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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).
58 pci_get_kernel_driver_by_path(const char *filename, char *dri_name)
64 if (!filename || !dri_name)
67 count = readlink(filename, path, PATH_MAX);
68 if (count >= PATH_MAX)
71 /* For device does not have a driver */
77 name = strrchr(path, '/');
79 strncpy(dri_name, name + 1, strlen(name + 1) + 1);
88 rte_eal_pci_map_device(struct rte_pci_device *dev)
92 /* try mapping the NIC resources using VFIO if it exists */
96 if (pci_vfio_is_enabled())
97 ret = pci_vfio_map_resource(dev);
100 case RTE_KDRV_IGB_UIO:
101 case RTE_KDRV_UIO_GENERIC:
102 /* map resources for devices that use uio */
103 ret = pci_uio_map_resource(dev);
107 " Not managed by a supported kernel driver, skipped\n");
115 /* Unmap pci device */
117 rte_eal_pci_unmap_device(struct rte_pci_device *dev)
119 /* try unmapping the NIC resources using VFIO if it exists */
122 RTE_LOG(ERR, EAL, "Hotplug doesn't support vfio yet\n");
124 case RTE_KDRV_IGB_UIO:
125 case RTE_KDRV_UIO_GENERIC:
126 /* unmap resources for devices that use uio */
127 pci_uio_unmap_resource(dev);
131 " Not managed by a supported kernel driver, skipped\n");
137 pci_find_max_end_va(void)
139 const struct rte_memseg *seg = rte_eal_get_physmem_layout();
140 const struct rte_memseg *last = seg;
143 for (i = 0; i < RTE_MAX_MEMSEG; i++, seg++) {
144 if (seg->addr == NULL)
147 if (seg->addr > last->addr)
151 return RTE_PTR_ADD(last->addr, last->len);
154 /* parse one line of the "resource" sysfs file (note that the 'line'
155 * string is modified)
158 pci_parse_one_sysfs_resource(char *line, size_t len, uint64_t *phys_addr,
159 uint64_t *end_addr, uint64_t *flags)
161 union pci_resource_info {
167 char *ptrs[PCI_RESOURCE_FMT_NVAL];
170 if (rte_strsplit(line, len, res_info.ptrs, 3, ' ') != 3) {
172 "%s(): bad resource format\n", __func__);
176 *phys_addr = strtoull(res_info.phys_addr, NULL, 16);
177 *end_addr = strtoull(res_info.end_addr, NULL, 16);
178 *flags = strtoull(res_info.flags, NULL, 16);
181 "%s(): bad resource format\n", __func__);
188 /* parse the "resource" sysfs file */
190 pci_parse_sysfs_resource(const char *filename, struct rte_pci_device *dev)
195 uint64_t phys_addr, end_addr, flags;
197 f = fopen(filename, "r");
199 RTE_LOG(ERR, EAL, "Cannot open sysfs resource\n");
203 for (i = 0; i<PCI_MAX_RESOURCE; i++) {
205 if (fgets(buf, sizeof(buf), f) == NULL) {
207 "%s(): cannot read resource\n", __func__);
210 if (pci_parse_one_sysfs_resource(buf, sizeof(buf), &phys_addr,
211 &end_addr, &flags) < 0)
214 if (flags & IORESOURCE_MEM) {
215 dev->mem_resource[i].phys_addr = phys_addr;
216 dev->mem_resource[i].len = end_addr - phys_addr + 1;
217 /* not mapped for now */
218 dev->mem_resource[i].addr = NULL;
229 /* Scan one pci sysfs entry, and fill the devices list from it. */
231 pci_scan_one(const char *dirname, const struct rte_pci_addr *addr)
233 char filename[PATH_MAX];
235 struct rte_pci_device *dev;
236 char driver[PATH_MAX];
239 dev = malloc(sizeof(*dev));
243 memset(dev, 0, sizeof(*dev));
247 snprintf(filename, sizeof(filename), "%s/vendor", dirname);
248 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
252 dev->id.vendor_id = (uint16_t)tmp;
255 snprintf(filename, sizeof(filename), "%s/device", dirname);
256 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
260 dev->id.device_id = (uint16_t)tmp;
262 /* get subsystem_vendor id */
263 snprintf(filename, sizeof(filename), "%s/subsystem_vendor",
265 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
269 dev->id.subsystem_vendor_id = (uint16_t)tmp;
271 /* get subsystem_device id */
272 snprintf(filename, sizeof(filename), "%s/subsystem_device",
274 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
278 dev->id.subsystem_device_id = (uint16_t)tmp;
281 snprintf(filename, sizeof(filename), "%s/class",
283 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
287 /* the least 24 bits are valid: class, subclass, program interface */
288 dev->id.class_id = (uint32_t)tmp & RTE_CLASS_ANY_ID;
292 snprintf(filename, sizeof(filename), "%s/max_vfs", dirname);
293 if (!access(filename, F_OK) &&
294 eal_parse_sysfs_value(filename, &tmp) == 0)
295 dev->max_vfs = (uint16_t)tmp;
297 /* for non igb_uio driver, need kernel version >= 3.8 */
298 snprintf(filename, sizeof(filename),
299 "%s/sriov_numvfs", dirname);
300 if (!access(filename, F_OK) &&
301 eal_parse_sysfs_value(filename, &tmp) == 0)
302 dev->max_vfs = (uint16_t)tmp;
306 snprintf(filename, sizeof(filename), "%s/numa_node",
308 if (access(filename, R_OK) != 0) {
309 /* if no NUMA support, set default to 0 */
310 dev->device.numa_node = 0;
312 if (eal_parse_sysfs_value(filename, &tmp) < 0) {
316 dev->device.numa_node = tmp;
319 /* parse resources */
320 snprintf(filename, sizeof(filename), "%s/resource", dirname);
321 if (pci_parse_sysfs_resource(filename, dev) < 0) {
322 RTE_LOG(ERR, EAL, "%s(): cannot parse resource\n", __func__);
328 snprintf(filename, sizeof(filename), "%s/driver", dirname);
329 ret = pci_get_kernel_driver_by_path(filename, driver);
331 RTE_LOG(ERR, EAL, "Fail to get kernel driver\n");
337 if (!strcmp(driver, "vfio-pci"))
338 dev->kdrv = RTE_KDRV_VFIO;
339 else if (!strcmp(driver, "igb_uio"))
340 dev->kdrv = RTE_KDRV_IGB_UIO;
341 else if (!strcmp(driver, "uio_pci_generic"))
342 dev->kdrv = RTE_KDRV_UIO_GENERIC;
344 dev->kdrv = RTE_KDRV_UNKNOWN;
346 dev->kdrv = RTE_KDRV_NONE;
348 /* device is valid, add in list (sorted) */
349 if (TAILQ_EMPTY(&pci_device_list)) {
350 rte_eal_device_insert(&dev->device);
351 TAILQ_INSERT_TAIL(&pci_device_list, dev, next);
353 struct rte_pci_device *dev2;
356 TAILQ_FOREACH(dev2, &pci_device_list, next) {
357 ret = rte_eal_compare_pci_addr(&dev->addr, &dev2->addr);
362 TAILQ_INSERT_BEFORE(dev2, dev, next);
363 rte_eal_device_insert(&dev->device);
364 } else { /* already registered */
365 dev2->kdrv = dev->kdrv;
366 dev2->max_vfs = dev->max_vfs;
367 memmove(dev2->mem_resource, dev->mem_resource,
368 sizeof(dev->mem_resource));
373 rte_eal_device_insert(&dev->device);
374 TAILQ_INSERT_TAIL(&pci_device_list, dev, next);
381 pci_update_device(const struct rte_pci_addr *addr)
383 char filename[PATH_MAX];
385 snprintf(filename, sizeof(filename), "%s/" PCI_PRI_FMT,
386 pci_get_sysfs_path(), addr->domain, addr->bus, addr->devid,
389 return pci_scan_one(filename, addr);
393 * split up a pci address into its constituent parts.
396 parse_pci_addr_format(const char *buf, int bufsize, struct rte_pci_addr *addr)
398 /* first split on ':' */
406 char *str[PCI_FMT_NVAL]; /* last element-separator is "." not ":" */
409 char *buf_copy = strndup(buf, bufsize);
410 if (buf_copy == NULL)
413 if (rte_strsplit(buf_copy, bufsize, splitaddr.str, PCI_FMT_NVAL, ':')
416 /* final split is on '.' between devid and function */
417 splitaddr.function = strchr(splitaddr.devid,'.');
418 if (splitaddr.function == NULL)
420 *splitaddr.function++ = '\0';
422 /* now convert to int values */
424 addr->domain = (uint16_t)strtoul(splitaddr.domain, NULL, 16);
425 addr->bus = (uint8_t)strtoul(splitaddr.bus, NULL, 16);
426 addr->devid = (uint8_t)strtoul(splitaddr.devid, NULL, 16);
427 addr->function = (uint8_t)strtoul(splitaddr.function, NULL, 10);
431 free(buf_copy); /* free the copy made with strdup */
439 * Scan the content of the PCI bus, and the devices in the devices
443 rte_eal_pci_scan(void)
447 char dirname[PATH_MAX];
448 struct rte_pci_addr addr;
450 dir = opendir(pci_get_sysfs_path());
452 RTE_LOG(ERR, EAL, "%s(): opendir failed: %s\n",
453 __func__, strerror(errno));
457 while ((e = readdir(dir)) != NULL) {
458 if (e->d_name[0] == '.')
461 if (parse_pci_addr_format(e->d_name, sizeof(e->d_name), &addr) != 0)
464 snprintf(dirname, sizeof(dirname), "%s/%s",
465 pci_get_sysfs_path(), e->d_name);
466 if (pci_scan_one(dirname, &addr) < 0)
477 /* Read PCI config space. */
478 int rte_eal_pci_read_config(const struct rte_pci_device *device,
479 void *buf, size_t len, off_t offset)
481 const struct rte_intr_handle *intr_handle = &device->intr_handle;
483 switch (intr_handle->type) {
484 case RTE_INTR_HANDLE_UIO:
485 case RTE_INTR_HANDLE_UIO_INTX:
486 return pci_uio_read_config(intr_handle, buf, len, offset);
489 case RTE_INTR_HANDLE_VFIO_MSIX:
490 case RTE_INTR_HANDLE_VFIO_MSI:
491 case RTE_INTR_HANDLE_VFIO_LEGACY:
492 return pci_vfio_read_config(intr_handle, buf, len, offset);
496 "Unknown handle type of fd %d\n",
502 /* Write PCI config space. */
503 int rte_eal_pci_write_config(const struct rte_pci_device *device,
504 const void *buf, size_t len, off_t offset)
506 const struct rte_intr_handle *intr_handle = &device->intr_handle;
508 switch (intr_handle->type) {
509 case RTE_INTR_HANDLE_UIO:
510 case RTE_INTR_HANDLE_UIO_INTX:
511 return pci_uio_write_config(intr_handle, buf, len, offset);
514 case RTE_INTR_HANDLE_VFIO_MSIX:
515 case RTE_INTR_HANDLE_VFIO_MSI:
516 case RTE_INTR_HANDLE_VFIO_LEGACY:
517 return pci_vfio_write_config(intr_handle, buf, len, offset);
521 "Unknown handle type of fd %d\n",
527 #if defined(RTE_ARCH_X86)
529 pci_ioport_map(struct rte_pci_device *dev, int bar __rte_unused,
530 struct rte_pci_ioport *p)
539 snprintf(pci_id, sizeof(pci_id), PCI_PRI_FMT,
540 dev->addr.domain, dev->addr.bus,
541 dev->addr.devid, dev->addr.function);
543 fp = fopen("/proc/ioports", "r");
545 RTE_LOG(ERR, EAL, "%s(): can't open ioports\n", __func__);
549 while (getdelim(&line, &linesz, '\n', fp) > 0) {
554 n = strcspn(ptr, ":");
558 while (*left && isspace(*left))
561 if (!strncmp(left, pci_id, strlen(pci_id))) {
564 while (*ptr && isspace(*ptr))
567 sscanf(ptr, "%04hx-%04hx", &start, &end);
579 dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
581 RTE_LOG(DEBUG, EAL, "PCI Port IO found start=0x%x\n", start);
588 rte_eal_pci_ioport_map(struct rte_pci_device *dev, int bar,
589 struct rte_pci_ioport *p)
596 if (pci_vfio_is_enabled())
597 ret = pci_vfio_ioport_map(dev, bar, p);
600 case RTE_KDRV_IGB_UIO:
601 ret = pci_uio_ioport_map(dev, bar, p);
603 case RTE_KDRV_UIO_GENERIC:
604 #if defined(RTE_ARCH_X86)
605 ret = pci_ioport_map(dev, bar, p);
607 ret = pci_uio_ioport_map(dev, bar, p);
611 #if defined(RTE_ARCH_X86)
612 ret = pci_ioport_map(dev, bar, p);
626 rte_eal_pci_ioport_read(struct rte_pci_ioport *p,
627 void *data, size_t len, off_t offset)
629 switch (p->dev->kdrv) {
632 pci_vfio_ioport_read(p, data, len, offset);
635 case RTE_KDRV_IGB_UIO:
636 pci_uio_ioport_read(p, data, len, offset);
638 case RTE_KDRV_UIO_GENERIC:
639 pci_uio_ioport_read(p, data, len, offset);
642 #if defined(RTE_ARCH_X86)
643 pci_uio_ioport_read(p, data, len, offset);
652 rte_eal_pci_ioport_write(struct rte_pci_ioport *p,
653 const void *data, size_t len, off_t offset)
655 switch (p->dev->kdrv) {
658 pci_vfio_ioport_write(p, data, len, offset);
661 case RTE_KDRV_IGB_UIO:
662 pci_uio_ioport_write(p, data, len, offset);
664 case RTE_KDRV_UIO_GENERIC:
665 pci_uio_ioport_write(p, data, len, offset);
668 #if defined(RTE_ARCH_X86)
669 pci_uio_ioport_write(p, data, len, offset);
678 rte_eal_pci_ioport_unmap(struct rte_pci_ioport *p)
682 switch (p->dev->kdrv) {
685 if (pci_vfio_is_enabled())
686 ret = pci_vfio_ioport_unmap(p);
689 case RTE_KDRV_IGB_UIO:
690 ret = pci_uio_ioport_unmap(p);
692 case RTE_KDRV_UIO_GENERIC:
693 #if defined(RTE_ARCH_X86)
696 ret = pci_uio_ioport_unmap(p);
700 #if defined(RTE_ARCH_X86)
711 /* Init the PCI EAL subsystem */
713 rte_eal_pci_init(void)
715 /* for debug purposes, PCI can be disabled */
716 if (internal_config.no_pci)
719 if (rte_eal_pci_scan() < 0) {
720 RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);