, sizeof (di->config_data)) <
212 sizeof (di->config0))
214 err = clib_error_return_unix (0, "read `%s'", f);
220 static pci_config_header_t all_ones;
221 if (all_ones.vendor_id == 0)
222 memset (&all_ones, ~0, sizeof (all_ones));
224 if (!memcmp (&di->config0.header, &all_ones, sizeof (all_ones)))
226 err = clib_error_return (0, "invalid PCI config for `%s'", f);
232 if (di->config0.header.header_type == 0)
233 pci_config_type0_little_to_host (&di->config0);
235 pci_config_type1_little_to_host (&di->config1);
238 vec_reset_length (f);
239 f = format (f, "%v/numa_node%c", dev_dir_name, 0);
240 err = clib_sysfs_read ((char *) f, "%u", &di->numa_node);
244 clib_error_free (err);
247 vec_reset_length (f);
248 f = format (f, "%v/class%c", dev_dir_name, 0);
249 err = clib_sysfs_read ((char *) f, "0x%x", &tmp);
252 di->device_class = tmp >> 8;
254 vec_reset_length (f);
255 f = format (f, "%v/vendor%c", dev_dir_name, 0);
256 err = clib_sysfs_read ((char *) f, "0x%x", &tmp);
261 vec_reset_length (f);
262 f = format (f, "%v/device%c", dev_dir_name, 0);
263 err = clib_sysfs_read ((char *) f, "0x%x", &tmp);
268 vec_reset_length (f);
269 f = format (f, "%v/driver%c", dev_dir_name, 0);
270 di->driver_name = clib_sysfs_link_to_name ((char *) f);
272 di->iommu_group = -1;
273 if (lpm->vfio_container_fd != -1)
276 vec_reset_length (f);
277 f = format (f, "%v/iommu_group%c", dev_dir_name, 0);
278 tmpstr = clib_sysfs_link_to_name ((char *) f);
281 di->iommu_group = atoi ((char *) tmpstr);
288 vec_reset_length (f);
289 f = format (f, "%v/vpd%c", dev_dir_name, 0);
290 fd = open ((char *) f, O_RDONLY);
299 if (read (fd, &tag, 3) != 3)
302 if (tag[0] != 0x82 && tag[0] != 0x90 && tag[0] != 0x91)
305 len = (tag[2] << 8) | tag[1];
306 vec_validate (data, len);
308 if (read (fd, data, len) != len)
314 di->product_name = data;
315 else if (tag[0] == 0x90)
317 else if (tag[0] == 0x91)
328 vlib_pci_free_device_info (di);
333 vec_free (dev_dir_name);
337 clib_error_free (err);
342 directory_exists (char *path)
344 struct stat s = { 0 };
345 if (stat (path, &s) == -1)
348 return S_ISDIR (s.st_mode);
352 vlib_pci_bind_to_uio (vlib_pci_addr_t * addr, char *uio_drv_name)
354 clib_error_t *error = 0;
355 u8 *s = 0, *driver_name = 0;
358 vlib_pci_device_info_t *di;
359 int fd, clear_driver_override = 0;
360 u8 *dev_dir_name = format (0, "%s/%U", sysfs_pci_dev_path,
361 format_vlib_pci_addr, addr);
363 di = vlib_pci_get_device_info (addr, &error);
368 if (strncmp ("auto", uio_drv_name, 5) == 0)
370 int vfio_pci_loaded = 0;
372 if (directory_exists ("/sys/module/vfio_pci"))
375 if (di->iommu_group != -1)
377 /* device is bound to IOMMU group */
378 if (!vfio_pci_loaded)
380 error = clib_error_return (0, "Skipping PCI device %U: device "
381 "is bound to IOMMU group and "
382 "vfio-pci driver is not loaded",
383 format_vlib_pci_addr, addr);
387 uio_drv_name = "vfio-pci";
391 /* device is not bound to IOMMU group so we have multiple options */
392 if (vfio_pci_loaded &&
393 (error = clib_sysfs_write (sysfs_mod_vfio_noiommu, "Y")) == 0)
394 uio_drv_name = "vfio-pci";
395 else if (directory_exists ("/sys/module/uio_pci_generic"))
396 uio_drv_name = "uio_pci_generic";
397 else if (directory_exists ("/sys/module/igb_uio"))
398 uio_drv_name = "igb_uio";
401 clib_error_free (error);
402 error = clib_error_return (0, "Skipping PCI device %U: missing "
403 "kernel VFIO or UIO driver",
404 format_vlib_pci_addr, addr);
407 clib_error_free (error);
411 s = format (s, "%v/driver%c", dev_dir_name, 0);
412 driver_name = clib_sysfs_link_to_name ((char *) s);
413 vec_reset_length (s);
416 ((strcmp ("vfio-pci", (char *) driver_name) == 0) ||
417 (strcmp ("uio_pci_generic", (char *) driver_name) == 0) ||
418 (strcmp ("igb_uio", (char *) driver_name) == 0)))
421 /* walk trough all linux interfaces and if interface belonging to
422 this device is founf check if interface is admin up */
423 dir = opendir ("/sys/class/net");
424 s = format (s, "%U%c", format_vlib_pci_addr, addr, 0);
428 error = clib_error_return (0, "Skipping PCI device %U: failed to "
429 "read /sys/class/net",
430 format_vlib_pci_addr, addr);
434 fd = socket (PF_INET, SOCK_DGRAM, 0);
437 error = clib_error_return_unix (0, "socket");
441 while ((e = readdir (dir)))
444 struct ethtool_drvinfo drvinfo;
446 if (e->d_name[0] == '.') /* skip . and .. */
449 memset (&ifr, 0, sizeof ifr);
450 memset (&drvinfo, 0, sizeof drvinfo);
451 ifr.ifr_data = (char *) &drvinfo;
452 strncpy (ifr.ifr_name, e->d_name, IFNAMSIZ - 1);
453 drvinfo.cmd = ETHTOOL_GDRVINFO;
454 if (ioctl (fd, SIOCETHTOOL, &ifr) < 0)
456 /* Some interfaces (eg "lo") don't support this ioctl */
457 if ((errno != ENOTSUP) && (errno != ENODEV))
458 clib_unix_warning ("ioctl fetch intf %s bus info error",
463 if (strcmp ((char *) s, drvinfo.bus_info))
466 memset (&ifr, 0, sizeof (ifr));
467 strncpy (ifr.ifr_name, e->d_name, IFNAMSIZ - 1);
468 if (ioctl (fd, SIOCGIFFLAGS, &ifr) < 0)
470 error = clib_error_return_unix (0, "ioctl fetch intf %s flags",
476 if (ifr.ifr_flags & IFF_UP)
478 error = clib_error_return (0, "Skipping PCI device %U as host "
479 "interface %s is up",
480 format_vlib_pci_addr, addr, e->d_name);
487 vec_reset_length (s);
489 s = format (s, "%v/driver/unbind%c", dev_dir_name, 0);
490 clib_sysfs_write ((char *) s, "%U", format_vlib_pci_addr, addr);
491 vec_reset_length (s);
493 s = format (s, "%v/driver_override%c", dev_dir_name, 0);
494 if (access ((char *) s, F_OK) == 0)
496 clib_sysfs_write ((char *) s, "%s", uio_drv_name);
497 clear_driver_override = 1;
501 vec_reset_length (s);
502 s = format (s, "%s/%s/new_id%c", sysfs_pci_drv_path, uio_drv_name, 0);
503 clib_sysfs_write ((char *) s, "0x%04x 0x%04x", di->vendor_id,
506 vec_reset_length (s);
508 s = format (s, "%s/%s/bind%c", sysfs_pci_drv_path, uio_drv_name, 0);
509 clib_sysfs_write ((char *) s, "%U", format_vlib_pci_addr, addr);
510 vec_reset_length (s);
512 if (clear_driver_override)
514 s = format (s, "%v/driver_override%c", dev_dir_name, 0);
515 clib_sysfs_write ((char *) s, "%c", 0);
516 vec_reset_length (s);
522 vec_free (dev_dir_name);
523 vec_free (driver_name);
528 static clib_error_t *
529 scan_uio_dir (void *arg, u8 * path_name, u8 * file_name)
531 linux_pci_device_t *l = arg;
532 unformat_input_t input;
534 unformat_init_string (&input, (char *) file_name, vec_len (file_name));
536 if (!unformat (&input, "uio%d", &l->uio_minor))
539 unformat_free (&input);
543 static clib_error_t *
544 vfio_set_irqs (linux_pci_device_t * p, u32 index, u32 start, u32 count,
545 u32 flags, int *efds)
547 int data_len = efds ? count * sizeof (int) : 0;
548 u8 buf[sizeof (struct vfio_irq_set) + data_len];
549 struct vfio_irq_info irq_info = { 0 };
550 struct vfio_irq_set *irq_set = (struct vfio_irq_set *) buf;
553 irq_info.argsz = sizeof (struct vfio_irq_info);
554 irq_info.index = index;
556 if (ioctl (p->fd, VFIO_DEVICE_GET_IRQ_INFO, &irq_info) < 0)
557 return clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_IRQ_INFO) "
558 "'%U'", format_vlib_pci_addr, &p->addr);
560 if (irq_info.count < start + count)
561 return clib_error_return_unix (0, "vfio_set_irq: unexistng interrupt on "
562 "'%U'", format_vlib_pci_addr, &p->addr);
567 flags |= VFIO_IRQ_SET_DATA_EVENTFD;
568 clib_memcpy (&irq_set->data, efds, data_len);
571 flags |= VFIO_IRQ_SET_DATA_NONE;
573 ASSERT ((flags & (VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_DATA_EVENTFD)) !=
574 (VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_DATA_EVENTFD));
576 irq_set->argsz = sizeof (struct vfio_irq_set) + data_len;
577 irq_set->index = index;
578 irq_set->start = start;
579 irq_set->count = count;
580 irq_set->flags = flags;
582 if (ioctl (p->fd, VFIO_DEVICE_SET_IRQS, irq_set) < 0)
583 return clib_error_return_unix (0, "%U:ioctl(VFIO_DEVICE_SET_IRQS) "
584 "[index = %u, start = %u, count = %u, "
586 format_vlib_pci_addr, &p->addr,
587 index, start, count, flags);
591 static clib_error_t *
592 linux_pci_uio_read_ready (clib_file_t * uf)
594 int __attribute__ ((unused)) rv;
595 vlib_pci_dev_handle_t h = uf->private_data;
596 linux_pci_device_t *p = linux_pci_get_device (h);
599 rv = read (uf->file_descriptor, &icount, 4);
601 if (p->interrupt_handler)
602 p->interrupt_handler (h);
604 vlib_pci_intr_enable (h);
606 return /* no error */ 0;
609 static clib_error_t *
610 linux_pci_vfio_unmask_intx (linux_pci_device_t * d)
612 clib_error_t *err = 0;
613 struct vfio_irq_set i = {
614 .argsz = sizeof (struct vfio_irq_set),
617 .index = VFIO_PCI_INTX_IRQ_INDEX,
618 .flags = VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_ACTION_UNMASK,
621 if (ioctl (d->fd, VFIO_DEVICE_SET_IRQS, &i) < 0)
623 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_SET_IRQS) '%U'",
624 format_vlib_pci_addr, &d->addr);
630 vlib_pci_vfio_unmask_msix (vlib_pci_dev_handle_t h, u32 start, u32 count)
632 linux_pci_device_t *p = linux_pci_get_device (h);
633 return vfio_set_irqs (p, VFIO_PCI_MSIX_IRQ_INDEX, start, count,
634 VFIO_IRQ_SET_ACTION_UNMASK, 0);
637 static clib_error_t *
638 linux_pci_uio_error_ready (clib_file_t * uf)
640 u32 error_index = (u32) uf->private_data;
642 return clib_error_return (0, "pci device %d: error", error_index);
645 static clib_error_t *
646 linux_pci_vfio_msix_read_ready (clib_file_t * uf)
648 int __attribute__ ((unused)) rv;
649 vlib_pci_dev_handle_t h = uf->private_data >> 16;
650 u16 line = uf->private_data & 0xffff;
651 linux_pci_device_t *p = linux_pci_get_device (h);
652 linux_pci_irq_t *irq = vec_elt_at_index (p->msix_irqs, line);
655 rv = read (uf->file_descriptor, &icount, sizeof (icount));
657 if (irq->msix_handler)
658 irq->msix_handler (h, line);
660 return /* no error */ 0;
663 static clib_error_t *
664 linux_pci_vfio_intx_read_ready (clib_file_t * uf)
666 int __attribute__ ((unused)) rv;
667 vlib_pci_dev_handle_t h = uf->private_data;
668 linux_pci_device_t *p = linux_pci_get_device (h);
671 rv = read (uf->file_descriptor, &icount, sizeof (icount));
673 if (p->interrupt_handler)
674 p->interrupt_handler (h);
676 linux_pci_vfio_unmask_intx (p);
678 return /* no error */ 0;
681 static clib_error_t *
682 linux_pci_vfio_error_ready (clib_file_t * uf)
684 u32 error_index = (u32) uf->private_data;
686 return clib_error_return (0, "pci device %d: error", error_index);
689 static clib_error_t *
690 add_device_uio (vlib_main_t * vm, linux_pci_device_t * p,
691 vlib_pci_device_info_t * di, pci_device_registration_t * r)
693 clib_error_t *err = 0;
694 clib_file_t t = { 0 };
697 p->addr.as_u32 = di->addr.as_u32;
699 p->type = LINUX_PCI_DEVICE_TYPE_UIO;
701 s = format (s, "%s/%U/config%c", sysfs_pci_dev_path,
702 format_vlib_pci_addr, &di->addr, 0);
704 p->config_fd = open ((char *) s, O_RDWR);
705 p->config_offset = 0;
706 vec_reset_length (s);
708 if (p->config_fd == -1)
710 err = clib_error_return_unix (0, "open '%s'", s);
714 s = format (0, "%s/%U/uio", sysfs_pci_dev_path,
715 format_vlib_pci_addr, &di->addr);
716 foreach_directory_file ((char *) s, scan_uio_dir, p, /* scan_dirs */
718 vec_reset_length (s);
720 s = format (s, "/dev/uio%d%c", p->uio_minor, 0);
721 p->fd = open ((char *) s, O_RDWR);
724 err = clib_error_return_unix (0, "open '%s'", s);
728 t.read_function = linux_pci_uio_read_ready;
729 t.file_descriptor = p->fd;
730 t.error_function = linux_pci_uio_error_ready;
731 t.private_data = p->handle;
733 p->clib_file_index = clib_file_add (&file_main, &t);
734 p->interrupt_handler = r->interrupt_handler;
735 err = r->init_function (vm, p->handle);
741 if (p->config_fd != -1)
742 close (p->config_fd);
750 vlib_pci_register_msix_handler (vlib_pci_dev_handle_t h, u32 start, u32 count,
751 pci_msix_handler_function_t * msix_handler)
753 clib_error_t *err = 0;
754 linux_pci_device_t *p = linux_pci_get_device (h);
757 if (p->type != LINUX_PCI_DEVICE_TYPE_VFIO)
758 return clib_error_return (0, "vfio driver is needed for MSI-X interrupt "
762 vec_validate_init_empty (p->msix_irqs, start + count - 1, (linux_pci_irq_t)
766 for (i = start; i < start + count; i++)
768 clib_file_t t = { 0 };
769 linux_pci_irq_t *irq = vec_elt_at_index (p->msix_irqs, i);
770 ASSERT (irq->fd == -1);
772 irq->fd = eventfd (0, EFD_NONBLOCK);
775 err = clib_error_return_unix (0, "eventfd");
779 t.read_function = linux_pci_vfio_msix_read_ready;
780 t.file_descriptor = irq->fd;
781 t.error_function = linux_pci_vfio_error_ready;
782 t.private_data = p->handle << 16 | i;
783 t.description = format (0, "PCI %U MSI-X #%u", format_vlib_pci_addr,
785 irq->clib_file_index = clib_file_add (&file_main, &t);
786 irq->msix_handler = msix_handler;
794 linux_pci_irq_t *irq = vec_elt_at_index (p->msix_irqs, i);
797 clib_file_del_by_index (&file_main, irq->clib_file_index);
806 vlib_pci_enable_msix_irq (vlib_pci_dev_handle_t h, u16 start, u16 count)
808 linux_pci_device_t *p = linux_pci_get_device (h);
812 if (p->type != LINUX_PCI_DEVICE_TYPE_VFIO)
813 return clib_error_return (0, "vfio driver is needed for MSI-X interrupt "
816 for (i = start; i < start + count; i++)
818 linux_pci_irq_t *irq = vec_elt_at_index (p->msix_irqs, i);
822 return vfio_set_irqs (p, VFIO_PCI_MSIX_IRQ_INDEX, start, count,
823 VFIO_IRQ_SET_ACTION_TRIGGER, fds);
827 vlib_pci_disable_msix_irq (vlib_pci_dev_handle_t h, u16 start, u16 count)
829 linux_pci_device_t *p = linux_pci_get_device (h);
832 if (p->type != LINUX_PCI_DEVICE_TYPE_VFIO)
833 return clib_error_return (0, "vfio driver is needed for MSI-X interrupt "
836 for (i = start; i < start + count; i++)
839 return vfio_set_irqs (p, VFIO_PCI_MSIX_IRQ_INDEX, start, count,
840 VFIO_IRQ_SET_ACTION_TRIGGER, fds);
843 static linux_pci_vfio_iommu_group_t *
844 get_vfio_iommu_group (int group)
846 linux_pci_main_t *lpm = &linux_pci_main;
849 p = hash_get (lpm->iommu_pool_index_by_group, group);
851 return p ? pool_elt_at_index (lpm->iommu_groups, p[0]) : 0;
854 static clib_error_t *
855 open_vfio_iommu_group (int group)
857 linux_pci_main_t *lpm = &linux_pci_main;
858 linux_pci_vfio_iommu_group_t *g;
859 clib_error_t *err = 0;
860 struct vfio_group_status group_status;
864 g = get_vfio_iommu_group (group);
870 s = format (s, "/dev/vfio/%u%c", group, 0);
871 fd = open ((char *) s, O_RDWR);
873 return clib_error_return_unix (0, "open '%s'", s);
875 group_status.argsz = sizeof (group_status);
876 if (ioctl (fd, VFIO_GROUP_GET_STATUS, &group_status) < 0)
878 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_STATUS) '%s'",
883 if (!(group_status.flags & VFIO_GROUP_FLAGS_VIABLE))
885 err = clib_error_return (0, "iommu group %d is not viable (not all "
886 "devices in this group bound to vfio-pci)",
891 if (ioctl (fd, VFIO_GROUP_SET_CONTAINER, &lpm->vfio_container_fd) < 0)
893 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_SET_CONTAINER) '%s'",
898 if (lpm->vfio_iommu_mode == 0)
900 if (ioctl (lpm->vfio_container_fd, VFIO_SET_IOMMU, VFIO_TYPE1_IOMMU) <
903 err = clib_error_return_unix (0, "ioctl(VFIO_SET_IOMMU) "
907 lpm->vfio_iommu_mode = VFIO_TYPE1_IOMMU;
911 pool_get (lpm->iommu_groups, g);
914 hash_set (lpm->iommu_pool_index_by_group, group, g - lpm->iommu_groups);
922 static clib_error_t *
923 add_device_vfio (vlib_main_t * vm, linux_pci_device_t * p,
924 vlib_pci_device_info_t * di, pci_device_registration_t * r)
926 linux_pci_vfio_iommu_group_t *g;
927 struct vfio_device_info device_info = { 0 };
928 struct vfio_region_info reg = { 0 };
929 struct vfio_irq_info irq_info = { 0 };
930 clib_error_t *err = 0;
933 p->addr.as_u32 = di->addr.as_u32;
934 p->type = LINUX_PCI_DEVICE_TYPE_VFIO;
936 if (di->driver_name == 0 ||
937 (strcmp ("vfio-pci", (char *) di->driver_name) != 0))
938 return clib_error_return (0, "Device '%U' (iommu group %d) not bound to "
939 "vfio-pci", format_vlib_pci_addr, &di->addr,
942 if ((err = open_vfio_iommu_group (di->iommu_group)))
945 g = get_vfio_iommu_group (di->iommu_group);
947 s = format (s, "%U%c", format_vlib_pci_addr, &di->addr, 0);
948 if ((p->fd = ioctl (g->fd, VFIO_GROUP_GET_DEVICE_FD, (char *) s)) < 0)
950 err = clib_error_return_unix (0, "ioctl(VFIO_GROUP_GET_DEVICE_FD) '%U'",
951 format_vlib_pci_addr, &di->addr);
954 vec_reset_length (s);
956 device_info.argsz = sizeof (device_info);
957 if (ioctl (p->fd, VFIO_DEVICE_GET_INFO, &device_info) < 0)
959 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_INFO) '%U'",
960 format_vlib_pci_addr, &di->addr);
964 irq_info.argsz = sizeof (struct vfio_irq_info);
965 irq_info.index = VFIO_PCI_INTX_IRQ_INDEX;
966 if (ioctl (p->fd, VFIO_DEVICE_GET_IRQ_INFO, &irq_info) < 0)
968 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_IRQ_INFO) "
969 "'%U'", format_vlib_pci_addr, &di->addr);
973 /* reset if device supports it */
974 if (device_info.flags & VFIO_DEVICE_FLAGS_RESET)
975 if (ioctl (p->fd, VFIO_DEVICE_RESET) < 0)
977 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_RESET) '%U'",
978 format_vlib_pci_addr, &di->addr);
982 if ((irq_info.flags & VFIO_IRQ_INFO_EVENTFD) && irq_info.count == 1)
984 u8 buf[sizeof (struct vfio_irq_set) + sizeof (int)] = { 0 };
985 struct vfio_irq_set *irq_set = (struct vfio_irq_set *) buf;
986 clib_file_t t = { 0 };
987 int efd = eventfd (0, EFD_NONBLOCK);
989 irq_set->argsz = sizeof (buf);
991 irq_set->index = VFIO_PCI_INTX_IRQ_INDEX;
993 VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
994 clib_memcpy (&irq_set->data, &efd, sizeof (int));
996 if (ioctl (p->fd, VFIO_DEVICE_SET_IRQS, irq_set) < 0)
998 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_SET_IRQS) '%U'",
999 format_vlib_pci_addr, &di->addr);
1003 t.read_function = linux_pci_vfio_intx_read_ready;
1004 t.file_descriptor = efd;
1005 t.error_function = linux_pci_vfio_error_ready;
1006 t.private_data = p->handle;
1007 p->clib_file_index = clib_file_add (&file_main, &t);
1009 /* unmask the interrupt */
1010 linux_pci_vfio_unmask_intx (p);
1013 p->interrupt_handler = r->interrupt_handler;
1015 reg.argsz = sizeof (struct vfio_region_info);
1016 reg.index = VFIO_PCI_CONFIG_REGION_INDEX;
1017 if (ioctl (p->fd, VFIO_DEVICE_GET_REGION_INFO, ®) < 0)
1019 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_REGION_INFO) "
1020 "'%U'", format_vlib_pci_addr, &di->addr);
1023 p->config_offset = reg.offset;
1024 p->config_fd = p->fd;
1026 err = r->init_function (vm, p->handle);
1034 if (p->config_fd != -1)
1035 close (p->config_fd);
1040 /* Configuration space read/write. */
1042 vlib_pci_read_write_config (vlib_pci_dev_handle_t h,
1043 vlib_read_or_write_t read_or_write,
1044 uword address, void *data, u32 n_bytes)
1046 linux_pci_device_t *p = linux_pci_get_device (h);
1049 if (read_or_write == VLIB_READ)
1050 n = pread (p->config_fd, data, n_bytes, p->config_offset + address);
1052 n = pwrite (p->config_fd, data, n_bytes, p->config_offset + address);
1055 return clib_error_return_unix (0, "%s",
1056 read_or_write == VLIB_READ
1057 ? "read" : "write");
1062 static clib_error_t *
1063 vlib_pci_map_region_int (vlib_pci_dev_handle_t h,
1064 u32 bar, u8 * addr, void **result)
1066 linux_pci_device_t *p = linux_pci_get_device (h);
1068 clib_error_t *error;
1069 int flags = MAP_SHARED;
1070 u64 size = 0, offset = 0;
1076 if (p->type == LINUX_PCI_DEVICE_TYPE_UIO)
1079 struct stat stat_buf;
1080 file_name = format (0, "%s/%U/resource%d%c", sysfs_pci_dev_path,
1081 format_vlib_pci_addr, &p->addr, bar, 0);
1083 fd = open ((char *) file_name, O_RDWR);
1086 error = clib_error_return_unix (0, "open `%s'", file_name);
1087 vec_free (file_name);
1091 if (fstat (fd, &stat_buf) < 0)
1093 error = clib_error_return_unix (0, "fstat `%s'", file_name);
1094 vec_free (file_name);
1099 vec_free (file_name);
1102 size = stat_buf.st_size;
1105 else if (p->type == LINUX_PCI_DEVICE_TYPE_VFIO)
1107 struct vfio_region_info reg = { 0 };
1108 reg.argsz = sizeof (struct vfio_region_info);
1110 if (ioctl (p->fd, VFIO_DEVICE_GET_REGION_INFO, ®) < 0)
1111 return clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_INFO) "
1112 "'%U'", format_vlib_pci_addr,
1116 offset = reg.offset;
1121 *result = mmap (addr, size, PROT_READ | PROT_WRITE, flags, fd, offset);
1122 if (*result == (void *) -1)
1124 error = clib_error_return_unix (0, "mmap `BAR%u'", bar);
1125 if (p->type == LINUX_PCI_DEVICE_TYPE_UIO)
1131 vec_validate_init_empty (p->regions, bar,
1132 (linux_pci_region_t) { .fd = -1});
1134 if (p->type == LINUX_PCI_DEVICE_TYPE_UIO)
1135 p->regions[bar].fd = fd;
1136 p->regions[bar].addr = *result;
1137 p->regions[bar].size = size;
1142 vlib_pci_map_region (vlib_pci_dev_handle_t h, u32 resource, void **result)
1144 return (vlib_pci_map_region_int (h, resource, 0 /* addr */ , result));
1148 vlib_pci_map_region_fixed (vlib_pci_dev_handle_t h, u32 resource, u8 * addr,
1151 return (vlib_pci_map_region_int (h, resource, addr, result));
1155 init_device_from_registered (vlib_main_t * vm, vlib_pci_device_info_t * di)
1157 vlib_pci_main_t *pm = &pci_main;
1158 linux_pci_main_t *lpm = &linux_pci_main;
1159 pci_device_registration_t *r;
1161 clib_error_t *err = 0;
1162 linux_pci_device_t *p;
1164 pool_get (lpm->linux_pci_devices, p);
1165 p->handle = p - lpm->linux_pci_devices;
1167 r = pm->pci_device_registrations;
1171 for (i = r->supported_devices; i->vendor_id != 0; i++)
1172 if (i->vendor_id == di->vendor_id && i->device_id == di->device_id)
1174 if (di->iommu_group != -1)
1175 err = add_device_vfio (vm, p, di, r);
1177 err = add_device_uio (vm, p, di, r);
1180 clib_error_report (err);
1184 r = r->next_registration;
1187 /* No driver, close the PCI config-space FD */
1188 memset (p, 0, sizeof (linux_pci_device_t));
1189 pool_put (lpm->linux_pci_devices, p);
1192 static clib_error_t *
1193 scan_pci_addr (void *arg, u8 * dev_dir_name, u8 * ignored)
1195 vlib_pci_addr_t addr, **addrv = arg;
1196 unformat_input_t input;
1197 clib_error_t *err = 0;
1199 unformat_init_string (&input, (char *) dev_dir_name,
1200 vec_len (dev_dir_name));
1202 if (!unformat (&input, "/sys/bus/pci/devices/%U",
1203 unformat_vlib_pci_addr, &addr))
1204 err = clib_error_return (0, "unformat error `%v`", dev_dir_name);
1206 unformat_free (&input);
1211 vec_add1 (*addrv, addr);
1216 pci_addr_cmp (void *v1, void *v2)
1218 vlib_pci_addr_t *a1 = v1;
1219 vlib_pci_addr_t *a2 = v2;
1221 if (a1->domain > a2->domain)
1223 if (a1->domain < a2->domain)
1225 if (a1->bus > a2->bus)
1227 if (a1->bus < a2->bus)
1229 if (a1->slot > a2->slot)
1231 if (a1->slot < a2->slot)
1233 if (a1->function > a2->function)
1235 if (a1->function < a2->function)
1241 vlib_pci_get_all_dev_addrs ()
1243 vlib_pci_addr_t *addrs = 0;
1245 err = foreach_directory_file ((char *) sysfs_pci_dev_path, scan_pci_addr,
1246 &addrs, /* scan_dirs */ 0);
1253 vec_sort_with_function (addrs, pci_addr_cmp);
1259 linux_pci_init (vlib_main_t * vm)
1261 vlib_pci_main_t *pm = &pci_main;
1262 linux_pci_main_t *lpm = &linux_pci_main;
1263 vlib_pci_addr_t *addr = 0, *addrs;
1264 clib_error_t *error;
1269 if ((error = vlib_call_init_function (vm, unix_input_init)))
1272 ASSERT (sizeof (vlib_pci_addr_t) == sizeof (u32));
1274 fd = open ("/dev/vfio/vfio", O_RDWR);
1276 if ((fd != -1) && (ioctl (fd, VFIO_GET_API_VERSION) != VFIO_API_VERSION))
1282 if ((fd != -1) && (ioctl (fd, VFIO_CHECK_EXTENSION, VFIO_TYPE1_IOMMU) == 0))
1288 lpm->vfio_container_fd = fd;
1289 lpm->iommu_pool_index_by_group = hash_create (0, sizeof (uword));
1291 addrs = vlib_pci_get_all_dev_addrs ();
1293 vec_foreach (addr, addrs)
1295 vlib_pci_device_info_t *d;
1296 if ((d = vlib_pci_get_device_info (addr, 0)))
1298 init_device_from_registered (vm, d);
1299 vlib_pci_free_device_info (d);
1307 VLIB_INIT_FUNCTION (linux_pci_init);
1310 * fd.io coding-style-patch-verification: ON
1313 * eval: (c-set-style "gnu")