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Diffstat (limited to 'lib/librte_eal/linuxapp/eal/eal_pci.c')
-rw-r--r--lib/librte_eal/linuxapp/eal/eal_pci.c770
1 files changed, 770 insertions, 0 deletions
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
new file mode 100644
index 0000000..78687d6
--- /dev/null
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -0,0 +1,770 @@
+/*-
+ * BSD LICENSE
+ *
+ * Copyright(c) 2010-2012 Intel Corporation. All rights reserved.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * version: DPDK.L.1.2.3-3
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <dirent.h>
+#include <limits.h>
+#include <sys/queue.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+
+#include <rte_interrupts.h>
+#include <rte_log.h>
+#include <rte_pci.h>
+#include <rte_common.h>
+#include <rte_launch.h>
+#include <rte_memory.h>
+#include <rte_memzone.h>
+#include <rte_tailq.h>
+#include <rte_eal.h>
+#include <rte_per_lcore.h>
+#include <rte_lcore.h>
+#include <rte_malloc.h>
+#include <rte_string_fns.h>
+#include <rte_debug.h>
+
+#include "eal_internal_cfg.h"
+#include "eal_private.h"
+
+/**
+ * @file
+ * PCI probing under linux
+ *
+ * This code is used to simulate a PCI probe by parsing information in
+ * sysfs. Moreover, when a registered driver matches a device, the
+ * kernel driver currently using it is unloaded and replaced by
+ * igb_uio module, which is a very minimal userland driver for Intel
+ * network card, only providing access to PCI BAR to applications, and
+ * enabling bus master.
+ */
+
+
+#define PROC_MODULES "/proc/modules"
+
+#define IGB_UIO_NAME "igb_uio"
+
+#define UIO_NEWID "/sys/bus/pci/drivers/%s/new_id"
+#define UIO_BIND "/sys/bus/pci/drivers/%s/bind"
+
+/* maximum time to wait that /dev/uioX appears */
+#define UIO_DEV_WAIT_TIMEOUT 3 /* seconds */
+
+/*
+ * For multi-process we need to reproduce all PCI mappings in secondary
+ * processes, so save them in a tailq.
+ */
+struct uio_resource {
+ TAILQ_ENTRY(uio_resource) next;
+
+ struct rte_pci_addr pci_addr;
+ void *addr;
+ char path[PATH_MAX];
+ unsigned long size;
+ unsigned long offset;
+};
+
+TAILQ_HEAD(uio_res_list, uio_resource);
+
+static struct uio_res_list *uio_res_list = NULL;
+static int pci_parse_sysfs_value(const char *filename, unsigned long *val);
+
+/*
+ * Check that a kernel module is loaded. Returns 0 on success, or if the
+ * parameter is NULL, or -1 if the module is not loaded.
+ */
+static int
+pci_uio_check_module(const char *module_name)
+{
+ FILE *f;
+ unsigned i;
+ char buf[BUFSIZ];
+
+ if (module_name == NULL)
+ return 0;
+
+ f = fopen(PROC_MODULES, "r");
+ if (f == NULL) {
+ RTE_LOG(ERR, EAL, "Cannot open "PROC_MODULES"\n");
+ return -1;
+ }
+
+ while(fgets(buf, sizeof(buf), f) != NULL) {
+
+ for (i = 0; i < sizeof(buf) && buf[i] != '\0'; i++) {
+ if (isspace(buf[i]))
+ buf[i] = '\0';
+ }
+
+ if (strncmp(buf, module_name, sizeof(buf)) == 0) {
+ fclose(f);
+ return 0;
+ }
+ }
+ fclose(f);
+ RTE_LOG(ERR, EAL, "Cannot find %s in "PROC_MODULES"\n", module_name);
+ return -1;
+}
+
+/* bind a PCI to the kernel module driver */
+static int
+pci_uio_bind_device(struct rte_pci_device *dev, const char *module_name)
+{
+ FILE *f;
+ int n;
+ char buf[BUFSIZ];
+ char uio_newid[PATH_MAX];
+ char uio_bind[PATH_MAX];
+ struct rte_pci_addr *loc = &dev->addr;
+
+ RTE_LOG(DEBUG, EAL, "bind PCI device "PCI_PRI_FMT" to %s driver\n",
+ loc->domain, loc->bus, loc->devid, loc->function, module_name);
+
+ n = rte_snprintf(uio_newid, sizeof(uio_newid), UIO_NEWID, module_name);
+ if ((n < 0) || (n >= (int)sizeof(uio_newid))) {
+ RTE_LOG(ERR, EAL, "Cannot rte_snprintf uio_newid name\n");
+ return -1;
+ }
+ n = rte_snprintf(uio_bind, sizeof(uio_bind), UIO_BIND, module_name);
+ if ((n < 0) || (n >= (int)sizeof(uio_bind))) {
+ RTE_LOG(ERR, EAL, "Cannot rte_snprintf uio_bind name\n");
+ return -1;
+ }
+
+ n = rte_snprintf(buf, sizeof(buf), "%x %x\n",
+ dev->id.vendor_id, dev->id.device_id);
+ if ((n < 0) || (n >= (int)sizeof(buf))) {
+ RTE_LOG(ERR, EAL, "Cannot rte_snprintf vendor_id/device_id\n");
+ return -1;
+ }
+
+ f = fopen(uio_newid, "w");
+ if (f == NULL) {
+ RTE_LOG(ERR, EAL, "Cannot open %s\n", uio_newid);
+ return -1;
+ }
+ if (fwrite(buf, n, 1, f) == 0) {
+ fclose(f);
+ return -1;
+ }
+ fclose(f);
+
+ f = fopen(uio_bind, "w");
+ if (f == NULL) {
+ RTE_LOG(ERR, EAL, "Cannot open %s\n", uio_bind);
+ return -1;
+ }
+ n = rte_snprintf(buf, sizeof(buf), PCI_PRI_FMT "\n",
+ loc->domain, loc->bus, loc->devid, loc->function);
+ if ((n < 0) || (n >= (int)sizeof(buf))) {
+ RTE_LOG(ERR, EAL, "Cannot rte_snprintf PCI infos\n");
+ fclose(f);
+ return -1;
+ }
+ if (fwrite(buf, n, 1, f) == 0) {
+ fclose(f);
+ return -1;
+ }
+
+ RTE_LOG(DEBUG, EAL, "Device bound\n");
+
+ fclose(f);
+ return 0;
+}
+
+/* map a particular resource from a file */
+static void *
+pci_map_resource(struct rte_pci_device *dev, void *requested_addr, const char *devname,
+ unsigned long offset, unsigned long size)
+{
+ unsigned n;
+ int fd;
+ void *mapaddr;
+
+ /*
+ * open devname, and mmap it: it can take some time to
+ * appear, so we wait some time before returning an error
+ */
+ for (n=0; n<UIO_DEV_WAIT_TIMEOUT*10; n++) {
+ fd = open(devname, O_RDWR);
+ if (fd >= 0)
+ break;
+ if (errno != ENOENT)
+ break;
+ usleep(100000);
+ }
+ if (fd < 0) {
+ RTE_LOG(ERR, EAL, "Cannot open %s: %s\n", devname, strerror(errno));
+ goto fail;
+ }
+
+ /* Map the PCI memory resource of device */
+ mapaddr = mmap(requested_addr, size, PROT_READ | PROT_WRITE,
+ MAP_SHARED, fd, offset);
+ if (mapaddr == MAP_FAILED ||
+ (requested_addr != NULL && mapaddr != requested_addr)) {
+ RTE_LOG(ERR, EAL, "%s(): cannot mmap %s: %s\n", __func__,
+ devname, strerror(errno));
+ close(fd);
+ goto fail;
+ }
+ if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
+ /* save fd if in primary process */
+ dev->intr_handle.fd = fd;
+ dev->intr_handle.type = RTE_INTR_HANDLE_UIO;
+ } else {
+ /* fd is not needed in slave process, close it */
+ dev->intr_handle.fd = -1;
+ dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+ close(fd);
+ }
+
+ RTE_LOG(DEBUG, EAL, "PCI memory mapped at %p\n", mapaddr);
+
+ return mapaddr;
+
+fail:
+ dev->intr_handle.fd = -1;
+ dev->intr_handle.type = RTE_INTR_HANDLE_UNKNOWN;
+
+ return NULL;
+}
+/* map the PCI resource of a PCI device in virtual memory */
+static int
+pci_uio_map_resource(struct rte_pci_device *dev)
+{
+ struct dirent *e;
+ DIR *dir;
+ char dirname[PATH_MAX];
+ char dirname2[PATH_MAX];
+ char filename[PATH_MAX];
+ char devname[PATH_MAX]; /* contains the /dev/uioX */
+ void *mapaddr;
+ unsigned uio_num;
+ unsigned long size, offset;
+ struct rte_pci_addr *loc = &dev->addr;
+ struct uio_resource *uio_res;
+
+ RTE_LOG(DEBUG, EAL, "map PCI resource for device "PCI_PRI_FMT"\n",
+ loc->domain, loc->bus, loc->devid, loc->function);
+
+ /* secondary processes - use already recorded details */
+ if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
+
+ TAILQ_FOREACH(uio_res, uio_res_list, next) {
+ /* skip this element if it doesn't match our PCI address */
+ if (memcmp(&uio_res->pci_addr, &dev->addr, sizeof(dev->addr)))
+ continue;
+
+ if (pci_map_resource(dev, uio_res->addr, uio_res->path, \
+ uio_res->offset, uio_res->size) == uio_res->addr)
+ return 0;
+ else {
+ RTE_LOG(ERR, EAL, "Cannot mmap device resource\n");
+ return -1;
+ }
+ }
+ RTE_LOG(ERR, EAL, "Cannot find resource for device\n");
+ return -1;
+ }
+
+ /* depending on kernel version, uio can be located in uio/uioX
+ * or uio:uioX */
+
+ rte_snprintf(dirname, sizeof(dirname),
+ "/sys/bus/pci/devices/" PCI_PRI_FMT "/uio",
+ loc->domain, loc->bus, loc->devid, loc->function);
+
+ dir = opendir(dirname);
+ if (dir == NULL) {
+ /* retry with the parent directory */
+ rte_snprintf(dirname, sizeof(dirname),
+ "/sys/bus/pci/devices/" PCI_PRI_FMT,
+ loc->domain, loc->bus, loc->devid, loc->function);
+ dir = opendir(dirname);
+
+ if (dir == NULL) {
+ RTE_LOG(ERR, EAL, "Cannot opendir %s\n", dirname);
+ return -1;
+ }
+ }
+
+ /* take the first file starting with "uio" */
+ while ((e = readdir(dir)) != NULL) {
+ int shortprefix_len = sizeof("uio") - 1; /* format could be uio%d ...*/
+ int longprefix_len = sizeof("uio:uio") - 1; /* ... or uio:uio%d */
+ char *endptr;
+
+ if (strncmp(e->d_name, "uio", 3) != 0)
+ continue;
+
+ /* first try uio%d */
+ errno = 0;
+ uio_num = strtoull(e->d_name + shortprefix_len, &endptr, 10);
+ if (errno == 0 && endptr != e->d_name) {
+ rte_snprintf(dirname2, sizeof(dirname2),
+ "%s/uio%u", dirname, uio_num);
+ break;
+ }
+
+ /* then try uio:uio%d */
+ errno = 0;
+ uio_num = strtoull(e->d_name + longprefix_len, &endptr, 10);
+ if (errno == 0 && endptr != e->d_name) {
+ rte_snprintf(dirname2, sizeof(dirname2),
+ "%s/uio:uio%u", dirname, uio_num);
+ break;
+ }
+ }
+ closedir(dir);
+
+ /* No uio resource found */
+ if (e == NULL)
+ return 0;
+
+ /* get mapping offset */
+ rte_snprintf(filename, sizeof(filename),
+ "%s/maps/map0/offset", dirname2);
+ if (pci_parse_sysfs_value(filename, &offset) < 0) {
+ RTE_LOG(ERR, EAL, "%s(): cannot parse offset\n",
+ __func__);
+ return -1;
+ }
+
+ /* get mapping size */
+ rte_snprintf(filename, sizeof(filename),
+ "%s/maps/map0/size", dirname2);
+ if (pci_parse_sysfs_value(filename, &size) < 0) {
+ RTE_LOG(ERR, EAL, "%s(): cannot parse size\n",
+ __func__);
+ return -1;
+ }
+
+ /* open and mmap /dev/uioX */
+ rte_snprintf(devname, sizeof(devname), "/dev/uio%u", uio_num);
+ mapaddr = pci_map_resource(dev, NULL, devname, offset, size);
+ if (mapaddr == NULL)
+ return -1;
+ dev->mem_resource.addr = mapaddr;
+
+ /* save the mapping details for secondary processes*/
+ uio_res = rte_malloc("UIO_RES", sizeof(*uio_res), 0);
+ if (uio_res == NULL){
+ RTE_LOG(ERR, EAL, "%s(): cannot store uio mmap details\n", __func__);
+ return -1;
+ }
+ uio_res->addr = mapaddr;
+ uio_res->offset = offset;
+ uio_res->size = size;
+ rte_snprintf(uio_res->path, sizeof(uio_res->path), "%s", devname);
+ memcpy(&uio_res->pci_addr, &dev->addr, sizeof(uio_res->pci_addr));
+
+ TAILQ_INSERT_TAIL(uio_res_list, uio_res, next);
+
+ return 0;
+}
+
+/* parse the "resource" sysfs file */
+#define IORESOURCE_MEM 0x00000200
+
+static int
+pci_parse_sysfs_resource(const char *filename, struct rte_pci_device *dev)
+{
+ FILE *f;
+ char buf[BUFSIZ];
+ union pci_resource_info {
+ struct {
+ char *phys_addr;
+ char *end_addr;
+ char *flags;
+ };
+ char *ptrs[PCI_RESOURCE_FMT_NVAL];
+ } res_info;
+ int i;
+ uint64_t phys_addr, end_addr, flags;
+
+ f = fopen(filename, "r");
+ if (f == NULL) {
+ RTE_LOG(ERR, EAL, "Cannot open sysfs resource\n");
+ return -1;
+ }
+
+ for (i = 0; i<PCI_MAX_RESOURCE; i++) {
+
+ if (fgets(buf, sizeof(buf), f) == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): cannot read resource\n", __func__);
+ goto error;
+ }
+
+ if (rte_strsplit(buf, sizeof(buf), res_info.ptrs, 3, ' ') != 3) {
+ RTE_LOG(ERR, EAL, "%s(): bad resource format\n", __func__);
+ goto error;
+ }
+ errno = 0;
+ phys_addr = strtoull(res_info.phys_addr, NULL, 16);
+ end_addr = strtoull(res_info.end_addr, NULL, 16);
+ flags = strtoull(res_info.flags, NULL, 16);
+ if (errno != 0) {
+ RTE_LOG(ERR, EAL, "%s(): bad resource format\n", __func__);
+ goto error;
+ }
+
+ if (flags & IORESOURCE_MEM) {
+ dev->mem_resource.phys_addr = phys_addr;
+ dev->mem_resource.len = end_addr - phys_addr + 1;
+ dev->mem_resource.addr = NULL; /* not mapped for now */
+ break;
+ }
+ }
+ fclose(f);
+ return 0;
+
+error:
+ fclose(f);
+ return -1;
+}
+
+/* parse a sysfs file containing one integer value */
+static int
+pci_parse_sysfs_value(const char *filename, unsigned long *val)
+{
+ FILE *f;
+ char buf[BUFSIZ];
+ char *end = NULL;
+
+ f = fopen(filename, "r");
+ if (f == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): cannot open sysfs value %s\n",
+ __func__, filename);
+ return -1;
+ }
+
+ if (fgets(buf, sizeof(buf), f) == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): cannot read sysfs value %s\n",
+ __func__, filename);
+ fclose(f);
+ return -1;
+ }
+ *val = strtoul(buf, &end, 0);
+ if ((buf[0] == '\0') || (end == NULL) || (*end != '\n')) {
+ RTE_LOG(ERR, EAL, "%s(): cannot parse sysfs value %s\n",
+ __func__, filename);
+ fclose(f);
+ return -1;
+ }
+ fclose(f);
+ return 0;
+}
+
+/* Scan one pci sysfs entry, and fill the devices list from it. */
+static int
+pci_scan_one(const char *dirname, uint16_t domain, uint8_t bus,
+ uint8_t devid, uint8_t function)
+{
+ char filename[PATH_MAX];
+ unsigned long tmp;
+ struct rte_pci_device *dev;
+
+ dev = malloc(sizeof(*dev));
+ if (dev == NULL) {
+ return -1;
+ }
+
+ memset(dev, 0, sizeof(*dev));
+ dev->addr.domain = domain;
+ dev->addr.bus = bus;
+ dev->addr.devid = devid;
+ dev->addr.function = function;
+
+ /* get vendor id */
+ rte_snprintf(filename, sizeof(filename), "%s/vendor", dirname);
+ if (pci_parse_sysfs_value(filename, &tmp) < 0) {
+ free(dev);
+ return -1;
+ }
+ dev->id.vendor_id = (uint16_t)tmp;
+
+ /* get device id */
+ rte_snprintf(filename, sizeof(filename), "%s/device", dirname);
+ if (pci_parse_sysfs_value(filename, &tmp) < 0) {
+ free(dev);
+ return -1;
+ }
+ dev->id.device_id = (uint16_t)tmp;
+
+ /* get subsystem_vendor id */
+ rte_snprintf(filename, sizeof(filename), "%s/subsystem_vendor",
+ dirname);
+ if (pci_parse_sysfs_value(filename, &tmp) < 0) {
+ free(dev);
+ return -1;
+ }
+ dev->id.subsystem_vendor_id = (uint16_t)tmp;
+
+ /* get subsystem_device id */
+ rte_snprintf(filename, sizeof(filename), "%s/subsystem_device",
+ dirname);
+ if (pci_parse_sysfs_value(filename, &tmp) < 0) {
+ free(dev);
+ return -1;
+ }
+ dev->id.subsystem_device_id = (uint16_t)tmp;
+
+ /* parse resources */
+ rte_snprintf(filename, sizeof(filename), "%s/resource", dirname);
+ if (pci_parse_sysfs_resource(filename, dev) < 0) {
+ RTE_LOG(ERR, EAL, "%s(): cannot parse resource\n", __func__);
+ free(dev);
+ return -1;
+ }
+
+ /* device is valid, add in list */
+ TAILQ_INSERT_TAIL(&device_list, dev, next);
+
+ return 0;
+}
+
+/*
+ * split up a pci address into its constituent parts.
+ */
+static int
+parse_pci_addr_format(const char *buf, int bufsize, uint16_t *domain,
+ uint8_t *bus, uint8_t *devid, uint8_t *function)
+{
+ /* first split on ':' */
+ union splitaddr {
+ struct {
+ char *domain;
+ char *bus;
+ char *devid;
+ char *function;
+ };
+ char *str[PCI_FMT_NVAL]; /* last element-separator is "." not ":" */
+ } splitaddr;
+
+ char *buf_copy = strndup(buf, bufsize);
+ if (buf_copy == NULL)
+ return -1;
+
+ if (rte_strsplit(buf_copy, bufsize, splitaddr.str, PCI_FMT_NVAL, ':')
+ != PCI_FMT_NVAL - 1)
+ goto error;
+ /* final split is on '.' between devid and function */
+ splitaddr.function = strchr(splitaddr.devid,'.');
+ if (splitaddr.function == NULL)
+ goto error;
+ *splitaddr.function++ = '\0';
+
+ /* now convert to int values */
+ errno = 0;
+ *domain = (uint8_t)strtoul(splitaddr.domain, NULL, 16);
+ *bus = (uint8_t)strtoul(splitaddr.bus, NULL, 16);
+ *devid = (uint8_t)strtoul(splitaddr.devid, NULL, 16);
+ *function = (uint8_t)strtoul(splitaddr.function, NULL, 10);
+ if (errno != 0)
+ goto error;
+
+ free(buf_copy); /* free the copy made with strdup */
+ return 0;
+error:
+ free(buf_copy);
+ return -1;
+}
+
+/*
+ * Scan the content of the PCI bus, and the devices in the devices
+ * list
+ */
+static int
+pci_scan(void)
+{
+ struct dirent *e;
+ DIR *dir;
+ char dirname[PATH_MAX];
+ uint16_t domain;
+ uint8_t bus, devid, function;
+
+ dir = opendir(SYSFS_PCI_DEVICES);
+ if (dir == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): opendir failed: %s\n",
+ __func__, strerror(errno));
+ return -1;
+ }
+
+ while ((e = readdir(dir)) != NULL) {
+ if (e->d_name[0] == '.')
+ continue;
+
+ if (parse_pci_addr_format(e->d_name, sizeof(e->d_name), &domain,
+ &bus, &devid, &function) != 0)
+ continue;
+
+ rte_snprintf(dirname, sizeof(dirname), "%s/%s", SYSFS_PCI_DEVICES,
+ e->d_name);
+ if (pci_scan_one(dirname, domain, bus, devid, function) < 0)
+ goto error;
+ }
+ closedir(dir);
+ return 0;
+
+error:
+ closedir(dir);
+ return -1;
+}
+
+/* unbind kernel driver for this device */
+static int
+pci_unbind_kernel_driver(struct rte_pci_device *dev)
+{
+ int n;
+ FILE *f;
+ char filename[PATH_MAX];
+ char buf[BUFSIZ];
+ struct rte_pci_addr *loc = &dev->addr;
+
+ /* open /sys/bus/pci/devices/AAAA:BB:CC.D/driver */
+ rte_snprintf(filename, sizeof(filename),
+ SYSFS_PCI_DEVICES "/" PCI_PRI_FMT "/driver/unbind",
+ loc->domain, loc->bus, loc->devid, loc->function);
+
+ RTE_LOG(DEBUG, EAL, "unbind kernel driver %s\n", filename);
+
+ f = fopen(filename, "w");
+ if (f == NULL) /* device was not bound */
+ return 0;
+
+ n = rte_snprintf(buf, sizeof(buf), PCI_PRI_FMT "\n",
+ loc->domain, loc->bus, loc->devid, loc->function);
+ if ((n < 0) || (n >= (int)sizeof(buf))) {
+ RTE_LOG(ERR, EAL, "%s(): rte_snprintf failed\n", __func__);
+ goto error;
+ }
+ if (fwrite(buf, n, 1, f) == 0)
+ goto error;
+
+ fclose(f);
+ return 0;
+
+error:
+ fclose(f);
+ return -1;
+}
+
+/*
+ * If vendor/device ID match, call the devinit() function of the
+ * driver.
+ */
+int
+rte_eal_pci_probe_one_driver(struct rte_pci_driver *dr, struct rte_pci_device *dev)
+{
+ struct rte_pci_id *id_table;
+ const char *module_name = NULL;
+ int ret;
+
+ if (dr->drv_flags & RTE_PCI_DRV_NEED_IGB_UIO)
+ module_name = IGB_UIO_NAME;
+
+ ret = pci_uio_check_module(module_name);
+ if (ret != 0)
+ rte_exit(1, "The %s module is required by the %s driver\n",
+ module_name, dr->name);
+
+ for (id_table = dr->id_table ; id_table->vendor_id != 0; id_table++) {
+
+ /* check if device's identifiers match the driver's ones */
+ if (id_table->vendor_id != dev->id.vendor_id &&
+ id_table->vendor_id != PCI_ANY_ID)
+ continue;
+ if (id_table->device_id != dev->id.device_id &&
+ id_table->device_id != PCI_ANY_ID)
+ continue;
+ if (id_table->subsystem_vendor_id != dev->id.subsystem_vendor_id &&
+ id_table->subsystem_vendor_id != PCI_ANY_ID)
+ continue;
+ if (id_table->subsystem_device_id != dev->id.subsystem_device_id &&
+ id_table->subsystem_device_id != PCI_ANY_ID)
+ continue;
+
+ RTE_LOG(DEBUG, EAL, "probe driver: %x:%x %s\n",
+ dev->id.vendor_id, dev->id.device_id, dr->name);
+
+ /* Unbind PCI devices if needed */
+ if (module_name != NULL) {
+ if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
+ /* unbind current driver, bind ours */
+ if (pci_unbind_kernel_driver(dev) < 0)
+ return -1;
+ if (pci_uio_bind_device(dev, module_name) < 0)
+ return -1;
+ }
+ /* map the NIC resources */
+ if (pci_uio_map_resource(dev) < 0)
+ return -1;
+ }
+ /* call the driver devinit() function */
+ return dr->devinit(dr, dev);
+
+ }
+ return -1;
+}
+
+/* Init the PCI EAL subsystem */
+int
+rte_eal_pci_init(void)
+{
+ TAILQ_INIT(&driver_list);
+ TAILQ_INIT(&device_list);
+ uio_res_list = RTE_TAILQ_RESERVE("PCI_RESOURCE_LIST", uio_res_list);
+
+ /* for debug purposes, PCI can be disabled */
+ if (internal_config.no_pci)
+ return 0;
+
+ if (pci_scan() < 0) {
+ RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);
+ return -1;
+ }
+ return 0;
+}