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5 * Copyright 2013-2014 6WIND S.A.
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40 #include <sys/queue.h>
43 #include <rte_errno.h>
44 #include <rte_interrupts.h>
48 #include <rte_per_lcore.h>
49 #include <rte_memory.h>
50 #include <rte_memcpy.h>
51 #include <rte_memzone.h>
53 #include <rte_string_fns.h>
54 #include <rte_common.h>
55 #include <rte_devargs.h>
57 #include "eal_private.h"
59 extern struct rte_pci_bus rte_pci_bus;
61 #define SYSFS_PCI_DEVICES "/sys/bus/pci/devices"
63 const char *pci_get_sysfs_path(void)
65 const char *path = NULL;
67 path = getenv("SYSFS_PCI_DEVICES");
69 return SYSFS_PCI_DEVICES;
74 static struct rte_devargs *pci_devargs_lookup(struct rte_pci_device *dev)
76 struct rte_devargs *devargs;
78 TAILQ_FOREACH(devargs, &devargs_list, next) {
79 if (devargs->type != RTE_DEVTYPE_BLACKLISTED_PCI &&
80 devargs->type != RTE_DEVTYPE_WHITELISTED_PCI)
82 if (!rte_eal_compare_pci_addr(&dev->addr, &devargs->pci.addr))
88 /* map a particular resource from a file */
90 pci_map_resource(void *requested_addr, int fd, off_t offset, size_t size,
95 /* Map the PCI memory resource of device */
96 mapaddr = mmap(requested_addr, size, PROT_READ | PROT_WRITE,
97 MAP_SHARED | additional_flags, fd, offset);
98 if (mapaddr == MAP_FAILED) {
99 RTE_LOG(ERR, EAL, "%s(): cannot mmap(%d, %p, 0x%lx, 0x%lx): %s (%p)\n",
100 __func__, fd, requested_addr,
101 (unsigned long)size, (unsigned long)offset,
102 strerror(errno), mapaddr);
104 RTE_LOG(DEBUG, EAL, " PCI memory mapped at %p\n", mapaddr);
109 /* unmap a particular resource */
111 pci_unmap_resource(void *requested_addr, size_t size)
113 if (requested_addr == NULL)
116 /* Unmap the PCI memory resource of device */
117 if (munmap(requested_addr, size)) {
118 RTE_LOG(ERR, EAL, "%s(): cannot munmap(%p, 0x%lx): %s\n",
119 __func__, requested_addr, (unsigned long)size,
122 RTE_LOG(DEBUG, EAL, " PCI memory unmapped at %p\n",
127 * Match the PCI Driver and Device using the ID Table
130 * PCI driver from which ID table would be extracted
132 * PCI device to match against the driver
134 * 1 for successful match
135 * 0 for unsuccessful match
138 rte_pci_match(const struct rte_pci_driver *pci_drv,
139 const struct rte_pci_device *pci_dev)
141 const struct rte_pci_id *id_table;
143 for (id_table = pci_drv->id_table; id_table->vendor_id != 0;
145 /* check if device's identifiers match the driver's ones */
146 if (id_table->vendor_id != pci_dev->id.vendor_id &&
147 id_table->vendor_id != PCI_ANY_ID)
149 if (id_table->device_id != pci_dev->id.device_id &&
150 id_table->device_id != PCI_ANY_ID)
152 if (id_table->subsystem_vendor_id !=
153 pci_dev->id.subsystem_vendor_id &&
154 id_table->subsystem_vendor_id != PCI_ANY_ID)
156 if (id_table->subsystem_device_id !=
157 pci_dev->id.subsystem_device_id &&
158 id_table->subsystem_device_id != PCI_ANY_ID)
160 if (id_table->class_id != pci_dev->id.class_id &&
161 id_table->class_id != RTE_CLASS_ANY_ID)
171 * If vendor/device ID match, call the probe() function of the
175 rte_pci_probe_one_driver(struct rte_pci_driver *dr,
176 struct rte_pci_device *dev)
179 struct rte_pci_addr *loc;
181 if ((dr == NULL) || (dev == NULL))
186 /* The device is not blacklisted; Check if driver supports it */
187 if (!rte_pci_match(dr, dev))
188 /* Match of device and driver failed */
191 RTE_LOG(INFO, EAL, "PCI device "PCI_PRI_FMT" on NUMA socket %i\n",
192 loc->domain, loc->bus, loc->devid, loc->function,
193 dev->device.numa_node);
195 /* no initialization when blacklisted, return without error */
196 if (dev->device.devargs != NULL &&
197 dev->device.devargs->type ==
198 RTE_DEVTYPE_BLACKLISTED_PCI) {
199 RTE_LOG(INFO, EAL, " Device is blacklisted, not"
204 RTE_LOG(INFO, EAL, " probe driver: %x:%x %s\n", dev->id.vendor_id,
205 dev->id.device_id, dr->driver.name);
207 if (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING) {
208 /* map resources for devices that use igb_uio */
209 ret = rte_pci_map_device(dev);
214 /* reference driver structure */
216 dev->device.driver = &dr->driver;
218 /* call the driver probe() function */
219 ret = dr->probe(dr, dev);
222 if ((dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING) &&
223 /* Don't unmap if device is unsupported and
224 * driver needs mapped resources.
227 (dr->drv_flags & RTE_PCI_DRV_KEEP_MAPPED_RES)))
228 rte_pci_unmap_device(dev);
235 * If vendor/device ID match, call the remove() function of the
239 rte_pci_detach_dev(struct rte_pci_device *dev)
241 struct rte_pci_addr *loc;
242 struct rte_pci_driver *dr;
250 RTE_LOG(DEBUG, EAL, "PCI device "PCI_PRI_FMT" on NUMA socket %i\n",
251 loc->domain, loc->bus, loc->devid,
252 loc->function, dev->device.numa_node);
254 RTE_LOG(DEBUG, EAL, " remove driver: %x:%x %s\n", dev->id.vendor_id,
255 dev->id.device_id, dr->driver.name);
257 if (dr->remove && (dr->remove(dev) < 0))
258 return -1; /* negative value is an error */
260 /* clear driver structure */
263 if (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING)
264 /* unmap resources for devices that use igb_uio */
265 rte_pci_unmap_device(dev);
271 * If vendor/device ID match, call the probe() function of all
272 * registered driver for the given device. Return -1 if initialization
273 * failed, return 1 if no driver is found for this device.
276 pci_probe_all_drivers(struct rte_pci_device *dev)
278 struct rte_pci_driver *dr = NULL;
284 /* Check if a driver is already loaded */
285 if (dev->driver != NULL)
288 FOREACH_DRIVER_ON_PCIBUS(dr) {
289 rc = rte_pci_probe_one_driver(dr, dev);
291 /* negative value is an error */
294 /* positive value means driver doesn't support it */
302 * Find the pci device specified by pci address, then invoke probe function of
303 * the driver of the device.
306 rte_pci_probe_one(const struct rte_pci_addr *addr)
308 struct rte_pci_device *dev = NULL;
315 /* update current pci device in global list, kernel bindings might have
316 * changed since last time we looked at it.
318 if (pci_update_device(addr) < 0)
321 FOREACH_DEVICE_ON_PCIBUS(dev) {
322 if (rte_eal_compare_pci_addr(&dev->addr, addr))
325 ret = pci_probe_all_drivers(dev);
333 RTE_LOG(WARNING, EAL,
334 "Requested device " PCI_PRI_FMT " cannot be used\n",
335 addr->domain, addr->bus, addr->devid, addr->function);
340 * Detach device specified by its pci address.
343 rte_pci_detach(const struct rte_pci_addr *addr)
345 struct rte_pci_device *dev = NULL;
351 FOREACH_DEVICE_ON_PCIBUS(dev) {
352 if (rte_eal_compare_pci_addr(&dev->addr, addr))
355 ret = rte_pci_detach_dev(dev);
357 /* negative value is an error */
360 /* positive value means driver doesn't support it */
363 rte_pci_remove_device(dev);
370 RTE_LOG(WARNING, EAL, "Requested device " PCI_PRI_FMT
371 " cannot be used\n", dev->addr.domain, dev->addr.bus,
372 dev->addr.devid, dev->addr.function);
377 * Scan the content of the PCI bus, and call the probe() function for
378 * all registered drivers that have a matching entry in its id_table
379 * for discovered devices.
384 struct rte_pci_device *dev = NULL;
385 size_t probed = 0, failed = 0;
386 struct rte_devargs *devargs;
390 if (rte_eal_devargs_type_count(RTE_DEVTYPE_WHITELISTED_PCI) == 0)
393 FOREACH_DEVICE_ON_PCIBUS(dev) {
396 /* set devargs in PCI structure */
397 devargs = pci_devargs_lookup(dev);
399 dev->device.devargs = devargs;
401 /* probe all or only whitelisted devices */
403 ret = pci_probe_all_drivers(dev);
404 else if (devargs != NULL &&
405 devargs->type == RTE_DEVTYPE_WHITELISTED_PCI)
406 ret = pci_probe_all_drivers(dev);
408 RTE_LOG(ERR, EAL, "Requested device " PCI_PRI_FMT
409 " cannot be used\n", dev->addr.domain, dev->addr.bus,
410 dev->addr.devid, dev->addr.function);
417 return (probed && probed == failed) ? -1 : 0;
420 /* dump one device */
422 pci_dump_one_device(FILE *f, struct rte_pci_device *dev)
426 fprintf(f, PCI_PRI_FMT, dev->addr.domain, dev->addr.bus,
427 dev->addr.devid, dev->addr.function);
428 fprintf(f, " - vendor:%x device:%x\n", dev->id.vendor_id,
431 for (i = 0; i != sizeof(dev->mem_resource) /
432 sizeof(dev->mem_resource[0]); i++) {
433 fprintf(f, " %16.16"PRIx64" %16.16"PRIx64"\n",
434 dev->mem_resource[i].phys_addr,
435 dev->mem_resource[i].len);
440 /* dump devices on the bus */
442 rte_pci_dump(FILE *f)
444 struct rte_pci_device *dev = NULL;
446 FOREACH_DEVICE_ON_PCIBUS(dev) {
447 pci_dump_one_device(f, dev);
451 /* register a driver */
453 rte_pci_register(struct rte_pci_driver *driver)
455 TAILQ_INSERT_TAIL(&rte_pci_bus.driver_list, driver, next);
456 driver->bus = &rte_pci_bus;
459 /* unregister a driver */
461 rte_pci_unregister(struct rte_pci_driver *driver)
463 TAILQ_REMOVE(&rte_pci_bus.driver_list, driver, next);
467 /* Add a device to PCI bus */
469 rte_pci_add_device(struct rte_pci_device *pci_dev)
471 TAILQ_INSERT_TAIL(&rte_pci_bus.device_list, pci_dev, next);
474 /* Insert a device into a predefined position in PCI bus */
476 rte_pci_insert_device(struct rte_pci_device *exist_pci_dev,
477 struct rte_pci_device *new_pci_dev)
479 TAILQ_INSERT_BEFORE(exist_pci_dev, new_pci_dev, next);
482 /* Remove a device from PCI bus */
484 rte_pci_remove_device(struct rte_pci_device *pci_dev)
486 TAILQ_REMOVE(&rte_pci_bus.device_list, pci_dev, next);
489 static struct rte_device *
490 pci_find_device(const struct rte_device *start, rte_dev_cmp_t cmp,
493 struct rte_pci_device *dev;
495 FOREACH_DEVICE_ON_PCIBUS(dev) {
496 if (start && &dev->device == start) {
497 start = NULL; /* starting point found */
500 if (cmp(&dev->device, data) == 0)
508 pci_plug(struct rte_device *dev, const char *devargs __rte_unused)
510 struct rte_pci_device *pdev;
511 struct rte_pci_addr *addr;
513 addr = &RTE_DEV_TO_PCI(dev)->addr;
515 /* Find the current device holding this address in the bus. */
516 FOREACH_DEVICE_ON_PCIBUS(pdev) {
517 if (rte_eal_compare_pci_addr(&pdev->addr, addr) == 0)
518 return rte_pci_probe_one(addr);
526 pci_unplug(struct rte_device *dev)
528 struct rte_pci_device *pdev;
530 pdev = RTE_DEV_TO_PCI(dev);
531 if (rte_pci_detach(&pdev->addr) != 0) {
538 struct rte_pci_bus rte_pci_bus = {
540 .scan = rte_pci_scan,
541 .probe = rte_pci_probe,
542 .find_device = pci_find_device,
544 .unplug = pci_unplug,
546 .device_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.device_list),
547 .driver_list = TAILQ_HEAD_INITIALIZER(rte_pci_bus.driver_list),
550 RTE_REGISTER_BUS(pci, rte_pci_bus.bus);