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40 #include <rte_tailq.h>
41 #include <rte_eal_memconfig.h>
42 #include <rte_malloc.h>
43 #include <rte_devargs.h>
45 #include "rte_pci_dev_ids.h"
46 #include "eal_filesystem.h"
47 #include "eal_private.h"
48 #include "eal_pci_init.h"
52 * PCI probing under linux
54 * This code is used to simulate a PCI probe by parsing information in sysfs.
55 * When a registered device matches a driver, it is then initialized with
56 * IGB_UIO driver (or doesn't initialize, if the device wasn't bound to it).
59 struct mapped_pci_res_list *pci_res_list = NULL;
61 /* unbind kernel driver for this device */
63 pci_unbind_kernel_driver(struct rte_pci_device *dev)
67 char filename[PATH_MAX];
69 struct rte_pci_addr *loc = &dev->addr;
71 /* open /sys/bus/pci/devices/AAAA:BB:CC.D/driver */
72 snprintf(filename, sizeof(filename),
73 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/driver/unbind",
74 loc->domain, loc->bus, loc->devid, loc->function);
76 f = fopen(filename, "w");
77 if (f == NULL) /* device was not bound */
80 n = snprintf(buf, sizeof(buf), PCI_PRI_FMT "\n",
81 loc->domain, loc->bus, loc->devid, loc->function);
82 if ((n < 0) || (n >= (int)sizeof(buf))) {
83 RTE_LOG(ERR, EAL, "%s(): snprintf failed\n", __func__);
86 if (fwrite(buf, n, 1, f) == 0) {
87 RTE_LOG(ERR, EAL, "%s(): could not write to %s\n", __func__,
101 pci_find_max_end_va(void)
103 const struct rte_memseg *seg = rte_eal_get_physmem_layout();
104 const struct rte_memseg *last = seg;
107 for (i = 0; i < RTE_MAX_MEMSEG; i++, seg++) {
108 if (seg->addr == NULL)
111 if (seg->addr > last->addr)
115 return RTE_PTR_ADD(last->addr, last->len);
119 /* map a particular resource from a file */
121 pci_map_resource(void *requested_addr, int fd, off_t offset, size_t size,
122 int additional_flags)
126 /* Map the PCI memory resource of device */
127 mapaddr = mmap(requested_addr, size, PROT_READ | PROT_WRITE,
128 MAP_SHARED | additional_flags, fd, offset);
129 if (mapaddr == MAP_FAILED) {
130 RTE_LOG(ERR, EAL, "%s(): cannot mmap(%d, %p, 0x%lx, 0x%lx): %s (%p)\n",
131 __func__, fd, requested_addr,
132 (unsigned long)size, (unsigned long)offset,
133 strerror(errno), mapaddr);
135 RTE_LOG(DEBUG, EAL, " PCI memory mapped at %p\n", mapaddr);
141 /* parse the "resource" sysfs file */
143 pci_parse_sysfs_resource(const char *filename, struct rte_pci_device *dev)
147 union pci_resource_info {
153 char *ptrs[PCI_RESOURCE_FMT_NVAL];
156 uint64_t phys_addr, end_addr, flags;
158 f = fopen(filename, "r");
160 RTE_LOG(ERR, EAL, "Cannot open sysfs resource\n");
164 for (i = 0; i<PCI_MAX_RESOURCE; i++) {
166 if (fgets(buf, sizeof(buf), f) == NULL) {
168 "%s(): cannot read resource\n", __func__);
172 if (rte_strsplit(buf, sizeof(buf), res_info.ptrs, 3, ' ') != 3) {
174 "%s(): bad resource format\n", __func__);
178 phys_addr = strtoull(res_info.phys_addr, NULL, 16);
179 end_addr = strtoull(res_info.end_addr, NULL, 16);
180 flags = strtoull(res_info.flags, NULL, 16);
183 "%s(): bad resource format\n", __func__);
187 if (flags & IORESOURCE_MEM) {
188 dev->mem_resource[i].phys_addr = phys_addr;
189 dev->mem_resource[i].len = end_addr - phys_addr + 1;
190 /* not mapped for now */
191 dev->mem_resource[i].addr = NULL;
202 /* Compare two PCI device addresses. */
204 pci_addr_comparison(struct rte_pci_addr *addr, struct rte_pci_addr *addr2)
206 uint64_t dev_addr = (addr->domain << 24) + (addr->bus << 16) + (addr->devid << 8) + addr->function;
207 uint64_t dev_addr2 = (addr2->domain << 24) + (addr2->bus << 16) + (addr2->devid << 8) + addr2->function;
209 if (dev_addr > dev_addr2)
216 /* Scan one pci sysfs entry, and fill the devices list from it. */
218 pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus,
219 uint8_t devid, uint8_t function)
221 char filename[PATH_MAX];
223 struct rte_pci_device *dev;
225 dev = malloc(sizeof(*dev));
230 memset(dev, 0, sizeof(*dev));
231 dev->addr.domain = domain;
233 dev->addr.devid = devid;
234 dev->addr.function = function;
237 snprintf(filename, sizeof(filename), "%s/vendor", dirname);
238 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
242 dev->id.vendor_id = (uint16_t)tmp;
245 snprintf(filename, sizeof(filename), "%s/device", dirname);
246 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
250 dev->id.device_id = (uint16_t)tmp;
252 /* get subsystem_vendor id */
253 snprintf(filename, sizeof(filename), "%s/subsystem_vendor",
255 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
259 dev->id.subsystem_vendor_id = (uint16_t)tmp;
261 /* get subsystem_device id */
262 snprintf(filename, sizeof(filename), "%s/subsystem_device",
264 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
268 dev->id.subsystem_device_id = (uint16_t)tmp;
272 snprintf(filename, sizeof(filename), "%s/max_vfs", dirname);
273 if (!access(filename, F_OK) &&
274 eal_parse_sysfs_value(filename, &tmp) == 0)
275 dev->max_vfs = (uint16_t)tmp;
277 /* for non igb_uio driver, need kernel version >= 3.8 */
278 snprintf(filename, sizeof(filename),
279 "%s/sriov_numvfs", dirname);
280 if (!access(filename, F_OK) &&
281 eal_parse_sysfs_value(filename, &tmp) == 0)
282 dev->max_vfs = (uint16_t)tmp;
286 snprintf(filename, sizeof(filename), "%s/numa_node",
288 if (access(filename, R_OK) != 0) {
289 /* if no NUMA support just set node to -1 */
292 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
296 dev->numa_node = tmp;
299 /* parse resources */
300 snprintf(filename, sizeof(filename), "%s/resource", dirname);
301 if (pci_parse_sysfs_resource(filename, dev) < 0) {
302 RTE_LOG(ERR, EAL, "%s(): cannot parse resource\n", __func__);
307 /* device is valid, add in list (sorted) */
308 if (TAILQ_EMPTY(&pci_device_list)) {
309 TAILQ_INSERT_TAIL(&pci_device_list, dev, next);
312 struct rte_pci_device *dev2 = NULL;
314 TAILQ_FOREACH(dev2, &pci_device_list, next) {
315 if (pci_addr_comparison(&dev->addr, &dev2->addr))
318 TAILQ_INSERT_BEFORE(dev2, dev, next);
322 TAILQ_INSERT_TAIL(&pci_device_list, dev, next);
329 * split up a pci address into its constituent parts.
332 parse_pci_addr_format(const char *buf, int bufsize, uint16_t *domain,
333 uint8_t *bus, uint8_t *devid, uint8_t *function)
335 /* first split on ':' */
343 char *str[PCI_FMT_NVAL]; /* last element-separator is "." not ":" */
346 char *buf_copy = strndup(buf, bufsize);
347 if (buf_copy == NULL)
350 if (rte_strsplit(buf_copy, bufsize, splitaddr.str, PCI_FMT_NVAL, ':')
353 /* final split is on '.' between devid and function */
354 splitaddr.function = strchr(splitaddr.devid,'.');
355 if (splitaddr.function == NULL)
357 *splitaddr.function++ = '\0';
359 /* now convert to int values */
361 *domain = (uint16_t)strtoul(splitaddr.domain, NULL, 16);
362 *bus = (uint8_t)strtoul(splitaddr.bus, NULL, 16);
363 *devid = (uint8_t)strtoul(splitaddr.devid, NULL, 16);
364 *function = (uint8_t)strtoul(splitaddr.function, NULL, 10);
368 free(buf_copy); /* free the copy made with strdup */
376 * Scan the content of the PCI bus, and the devices in the devices
384 char dirname[PATH_MAX];
386 uint8_t bus, devid, function;
388 dir = opendir(SYSFS_PCI_DEVICES);
390 RTE_LOG(ERR, EAL, "%s(): opendir failed: %s\n",
391 __func__, strerror(errno));
395 while ((e = readdir(dir)) != NULL) {
396 if (e->d_name[0] == '.')
399 if (parse_pci_addr_format(e->d_name, sizeof(e->d_name), &domain,
400 &bus, &devid, &function) != 0)
403 snprintf(dirname, sizeof(dirname), "%s/%s", SYSFS_PCI_DEVICES,
405 if (pci_scan_one(dirname, domain, bus, devid, function) < 0)
416 #ifdef RTE_PCI_CONFIG
418 pci_config_extended_tag(struct rte_pci_device *dev)
420 struct rte_pci_addr *loc = &dev->addr;
421 char filename[PATH_MAX];
425 /* not configured, let it as is */
426 if (strncmp(RTE_PCI_EXTENDED_TAG, "on", 2) != 0 &&
427 strncmp(RTE_PCI_EXTENDED_TAG, "off", 3) != 0)
430 snprintf(filename, sizeof(filename),
431 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/" "extended_tag",
432 loc->domain, loc->bus, loc->devid, loc->function);
433 f = fopen(filename, "rw+");
437 fgets(buf, sizeof(buf), f);
438 if (strncmp(RTE_PCI_EXTENDED_TAG, "on", 2) == 0) {
439 /* enable Extended Tag*/
440 if (strncmp(buf, "on", 2) != 0) {
441 fseek(f, 0, SEEK_SET);
445 /* disable Extended Tag */
446 if (strncmp(buf, "off", 3) != 0) {
447 fseek(f, 0, SEEK_SET);
457 pci_config_max_read_request_size(struct rte_pci_device *dev)
459 struct rte_pci_addr *loc = &dev->addr;
460 char filename[PATH_MAX];
461 char buf[BUFSIZ], param[BUFSIZ];
463 /* size can be 128, 256, 512, 1024, 2048, 4096 */
464 uint32_t max_size = RTE_PCI_MAX_READ_REQUEST_SIZE;
466 /* not configured, let it as is */
470 snprintf(filename, sizeof(filename),
471 SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/" "max_read_request_size",
472 loc->domain, loc->bus, loc->devid, loc->function);
473 f = fopen(filename, "rw+");
477 fgets(buf, sizeof(buf), f);
478 snprintf(param, sizeof(param), "%d", max_size);
480 /* check if the size to be set is the same as current */
481 if (strcmp(buf, param) == 0) {
485 fseek(f, 0, SEEK_SET);
493 pci_config_space_set(struct rte_pci_device *dev)
495 if (rte_eal_process_type() != RTE_PROC_PRIMARY)
498 /* configure extended tag */
499 pci_config_extended_tag(dev);
501 /* configure max read request size */
502 pci_config_max_read_request_size(dev);
507 pci_map_device(struct rte_pci_device *dev)
511 /* try mapping the NIC resources using VFIO if it exists */
513 if (pci_vfio_is_enabled()) {
514 ret = pci_vfio_map_resource(dev);
521 /* map resources for devices that use uio_pci_generic or igb_uio */
523 ret = pci_uio_map_resource(dev);
531 * If vendor/device ID match, call the devinit() function of the
535 rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *dev)
538 struct rte_pci_id *id_table;
540 for (id_table = dr->id_table ; id_table->vendor_id != 0; id_table++) {
542 /* check if device's identifiers match the driver's ones */
543 if (id_table->vendor_id != dev->id.vendor_id &&
544 id_table->vendor_id != PCI_ANY_ID)
546 if (id_table->device_id != dev->id.device_id &&
547 id_table->device_id != PCI_ANY_ID)
549 if (id_table->subsystem_vendor_id != dev->id.subsystem_vendor_id &&
550 id_table->subsystem_vendor_id != PCI_ANY_ID)
552 if (id_table->subsystem_device_id != dev->id.subsystem_device_id &&
553 id_table->subsystem_device_id != PCI_ANY_ID)
556 struct rte_pci_addr *loc = &dev->addr;
558 RTE_LOG(DEBUG, EAL, "PCI device "PCI_PRI_FMT" on NUMA socket %i\n",
559 loc->domain, loc->bus, loc->devid, loc->function,
562 RTE_LOG(DEBUG, EAL, " probe driver: %x:%x %s\n", dev->id.vendor_id,
563 dev->id.device_id, dr->name);
565 /* no initialization when blacklisted, return without error */
566 if (dev->devargs != NULL &&
567 dev->devargs->type == RTE_DEVTYPE_BLACKLISTED_PCI) {
568 RTE_LOG(DEBUG, EAL, " Device is blacklisted, not initializing\n");
572 if (dr->drv_flags & RTE_PCI_DRV_NEED_MAPPING) {
573 #ifdef RTE_PCI_CONFIG
575 * Set PCIe config space for high performance.
576 * Return value can be ignored.
578 pci_config_space_set(dev);
580 /* map resources for devices that use igb_uio */
581 ret = pci_map_device(dev);
584 } else if (dr->drv_flags & RTE_PCI_DRV_FORCE_UNBIND &&
585 rte_eal_process_type() == RTE_PROC_PRIMARY) {
586 /* unbind current driver */
587 if (pci_unbind_kernel_driver(dev) < 0)
591 /* reference driver structure */
594 /* call the driver devinit() function */
595 return dr->devinit(dr, dev);
597 /* return positive value if driver is not found */
601 /* Init the PCI EAL subsystem */
603 rte_eal_pci_init(void)
605 TAILQ_INIT(&pci_driver_list);
606 TAILQ_INIT(&pci_device_list);
607 pci_res_list = RTE_TAILQ_RESERVE_BY_IDX(RTE_TAILQ_PCI,
608 mapped_pci_res_list);
610 /* for debug purposes, PCI can be disabled */
611 if (internal_config.no_pci)
614 if (pci_scan() < 0) {
615 RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);
621 if (pci_vfio_is_enabled()) {
623 /* if we are primary process, create a thread to communicate with
624 * secondary processes. the thread will use a socket to wait for
625 * requests from secondary process to send open file descriptors,
626 * because VFIO does not allow multiple open descriptors on a group or
629 if (internal_config.process_type == RTE_PROC_PRIMARY &&
630 pci_vfio_mp_sync_setup() < 0)