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39 #include <rte_eal_memconfig.h>
40 #include <rte_malloc.h>
41 #include <rte_devargs.h>
42 #include <rte_memcpy.h>
44 #include "eal_filesystem.h"
45 #include "eal_private.h"
46 #include "eal_pci_init.h"
50 * PCI probing under linux
52 * This code is used to simulate a PCI probe by parsing information in sysfs.
53 * When a registered device matches a driver, it is then initialized with
54 * IGB_UIO driver (or doesn't initialize, if the device wasn't bound to it).
57 /* unbind kernel driver for this device */
59 pci_unbind_kernel_driver(struct rte_pci_device *dev)
63 char filename[PATH_MAX];
65 struct rte_pci_addr *loc = &dev->addr;
67 /* open /sys/bus/pci/devices/AAAA:BB:CC.D/driver */
68 snprintf(filename, sizeof(filename),
69 "%s/" PCI_PRI_FMT "/driver/unbind", pci_get_sysfs_path(),
70 loc->domain, loc->bus, loc->devid, loc->function);
72 f = fopen(filename, "w");
73 if (f == NULL) /* device was not bound */
76 n = snprintf(buf, sizeof(buf), PCI_PRI_FMT "\n",
77 loc->domain, loc->bus, loc->devid, loc->function);
78 if ((n < 0) || (n >= (int)sizeof(buf))) {
79 RTE_LOG(ERR, EAL, "%s(): snprintf failed\n", __func__);
82 if (fwrite(buf, n, 1, f) == 0) {
83 RTE_LOG(ERR, EAL, "%s(): could not write to %s\n", __func__,
97 pci_get_kernel_driver_by_path(const char *filename, char *dri_name,
104 if (!filename || !dri_name)
107 count = readlink(filename, path, PATH_MAX);
108 if (count >= PATH_MAX)
111 /* For device does not have a driver */
117 name = strrchr(path, '/');
119 strlcpy(dri_name, name + 1, len);
128 rte_eal_pci_map_device(struct rte_pci_device *dev)
132 /* try mapping the NIC resources using VFIO if it exists */
136 if (pci_vfio_is_enabled())
137 ret = pci_vfio_map_resource(dev);
140 case RTE_KDRV_IGB_UIO:
141 case RTE_KDRV_UIO_GENERIC:
142 /* map resources for devices that use uio */
143 ret = pci_uio_map_resource(dev);
147 " Not managed by a supported kernel driver, skipped\n");
155 /* Unmap pci device */
157 rte_eal_pci_unmap_device(struct rte_pci_device *dev)
159 /* try unmapping the NIC resources using VFIO if it exists */
162 RTE_LOG(ERR, EAL, "Hotplug doesn't support vfio yet\n");
164 case RTE_KDRV_IGB_UIO:
165 case RTE_KDRV_UIO_GENERIC:
166 /* unmap resources for devices that use uio */
167 pci_uio_unmap_resource(dev);
171 " Not managed by a supported kernel driver, skipped\n");
177 pci_find_max_end_va(void)
179 const struct rte_memseg *seg = rte_eal_get_physmem_layout();
180 const struct rte_memseg *last = seg;
183 for (i = 0; i < RTE_MAX_MEMSEG; i++, seg++) {
184 if (seg->addr == NULL)
187 if (seg->addr > last->addr)
191 return RTE_PTR_ADD(last->addr, last->len);
194 /* parse one line of the "resource" sysfs file (note that the 'line'
195 * string is modified)
198 pci_parse_one_sysfs_resource(char *line, size_t len, uint64_t *phys_addr,
199 uint64_t *end_addr, uint64_t *flags)
201 union pci_resource_info {
207 char *ptrs[PCI_RESOURCE_FMT_NVAL];
210 if (rte_strsplit(line, len, res_info.ptrs, 3, ' ') != 3) {
212 "%s(): bad resource format\n", __func__);
216 *phys_addr = strtoull(res_info.phys_addr, NULL, 16);
217 *end_addr = strtoull(res_info.end_addr, NULL, 16);
218 *flags = strtoull(res_info.flags, NULL, 16);
221 "%s(): bad resource format\n", __func__);
228 /* parse the "resource" sysfs file */
230 pci_parse_sysfs_resource(const char *filename, struct rte_pci_device *dev)
235 uint64_t phys_addr, end_addr, flags;
237 f = fopen(filename, "r");
239 RTE_LOG(ERR, EAL, "Cannot open sysfs resource\n");
243 for (i = 0; i<PCI_MAX_RESOURCE; i++) {
245 if (fgets(buf, sizeof(buf), f) == NULL) {
247 "%s(): cannot read resource\n", __func__);
250 if (pci_parse_one_sysfs_resource(buf, sizeof(buf), &phys_addr,
251 &end_addr, &flags) < 0)
254 if (flags & IORESOURCE_MEM) {
255 dev->mem_resource[i].phys_addr = phys_addr;
256 dev->mem_resource[i].len = end_addr - phys_addr + 1;
257 /* not mapped for now */
258 dev->mem_resource[i].addr = NULL;
269 /* Scan one pci sysfs entry, and fill the devices list from it. */
271 pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus,
272 uint8_t devid, uint8_t function)
274 char filename[PATH_MAX];
276 struct rte_pci_device *dev;
277 char driver[PATH_MAX];
280 dev = malloc(sizeof(*dev));
284 memset(dev, 0, sizeof(*dev));
285 dev->addr.domain = domain;
287 dev->addr.devid = devid;
288 dev->addr.function = function;
291 snprintf(filename, sizeof(filename), "%s/vendor", dirname);
292 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
296 dev->id.vendor_id = (uint16_t)tmp;
299 snprintf(filename, sizeof(filename), "%s/device", dirname);
300 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
304 dev->id.device_id = (uint16_t)tmp;
306 /* get subsystem_vendor id */
307 snprintf(filename, sizeof(filename), "%s/subsystem_vendor",
309 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
313 dev->id.subsystem_vendor_id = (uint16_t)tmp;
315 /* get subsystem_device id */
316 snprintf(filename, sizeof(filename), "%s/subsystem_device",
318 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
322 dev->id.subsystem_device_id = (uint16_t)tmp;
325 snprintf(filename, sizeof(filename), "%s/class",
327 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
331 /* the least 24 bits are valid: class, subclass, program interface */
332 dev->id.class_id = (uint32_t)tmp & RTE_CLASS_ANY_ID;
336 snprintf(filename, sizeof(filename), "%s/max_vfs", dirname);
337 if (!access(filename, F_OK) &&
338 eal_parse_sysfs_value(filename, &tmp) == 0)
339 dev->max_vfs = (uint16_t)tmp;
341 /* for non igb_uio driver, need kernel version >= 3.8 */
342 snprintf(filename, sizeof(filename),
343 "%s/sriov_numvfs", dirname);
344 if (!access(filename, F_OK) &&
345 eal_parse_sysfs_value(filename, &tmp) == 0)
346 dev->max_vfs = (uint16_t)tmp;
350 snprintf(filename, sizeof(filename), "%s/numa_node",
352 if (access(filename, R_OK) != 0) {
353 /* if no NUMA support, set default to 0 */
354 dev->device.numa_node = 0;
356 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
360 dev->device.numa_node = tmp;
363 /* parse resources */
364 snprintf(filename, sizeof(filename), "%s/resource", dirname);
365 if (pci_parse_sysfs_resource(filename, dev) < 0) {
366 RTE_LOG(ERR, EAL, "%s(): cannot parse resource\n", __func__);
372 snprintf(filename, sizeof(filename), "%s/driver", dirname);
373 ret = pci_get_kernel_driver_by_path(filename, driver, sizeof(driver));
375 RTE_LOG(ERR, EAL, "Fail to get kernel driver\n");
381 if (!strcmp(driver, "vfio-pci"))
382 dev->kdrv = RTE_KDRV_VFIO;
383 else if (!strcmp(driver, "igb_uio"))
384 dev->kdrv = RTE_KDRV_IGB_UIO;
385 else if (!strcmp(driver, "uio_pci_generic"))
386 dev->kdrv = RTE_KDRV_UIO_GENERIC;
388 dev->kdrv = RTE_KDRV_UNKNOWN;
390 dev->kdrv = RTE_KDRV_NONE;
392 /* device is valid, add in list (sorted) */
393 if (TAILQ_EMPTY(&pci_device_list)) {
394 rte_eal_device_insert(&dev->device);
395 TAILQ_INSERT_TAIL(&pci_device_list, dev, next);
397 struct rte_pci_device *dev2;
400 TAILQ_FOREACH(dev2, &pci_device_list, next) {
401 ret = rte_eal_compare_pci_addr(&dev->addr, &dev2->addr);
406 TAILQ_INSERT_BEFORE(dev2, dev, next);
407 rte_eal_device_insert(&dev->device);
408 } else { /* already registered */
409 dev2->kdrv = dev->kdrv;
410 dev2->max_vfs = dev->max_vfs;
411 memmove(dev2->mem_resource, dev->mem_resource,
412 sizeof(dev->mem_resource));
417 rte_eal_device_insert(&dev->device);
418 TAILQ_INSERT_TAIL(&pci_device_list, dev, next);
425 pci_update_device(const struct rte_pci_addr *addr)
427 char filename[PATH_MAX];
429 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT,
430 pci_get_sysfs_path(), addr->domain, addr->bus, addr->devid,
433 return pci_scan_one(filename, addr->domain, addr->bus, addr->devid,
438 * split up a pci address into its constituent parts.
441 parse_pci_addr_format(const char *buf, int bufsize, uint16_t *domain,
442 uint8_t *bus, uint8_t *devid, uint8_t *function)
444 /* first split on ':' */
452 char *str[PCI_FMT_NVAL]; /* last element-separator is "." not ":" */
455 char *buf_copy = strndup(buf, bufsize);
456 if (buf_copy == NULL)
459 if (rte_strsplit(buf_copy, bufsize, splitaddr.str, PCI_FMT_NVAL, ':')
462 /* final split is on '.' between devid and function */
463 splitaddr.function = strchr(splitaddr.devid,'.');
464 if (splitaddr.function == NULL)
466 *splitaddr.function++ = '\0';
468 /* now convert to int values */
470 *domain = (uint16_t)strtoul(splitaddr.domain, NULL, 16);
471 *bus = (uint8_t)strtoul(splitaddr.bus, NULL, 16);
472 *devid = (uint8_t)strtoul(splitaddr.devid, NULL, 16);
473 *function = (uint8_t)strtoul(splitaddr.function, NULL, 10);
477 free(buf_copy); /* free the copy made with strdup */
485 * Scan the content of the PCI bus, and the devices in the devices
489 rte_eal_pci_scan(void)
493 char dirname[PATH_MAX];
495 uint8_t bus, devid, function;
497 dir = opendir(pci_get_sysfs_path());
499 RTE_LOG(ERR, EAL, "%s(): opendir failed: %s\n",
500 __func__, strerror(errno));
504 while ((e = readdir(dir)) != NULL) {
505 if (e->d_name[0] == '.')
508 if (parse_pci_addr_format(e->d_name, sizeof(e->d_name), &domain,
509 &bus, &devid, &function) != 0)
512 snprintf(dirname, sizeof(dirname), "%s/%s",
513 pci_get_sysfs_path(), e->d_name);
514 if (pci_scan_one(dirname, domain, bus, devid, function) < 0)
525 /* Read PCI config space. */
526 int rte_eal_pci_read_config(const struct rte_pci_device *device,
527 void *buf, size_t len, off_t offset)
529 const struct rte_intr_handle *intr_handle = &device->intr_handle;
531 switch (intr_handle->type) {
532 case RTE_INTR_HANDLE_UIO:
533 case RTE_INTR_HANDLE_UIO_INTX:
534 return pci_uio_read_config(intr_handle, buf, len, offset);
537 case RTE_INTR_HANDLE_VFIO_MSIX:
538 case RTE_INTR_HANDLE_VFIO_MSI:
539 case RTE_INTR_HANDLE_VFIO_LEGACY:
540 return pci_vfio_read_config(intr_handle, buf, len, offset);
544 "Unknown handle type of fd %d\n",
550 /* Write PCI config space. */
551 int rte_eal_pci_write_config(const struct rte_pci_device *device,
552 const void *buf, size_t len, off_t offset)
554 const struct rte_intr_handle *intr_handle = &device->intr_handle;
556 switch (intr_handle->type) {
557 case RTE_INTR_HANDLE_UIO:
558 case RTE_INTR_HANDLE_UIO_INTX:
559 return pci_uio_write_config(intr_handle, buf, len, offset);
562 case RTE_INTR_HANDLE_VFIO_MSIX:
563 case RTE_INTR_HANDLE_VFIO_MSI:
564 case RTE_INTR_HANDLE_VFIO_LEGACY:
565 return pci_vfio_write_config(intr_handle, buf, len, offset);
569 "Unknown handle type of fd %d\n",
575 #if defined(RTE_ARCH_X86)
577 pci_ioport_map(struct rte_pci_device *dev, int bar __rte_unused,
578 struct rte_pci_ioport *p)
587 snprintf(pci_id, sizeof(pci_id), PCI_PRI_FMT,
588 dev->addr.domain, dev->addr.bus,
589 dev->addr.devid, dev->addr.function);
591 fp = fopen("/proc/ioports", "r");
593 RTE_LOG(ERR, EAL, "%s(): can't open ioports\n", __func__);
597 while (getdelim(&line, &linesz, '\n', fp) > 0) {
602 n = strcspn(ptr, ":");
606 while (*left && isspace(*left))
609 if (!strncmp(left, pci_id, strlen(pci_id))) {
612 while (*ptr && isspace(*ptr))
615 sscanf(ptr, "%04hx-%04hx", &start, &end);
628 RTE_LOG(DEBUG, EAL, "PCI Port IO found start=0x%x\n", start);
635 rte_eal_pci_ioport_map(struct rte_pci_device *dev, int bar,
636 struct rte_pci_ioport *p)
643 if (pci_vfio_is_enabled())
644 ret = pci_vfio_ioport_map(dev, bar, p);
647 case RTE_KDRV_IGB_UIO:
648 ret = pci_uio_ioport_map(dev, bar, p);
650 case RTE_KDRV_UIO_GENERIC:
651 #if defined(RTE_ARCH_X86)
652 ret = pci_ioport_map(dev, bar, p);
654 ret = pci_uio_ioport_map(dev, bar, p);
658 #if defined(RTE_ARCH_X86)
659 ret = pci_ioport_map(dev, bar, p);
673 rte_eal_pci_ioport_read(struct rte_pci_ioport *p,
674 void *data, size_t len, off_t offset)
676 switch (p->dev->kdrv) {
679 pci_vfio_ioport_read(p, data, len, offset);
682 case RTE_KDRV_IGB_UIO:
683 pci_uio_ioport_read(p, data, len, offset);
685 case RTE_KDRV_UIO_GENERIC:
686 pci_uio_ioport_read(p, data, len, offset);
689 #if defined(RTE_ARCH_X86)
690 pci_uio_ioport_read(p, data, len, offset);
699 rte_eal_pci_ioport_write(struct rte_pci_ioport *p,
700 const void *data, size_t len, off_t offset)
702 switch (p->dev->kdrv) {
705 pci_vfio_ioport_write(p, data, len, offset);
708 case RTE_KDRV_IGB_UIO:
709 pci_uio_ioport_write(p, data, len, offset);
711 case RTE_KDRV_UIO_GENERIC:
712 pci_uio_ioport_write(p, data, len, offset);
715 #if defined(RTE_ARCH_X86)
716 pci_uio_ioport_write(p, data, len, offset);
725 rte_eal_pci_ioport_unmap(struct rte_pci_ioport *p)
729 switch (p->dev->kdrv) {
732 if (pci_vfio_is_enabled())
733 ret = pci_vfio_ioport_unmap(p);
736 case RTE_KDRV_IGB_UIO:
737 ret = pci_uio_ioport_unmap(p);
739 case RTE_KDRV_UIO_GENERIC:
740 #if defined(RTE_ARCH_X86)
743 ret = pci_uio_ioport_unmap(p);
747 #if defined(RTE_ARCH_X86)
758 /* Init the PCI EAL subsystem */
760 rte_eal_pci_init(void)
762 /* for debug purposes, PCI can be disabled */
763 if (internal_config.no_pci)
766 if (rte_eal_pci_scan() < 0) {
767 RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);