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>
45 #include <vlib/linux/vfio.h>
47 #include <sys/types.h>
51 #include <sys/ioctl.h>
53 #include <linux/ethtool.h>
54 #include <linux/sockios.h>
55 #include <linux/vfio.h>
56 #include <sys/eventfd.h>
58 static const char *sysfs_pci_dev_path = "/sys/bus/pci/devices";
59 static const char *sysfs_pci_drv_path = "/sys/bus/pci/drivers";
60 static char *sysfs_mod_vfio_noiommu =
61 "/sys/module/vfio/parameters/enable_unsafe_noiommu_mode";
76 pci_intx_handler_function_t *intx_handler;
77 pci_msix_handler_function_t *msix_handler;
83 LINUX_PCI_DEVICE_TYPE_UNKNOWN,
84 LINUX_PCI_DEVICE_TYPE_UIO,
85 LINUX_PCI_DEVICE_TYPE_VFIO,
86 } linux_pci_device_type_t;
90 linux_pci_device_type_t type;
91 vlib_pci_dev_handle_t handle;
94 /* Resource file descriptors. */
95 linux_pci_region_t *regions;
97 /* File descriptor for config space read/write. */
101 /* Device File descriptor */
104 /* Minor device for uio device. */
107 /* Index given by clib_file_add. */
110 /* Interrupt handlers */
111 linux_pci_irq_t intx_irq;
112 linux_pci_irq_t *msix_irqs;
117 } linux_pci_device_t;
119 /* Pool of PCI devices. */
122 vlib_main_t *vlib_main;
123 linux_pci_device_t *linux_pci_devices;
127 extern linux_pci_main_t linux_pci_main;
129 static linux_pci_device_t *
130 linux_pci_get_device (vlib_pci_dev_handle_t h)
132 linux_pci_main_t *lpm = &linux_pci_main;
133 return pool_elt_at_index (lpm->linux_pci_devices, h);
137 vlib_pci_get_private_data (vlib_pci_dev_handle_t h)
139 linux_pci_device_t *d = linux_pci_get_device (h);
140 return d->private_data;
144 vlib_pci_set_private_data (vlib_pci_dev_handle_t h, uword private_data)
146 linux_pci_device_t *d = linux_pci_get_device (h);
147 d->private_data = private_data;
151 vlib_pci_get_addr (vlib_pci_dev_handle_t h)
153 linux_pci_device_t *d = linux_pci_get_device (h);
157 /* Call to allocate/initialize the pci subsystem.
158 This is not an init function so that users can explicitly enable
159 pci only when it's needed. */
160 clib_error_t *pci_bus_init (vlib_main_t * vm);
162 linux_pci_main_t linux_pci_main;
164 vlib_pci_device_info_t *
165 vlib_pci_get_device_info (vlib_pci_addr_t * addr, clib_error_t ** error)
167 linux_vfio_main_t *lvm = &vfio_main;
169 vlib_pci_device_info_t *di;
174 di = clib_mem_alloc (sizeof (vlib_pci_device_info_t));
175 memset (di, 0, sizeof (vlib_pci_device_info_t));
176 di->addr.as_u32 = addr->as_u32;
178 u8 *dev_dir_name = format (0, "%s/%U", sysfs_pci_dev_path,
179 format_vlib_pci_addr, addr);
181 f = format (0, "%v/config%c", dev_dir_name, 0);
182 fd = open ((char *) f, O_RDWR);
184 /* Try read-only access if write fails. */
186 fd = open ((char *) f, O_RDONLY);
190 err = clib_error_return_unix (0, "open `%s'", f);
194 /* You can only read more that 64 bytes of config space as root; so we try to
195 read the full space but fall back to just the first 64 bytes. */
196 if (read (fd, &di->config_data, sizeof (di->config_data)) <
197 sizeof (di->config0))
199 err = clib_error_return_unix (0, "read `%s'", f);
205 static pci_config_header_t all_ones;
206 if (all_ones.vendor_id == 0)
207 memset (&all_ones, ~0, sizeof (all_ones));
209 if (!memcmp (&di->config0.header, &all_ones, sizeof (all_ones)))
211 err = clib_error_return (0, "invalid PCI config for `%s'", f);
217 if (di->config0.header.header_type == 0)
218 pci_config_type0_little_to_host (&di->config0);
220 pci_config_type1_little_to_host (&di->config1);
223 vec_reset_length (f);
224 f = format (f, "%v/numa_node%c", dev_dir_name, 0);
225 err = clib_sysfs_read ((char *) f, "%u", &di->numa_node);
229 clib_error_free (err);
232 vec_reset_length (f);
233 f = format (f, "%v/class%c", dev_dir_name, 0);
234 err = clib_sysfs_read ((char *) f, "0x%x", &tmp);
237 di->device_class = tmp >> 8;
239 vec_reset_length (f);
240 f = format (f, "%v/vendor%c", dev_dir_name, 0);
241 err = clib_sysfs_read ((char *) f, "0x%x", &tmp);
246 vec_reset_length (f);
247 f = format (f, "%v/device%c", dev_dir_name, 0);
248 err = clib_sysfs_read ((char *) f, "0x%x", &tmp);
253 vec_reset_length (f);
254 f = format (f, "%v/driver%c", dev_dir_name, 0);
255 di->driver_name = clib_sysfs_link_to_name ((char *) f);
257 di->iommu_group = -1;
258 if (lvm->container_fd != -1)
261 vec_reset_length (f);
262 f = format (f, "%v/iommu_group%c", dev_dir_name, 0);
263 tmpstr = clib_sysfs_link_to_name ((char *) f);
266 di->iommu_group = atoi ((char *) tmpstr);
273 vec_reset_length (f);
274 f = format (f, "%v/vpd%c", dev_dir_name, 0);
275 fd = open ((char *) f, O_RDONLY);
284 if (read (fd, &tag, 3) != 3)
287 if (tag[0] != 0x82 && tag[0] != 0x90 && tag[0] != 0x91)
290 len = (tag[2] << 8) | tag[1];
291 vec_validate (data, len);
293 if (read (fd, data, len) != len)
299 di->product_name = data;
300 else if (tag[0] == 0x90)
302 else if (tag[0] == 0x91)
313 vlib_pci_free_device_info (di);
318 vec_free (dev_dir_name);
322 clib_error_free (err);
327 directory_exists (char *path)
329 struct stat s = { 0 };
330 if (stat (path, &s) == -1)
333 return S_ISDIR (s.st_mode);
337 vlib_pci_bind_to_uio (vlib_pci_addr_t * addr, char *uio_drv_name)
339 clib_error_t *error = 0;
340 u8 *s = 0, *driver_name = 0;
343 vlib_pci_device_info_t *di;
344 int fd, clear_driver_override = 0;
345 u8 *dev_dir_name = format (0, "%s/%U", sysfs_pci_dev_path,
346 format_vlib_pci_addr, addr);
348 di = vlib_pci_get_device_info (addr, &error);
353 if (strncmp ("auto", uio_drv_name, 5) == 0)
355 int vfio_pci_loaded = 0;
357 if (directory_exists ("/sys/module/vfio_pci"))
360 if (di->iommu_group != -1)
362 /* device is bound to IOMMU group */
363 if (!vfio_pci_loaded)
365 error = clib_error_return (0, "Skipping PCI device %U: device "
366 "is bound to IOMMU group and "
367 "vfio-pci driver is not loaded",
368 format_vlib_pci_addr, addr);
372 uio_drv_name = "vfio-pci";
376 /* device is not bound to IOMMU group so we have multiple options */
377 if (vfio_pci_loaded &&
378 (error = clib_sysfs_write (sysfs_mod_vfio_noiommu, "Y")) == 0)
379 uio_drv_name = "vfio-pci";
380 else if (directory_exists ("/sys/module/uio_pci_generic"))
381 uio_drv_name = "uio_pci_generic";
382 else if (directory_exists ("/sys/module/igb_uio"))
383 uio_drv_name = "igb_uio";
386 clib_error_free (error);
387 error = clib_error_return (0, "Skipping PCI device %U: missing "
388 "kernel VFIO or UIO driver",
389 format_vlib_pci_addr, addr);
392 clib_error_free (error);
396 s = format (s, "%v/driver%c", dev_dir_name, 0);
397 driver_name = clib_sysfs_link_to_name ((char *) s);
398 vec_reset_length (s);
401 ((strcmp ("vfio-pci", (char *) driver_name) == 0) ||
402 (strcmp ("uio_pci_generic", (char *) driver_name) == 0) ||
403 (strcmp ("igb_uio", (char *) driver_name) == 0)))
406 /* walk trough all linux interfaces and if interface belonging to
407 this device is founf check if interface is admin up */
408 dir = opendir ("/sys/class/net");
409 s = format (s, "%U%c", format_vlib_pci_addr, addr, 0);
413 error = clib_error_return (0, "Skipping PCI device %U: failed to "
414 "read /sys/class/net",
415 format_vlib_pci_addr, addr);
419 fd = socket (PF_INET, SOCK_DGRAM, 0);
422 error = clib_error_return_unix (0, "socket");
426 while ((e = readdir (dir)))
429 struct ethtool_drvinfo drvinfo;
431 if (e->d_name[0] == '.') /* skip . and .. */
434 memset (&ifr, 0, sizeof ifr);
435 memset (&drvinfo, 0, sizeof drvinfo);
436 ifr.ifr_data = (char *) &drvinfo;
437 strncpy (ifr.ifr_name, e->d_name, IFNAMSIZ - 1);
438 drvinfo.cmd = ETHTOOL_GDRVINFO;
439 if (ioctl (fd, SIOCETHTOOL, &ifr) < 0)
441 /* Some interfaces (eg "lo") don't support this ioctl */
442 if ((errno != ENOTSUP) && (errno != ENODEV))
443 clib_unix_warning ("ioctl fetch intf %s bus info error",
448 if (strcmp ((char *) s, drvinfo.bus_info))
451 memset (&ifr, 0, sizeof (ifr));
452 strncpy (ifr.ifr_name, e->d_name, IFNAMSIZ - 1);
453 if (ioctl (fd, SIOCGIFFLAGS, &ifr) < 0)
455 error = clib_error_return_unix (0, "ioctl fetch intf %s flags",
461 if (ifr.ifr_flags & IFF_UP)
463 error = clib_error_return (0, "Skipping PCI device %U as host "
464 "interface %s is up",
465 format_vlib_pci_addr, addr, e->d_name);
472 vec_reset_length (s);
474 s = format (s, "%v/driver/unbind%c", dev_dir_name, 0);
475 clib_sysfs_write ((char *) s, "%U", format_vlib_pci_addr, addr);
476 vec_reset_length (s);
478 s = format (s, "%v/driver_override%c", dev_dir_name, 0);
479 if (access ((char *) s, F_OK) == 0)
481 clib_sysfs_write ((char *) s, "%s", uio_drv_name);
482 clear_driver_override = 1;
486 vec_reset_length (s);
487 s = format (s, "%s/%s/new_id%c", sysfs_pci_drv_path, uio_drv_name, 0);
488 clib_sysfs_write ((char *) s, "0x%04x 0x%04x", di->vendor_id,
491 vec_reset_length (s);
493 s = format (s, "%s/%s/bind%c", sysfs_pci_drv_path, uio_drv_name, 0);
494 clib_sysfs_write ((char *) s, "%U", format_vlib_pci_addr, addr);
495 vec_reset_length (s);
497 if (clear_driver_override)
499 s = format (s, "%v/driver_override%c", dev_dir_name, 0);
500 clib_sysfs_write ((char *) s, "%c", 0);
501 vec_reset_length (s);
507 vec_free (dev_dir_name);
508 vec_free (driver_name);
513 static clib_error_t *
514 scan_uio_dir (void *arg, u8 * path_name, u8 * file_name)
516 linux_pci_device_t *l = arg;
517 unformat_input_t input;
519 unformat_init_string (&input, (char *) file_name, vec_len (file_name));
521 if (!unformat (&input, "uio%d", &l->uio_minor))
524 unformat_free (&input);
528 static clib_error_t *
529 vfio_set_irqs (linux_pci_device_t * p, u32 index, u32 start, u32 count,
530 u32 flags, int *efds)
532 int data_len = efds ? count * sizeof (int) : 0;
533 u8 buf[sizeof (struct vfio_irq_set) + data_len];
534 struct vfio_irq_info irq_info = { 0 };
535 struct vfio_irq_set *irq_set = (struct vfio_irq_set *) buf;
538 irq_info.argsz = sizeof (struct vfio_irq_info);
539 irq_info.index = index;
541 if (ioctl (p->fd, VFIO_DEVICE_GET_IRQ_INFO, &irq_info) < 0)
542 return clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_IRQ_INFO) "
543 "'%U'", format_vlib_pci_addr, &p->addr);
545 if (irq_info.count < start + count)
546 return clib_error_return_unix (0, "vfio_set_irq: unexistng interrupt on "
547 "'%U'", format_vlib_pci_addr, &p->addr);
552 flags |= VFIO_IRQ_SET_DATA_EVENTFD;
553 clib_memcpy (&irq_set->data, efds, data_len);
556 flags |= VFIO_IRQ_SET_DATA_NONE;
558 ASSERT ((flags & (VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_DATA_EVENTFD)) !=
559 (VFIO_IRQ_SET_DATA_NONE | VFIO_IRQ_SET_DATA_EVENTFD));
561 irq_set->argsz = sizeof (struct vfio_irq_set) + data_len;
562 irq_set->index = index;
563 irq_set->start = start;
564 irq_set->count = count;
565 irq_set->flags = flags;
567 if (ioctl (p->fd, VFIO_DEVICE_SET_IRQS, irq_set) < 0)
568 return clib_error_return_unix (0, "%U:ioctl(VFIO_DEVICE_SET_IRQS) "
569 "[index = %u, start = %u, count = %u, "
571 format_vlib_pci_addr, &p->addr,
572 index, start, count, flags);
576 static clib_error_t *
577 linux_pci_uio_read_ready (clib_file_t * uf)
579 int __attribute__ ((unused)) rv;
580 vlib_pci_dev_handle_t h = uf->private_data;
581 linux_pci_device_t *p = linux_pci_get_device (h);
582 linux_pci_irq_t *irq = &p->intx_irq;
585 rv = read (uf->file_descriptor, &icount, 4);
587 if (irq->intx_handler)
588 irq->intx_handler (h);
590 vlib_pci_intr_enable (h);
592 return /* no error */ 0;
595 static clib_error_t *
596 linux_pci_vfio_unmask_intx (linux_pci_device_t * d)
598 return vfio_set_irqs (d, VFIO_PCI_INTX_IRQ_INDEX, 0, 1,
599 VFIO_IRQ_SET_ACTION_UNMASK, 0);
602 static clib_error_t *
603 linux_pci_uio_error_ready (clib_file_t * uf)
605 u32 error_index = (u32) uf->private_data;
607 return clib_error_return (0, "pci device %d: error", error_index);
610 static clib_error_t *
611 linux_pci_vfio_msix_read_ready (clib_file_t * uf)
613 int __attribute__ ((unused)) rv;
614 vlib_pci_dev_handle_t h = uf->private_data >> 16;
615 u16 line = uf->private_data & 0xffff;
616 linux_pci_device_t *p = linux_pci_get_device (h);
617 linux_pci_irq_t *irq = vec_elt_at_index (p->msix_irqs, line);
620 rv = read (uf->file_descriptor, &icount, sizeof (icount));
622 if (irq->msix_handler)
623 irq->msix_handler (h, line);
625 return /* no error */ 0;
628 static clib_error_t *
629 linux_pci_vfio_intx_read_ready (clib_file_t * uf)
631 int __attribute__ ((unused)) rv;
632 vlib_pci_dev_handle_t h = uf->private_data;
633 linux_pci_device_t *p = linux_pci_get_device (h);
634 linux_pci_irq_t *irq = &p->intx_irq;
637 rv = read (uf->file_descriptor, &icount, sizeof (icount));
639 if (irq->intx_handler)
640 irq->intx_handler (h);
642 linux_pci_vfio_unmask_intx (p);
644 return /* no error */ 0;
647 static clib_error_t *
648 linux_pci_vfio_error_ready (clib_file_t * uf)
650 u32 error_index = (u32) uf->private_data;
652 return clib_error_return (0, "pci device %d: error", error_index);
655 static clib_error_t *
656 add_device_uio (linux_pci_device_t * p, vlib_pci_device_info_t * di,
657 pci_device_registration_t * r)
659 linux_pci_main_t *lpm = &linux_pci_main;
660 clib_error_t *err = 0;
663 p->addr.as_u32 = di->addr.as_u32;
665 p->type = LINUX_PCI_DEVICE_TYPE_UIO;
667 s = format (s, "%s/%U/config%c", sysfs_pci_dev_path,
668 format_vlib_pci_addr, &di->addr, 0);
670 p->config_fd = open ((char *) s, O_RDWR);
671 p->config_offset = 0;
672 vec_reset_length (s);
674 if (p->config_fd == -1)
676 err = clib_error_return_unix (0, "open '%s'", s);
680 s = format (0, "%s/%U/uio", sysfs_pci_dev_path,
681 format_vlib_pci_addr, &di->addr);
682 foreach_directory_file ((char *) s, scan_uio_dir, p, /* scan_dirs */
684 vec_reset_length (s);
686 s = format (s, "/dev/uio%d%c", p->uio_minor, 0);
687 p->fd = open ((char *) s, O_RDWR);
690 err = clib_error_return_unix (0, "open '%s'", s);
694 if (r && r->interrupt_handler)
695 vlib_pci_register_intx_handler (p->handle, r->interrupt_handler);
697 if (r && r->init_function)
698 err = r->init_function (lpm->vlib_main, p->handle);
704 if (p->config_fd != -1)
705 close (p->config_fd);
713 vlib_pci_register_intx_handler (vlib_pci_dev_handle_t h,
714 pci_intx_handler_function_t * intx_handler)
716 linux_pci_device_t *p = linux_pci_get_device (h);
717 clib_file_t t = { 0 };
718 linux_pci_irq_t *irq = &p->intx_irq;
719 ASSERT (irq->fd == -1);
721 if (p->type == LINUX_PCI_DEVICE_TYPE_VFIO)
723 struct vfio_irq_info irq_info = { 0 };
724 irq_info.argsz = sizeof (struct vfio_irq_info);
725 irq_info.index = VFIO_PCI_INTX_IRQ_INDEX;
726 if (ioctl (p->fd, VFIO_DEVICE_GET_IRQ_INFO, &irq_info) < 0)
727 return clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_IRQ_INFO) '"
728 "%U'", format_vlib_pci_addr, &p->addr);
729 if (irq_info.count != 1)
730 return clib_error_return (0, "INTx interrupt does not exist on device"
731 "'%U'", format_vlib_pci_addr, &p->addr);
733 irq->fd = eventfd (0, EFD_NONBLOCK);
735 return clib_error_return_unix (0, "eventfd");
736 t.file_descriptor = irq->fd;
737 t.read_function = linux_pci_vfio_intx_read_ready;
739 else if (p->type == LINUX_PCI_DEVICE_TYPE_UIO)
741 t.file_descriptor = p->fd;
742 t.read_function = linux_pci_uio_read_ready;
747 t.error_function = linux_pci_uio_error_ready;
748 t.private_data = p->handle;
749 t.description = format (0, "PCI %U INTx", format_vlib_pci_addr, &p->addr);
750 irq->clib_file_index = clib_file_add (&file_main, &t);
751 irq->intx_handler = intx_handler;
756 vlib_pci_register_msix_handler (vlib_pci_dev_handle_t h, u32 start, u32 count,
757 pci_msix_handler_function_t * msix_handler)
759 clib_error_t *err = 0;
760 linux_pci_device_t *p = linux_pci_get_device (h);
763 if (p->type != LINUX_PCI_DEVICE_TYPE_VFIO)
764 return clib_error_return (0, "vfio driver is needed for MSI-X interrupt "
768 vec_validate_init_empty (p->msix_irqs, start + count - 1, (linux_pci_irq_t)
772 for (i = start; i < start + count; i++)
774 clib_file_t t = { 0 };
775 linux_pci_irq_t *irq = vec_elt_at_index (p->msix_irqs, i);
776 ASSERT (irq->fd == -1);
778 irq->fd = eventfd (0, EFD_NONBLOCK);
781 err = clib_error_return_unix (0, "eventfd");
785 t.read_function = linux_pci_vfio_msix_read_ready;
786 t.file_descriptor = irq->fd;
787 t.error_function = linux_pci_vfio_error_ready;
788 t.private_data = p->handle << 16 | i;
789 t.description = format (0, "PCI %U MSI-X #%u", format_vlib_pci_addr,
791 irq->clib_file_index = clib_file_add (&file_main, &t);
792 irq->msix_handler = msix_handler;
800 linux_pci_irq_t *irq = vec_elt_at_index (p->msix_irqs, i);
803 clib_file_del_by_index (&file_main, irq->clib_file_index);
812 vlib_pci_enable_msix_irq (vlib_pci_dev_handle_t h, u16 start, u16 count)
814 linux_pci_device_t *p = linux_pci_get_device (h);
818 if (p->type != LINUX_PCI_DEVICE_TYPE_VFIO)
819 return clib_error_return (0, "vfio driver is needed for MSI-X interrupt "
822 for (i = start; i < start + count; i++)
824 linux_pci_irq_t *irq = vec_elt_at_index (p->msix_irqs, i);
828 return vfio_set_irqs (p, VFIO_PCI_MSIX_IRQ_INDEX, start, count,
829 VFIO_IRQ_SET_ACTION_TRIGGER, fds);
833 vlib_pci_disable_msix_irq (vlib_pci_dev_handle_t h, u16 start, u16 count)
835 linux_pci_device_t *p = linux_pci_get_device (h);
838 if (p->type != LINUX_PCI_DEVICE_TYPE_VFIO)
839 return clib_error_return (0, "vfio driver is needed for MSI-X interrupt "
842 for (i = start; i < start + count; i++)
845 return vfio_set_irqs (p, VFIO_PCI_MSIX_IRQ_INDEX, start, count,
846 VFIO_IRQ_SET_ACTION_TRIGGER, fds);
849 static clib_error_t *
850 add_device_vfio (linux_pci_device_t * p, vlib_pci_device_info_t * di,
851 pci_device_registration_t * r)
853 linux_pci_main_t *lpm = &linux_pci_main;
854 struct vfio_device_info device_info = { 0 };
855 clib_error_t *err = 0;
858 p->addr.as_u32 = di->addr.as_u32;
859 p->type = LINUX_PCI_DEVICE_TYPE_VFIO;
861 if (di->driver_name == 0 ||
862 (strcmp ("vfio-pci", (char *) di->driver_name) != 0))
863 return clib_error_return (0, "Device '%U' (iommu group %d) not bound to "
864 "vfio-pci", format_vlib_pci_addr, &di->addr,
867 if ((err = linux_vfio_group_get_device_fd (&p->addr, &p->fd)))
870 device_info.argsz = sizeof (device_info);
871 if (ioctl (p->fd, VFIO_DEVICE_GET_INFO, &device_info) < 0)
873 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_INFO) '%U'",
874 format_vlib_pci_addr, &di->addr);
878 /* reset if device supports it */
879 if (device_info.flags & VFIO_DEVICE_FLAGS_RESET)
880 if (ioctl (p->fd, VFIO_DEVICE_RESET) < 0)
882 err = clib_error_return_unix (0, "ioctl(VFIO_DEVICE_RESET) '%U'",
883 format_vlib_pci_addr, &di->addr);
887 if (r && r->interrupt_handler)
889 vlib_pci_register_intx_handler (p->handle, r->interrupt_handler);
890 linux_pci_vfio_unmask_intx (p);
893 if (r && r->init_function)
894 err = r->init_function (lpm->vlib_main, p->handle);
902 if (p->config_fd != -1)
903 close (p->config_fd);
908 /* Configuration space read/write. */
910 vlib_pci_read_write_config (vlib_pci_dev_handle_t h,
911 vlib_read_or_write_t read_or_write,
912 uword address, void *data, u32 n_bytes)
914 linux_pci_device_t *p = linux_pci_get_device (h);
917 if (read_or_write == VLIB_READ)
918 n = pread (p->config_fd, data, n_bytes, p->config_offset + address);
920 n = pwrite (p->config_fd, data, n_bytes, p->config_offset + address);
923 return clib_error_return_unix (0, "%s",
924 read_or_write == VLIB_READ
930 static clib_error_t *
931 vlib_pci_map_region_int (vlib_pci_dev_handle_t h,
932 u32 bar, u8 * addr, void **result)
934 linux_pci_device_t *p = linux_pci_get_device (h);
937 int flags = MAP_SHARED;
938 u64 size = 0, offset = 0;
944 if (p->type == LINUX_PCI_DEVICE_TYPE_UIO)
947 struct stat stat_buf;
948 file_name = format (0, "%s/%U/resource%d%c", sysfs_pci_dev_path,
949 format_vlib_pci_addr, &p->addr, bar, 0);
951 fd = open ((char *) file_name, O_RDWR);
954 error = clib_error_return_unix (0, "open `%s'", file_name);
955 vec_free (file_name);
959 if (fstat (fd, &stat_buf) < 0)
961 error = clib_error_return_unix (0, "fstat `%s'", file_name);
962 vec_free (file_name);
967 vec_free (file_name);
970 size = stat_buf.st_size;
973 else if (p->type == LINUX_PCI_DEVICE_TYPE_VFIO)
975 struct vfio_region_info reg = { 0 };
976 reg.argsz = sizeof (struct vfio_region_info);
978 if (ioctl (p->fd, VFIO_DEVICE_GET_REGION_INFO, ®) < 0)
979 return clib_error_return_unix (0, "ioctl(VFIO_DEVICE_GET_INFO) "
980 "'%U'", format_vlib_pci_addr,
989 *result = mmap (addr, size, PROT_READ | PROT_WRITE, flags, fd, offset);
990 if (*result == (void *) -1)
992 error = clib_error_return_unix (0, "mmap `BAR%u'", bar);
993 if (p->type == LINUX_PCI_DEVICE_TYPE_UIO)
999 vec_validate_init_empty (p->regions, bar,
1000 (linux_pci_region_t) { .fd = -1});
1002 if (p->type == LINUX_PCI_DEVICE_TYPE_UIO)
1003 p->regions[bar].fd = fd;
1004 p->regions[bar].addr = *result;
1005 p->regions[bar].size = size;
1010 vlib_pci_map_region (vlib_pci_dev_handle_t h, u32 resource, void **result)
1012 return (vlib_pci_map_region_int (h, resource, 0 /* addr */ , result));
1016 vlib_pci_map_region_fixed (vlib_pci_dev_handle_t h, u32 resource, u8 * addr,
1019 return (vlib_pci_map_region_int (h, resource, addr, result));
1023 init_device_from_registered (vlib_pci_device_info_t * di)
1025 vlib_pci_main_t *pm = &pci_main;
1026 linux_pci_main_t *lpm = &linux_pci_main;
1027 pci_device_registration_t *r;
1029 clib_error_t *err = 0;
1030 linux_pci_device_t *p;
1032 pool_get (lpm->linux_pci_devices, p);
1033 p->handle = p - lpm->linux_pci_devices;
1034 p->intx_irq.fd = -1;
1036 r = pm->pci_device_registrations;
1040 for (i = r->supported_devices; i->vendor_id != 0; i++)
1041 if (i->vendor_id == di->vendor_id && i->device_id == di->device_id)
1043 if (di->iommu_group != -1)
1044 err = add_device_vfio (p, di, r);
1046 err = add_device_uio (p, di, r);
1049 clib_error_report (err);
1053 r = r->next_registration;
1056 /* No driver, close the PCI config-space FD */
1057 memset (p, 0, sizeof (linux_pci_device_t));
1058 pool_put (lpm->linux_pci_devices, p);
1061 static clib_error_t *
1062 scan_pci_addr (void *arg, u8 * dev_dir_name, u8 * ignored)
1064 vlib_pci_addr_t addr, **addrv = arg;
1065 unformat_input_t input;
1066 clib_error_t *err = 0;
1068 unformat_init_string (&input, (char *) dev_dir_name,
1069 vec_len (dev_dir_name));
1071 if (!unformat (&input, "/sys/bus/pci/devices/%U",
1072 unformat_vlib_pci_addr, &addr))
1073 err = clib_error_return (0, "unformat error `%v`", dev_dir_name);
1075 unformat_free (&input);
1080 vec_add1 (*addrv, addr);
1085 pci_addr_cmp (void *v1, void *v2)
1087 vlib_pci_addr_t *a1 = v1;
1088 vlib_pci_addr_t *a2 = v2;
1090 if (a1->domain > a2->domain)
1092 if (a1->domain < a2->domain)
1094 if (a1->bus > a2->bus)
1096 if (a1->bus < a2->bus)
1098 if (a1->slot > a2->slot)
1100 if (a1->slot < a2->slot)
1102 if (a1->function > a2->function)
1104 if (a1->function < a2->function)
1110 vlib_pci_get_all_dev_addrs ()
1112 vlib_pci_addr_t *addrs = 0;
1114 err = foreach_directory_file ((char *) sysfs_pci_dev_path, scan_pci_addr,
1115 &addrs, /* scan_dirs */ 0);
1122 vec_sort_with_function (addrs, pci_addr_cmp);
1128 linux_pci_init (vlib_main_t * vm)
1130 vlib_pci_main_t *pm = &pci_main;
1131 vlib_pci_addr_t *addr = 0, *addrs;
1132 clib_error_t *error;
1136 if ((error = vlib_call_init_function (vm, unix_input_init)))
1139 ASSERT (sizeof (vlib_pci_addr_t) == sizeof (u32));
1141 addrs = vlib_pci_get_all_dev_addrs ();
1143 vec_foreach (addr, addrs)
1145 vlib_pci_device_info_t *d;
1146 if ((d = vlib_pci_get_device_info (addr, 0)))
1148 init_device_from_registered (d);
1149 vlib_pci_free_device_info (d);
1157 VLIB_INIT_FUNCTION (linux_pci_init);
1160 * fd.io coding-style-patch-verification: ON
1163 * eval: (c-set-style "gnu")