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35 #include <sys/queue.h>
38 #include <rte_debug.h>
39 #include <rte_string_fns.h>
40 #include <rte_errno.h>
42 #include "eal_private.h"
44 static struct rte_bus_list rte_bus_list =
45 TAILQ_HEAD_INITIALIZER(rte_bus_list);
48 rte_bus_register(struct rte_bus *bus)
51 RTE_VERIFY(bus->name && strlen(bus->name));
52 /* A bus should mandatorily have the scan implemented */
53 RTE_VERIFY(bus->scan);
54 RTE_VERIFY(bus->probe);
55 RTE_VERIFY(bus->find_device);
56 /* Buses supporting driver plug also require unplug. */
57 RTE_VERIFY(!bus->plug || bus->unplug);
59 TAILQ_INSERT_TAIL(&rte_bus_list, bus, next);
60 RTE_LOG(DEBUG, EAL, "Registered [%s] bus.\n", bus->name);
64 rte_bus_unregister(struct rte_bus *bus)
66 TAILQ_REMOVE(&rte_bus_list, bus, next);
67 RTE_LOG(DEBUG, EAL, "Unregistered [%s] bus.\n", bus->name);
70 /* Scan all the buses for registered devices */
75 struct rte_bus *bus = NULL;
77 TAILQ_FOREACH(bus, &rte_bus_list, next) {
80 RTE_LOG(ERR, EAL, "Scan for (%s) bus failed.\n",
87 /* Probe all devices of all buses */
92 struct rte_bus *bus, *vbus = NULL;
94 TAILQ_FOREACH(bus, &rte_bus_list, next) {
95 if (!strcmp(bus->name, "vdev")) {
102 RTE_LOG(ERR, EAL, "Bus (%s) probe failed.\n",
109 RTE_LOG(ERR, EAL, "Bus (%s) probe failed.\n",
116 /* Dump information of a single bus */
118 bus_dump_one(FILE *f, struct rte_bus *bus)
122 /* For now, dump only the bus name */
123 ret = fprintf(f, " %s\n", bus->name);
125 /* Error in case of inability in writing to stream */
133 rte_bus_dump(FILE *f)
138 TAILQ_FOREACH(bus, &rte_bus_list, next) {
139 ret = bus_dump_one(f, bus);
141 RTE_LOG(ERR, EAL, "Unable to write to stream (%d)\n",
149 rte_bus_find(const struct rte_bus *start, rte_bus_cmp_t cmp,
155 bus = TAILQ_NEXT(start, next);
157 bus = TAILQ_FIRST(&rte_bus_list);
158 while (bus != NULL) {
159 if (cmp(bus, data) == 0)
161 bus = TAILQ_NEXT(bus, next);
167 cmp_rte_device(const struct rte_device *dev1, const void *_dev2)
169 const struct rte_device *dev2 = _dev2;
175 bus_find_device(const struct rte_bus *bus, const void *_dev)
177 struct rte_device *dev;
179 dev = bus->find_device(NULL, cmp_rte_device, _dev);
184 rte_bus_find_by_device(const struct rte_device *dev)
186 return rte_bus_find(NULL, bus_find_device, (const void *)dev);
190 cmp_bus_name(const struct rte_bus *bus, const void *_name)
192 const char *name = _name;
194 return strcmp(bus->name, name);
198 rte_bus_find_by_name(const char *busname)
200 return rte_bus_find(NULL, cmp_bus_name, (const void *)busname);
204 bus_can_parse(const struct rte_bus *bus, const void *_name)
206 const char *name = _name;
208 return !(bus->parse && bus->parse(name, NULL) == 0);
212 rte_bus_find_by_device_name(const char *str)
214 char name[RTE_DEV_NAME_MAX_LEN];
217 strlcpy(name, str, sizeof(name));
218 c = strchr(name, ',');
221 return rte_bus_find(NULL, bus_can_parse, name);
226 * Get iommu class of devices on the bus.
229 rte_bus_get_iommu_class(void)
231 int mode = RTE_IOVA_DC;
234 TAILQ_FOREACH(bus, &rte_bus_list, next) {
236 if (bus->get_iommu_class)
237 mode |= bus->get_iommu_class();
240 if (mode != RTE_IOVA_VA) {
241 /* Use default IOVA mode */
248 bus_handle_sigbus(const struct rte_bus *bus,
249 const void *failure_addr)
253 if (!bus->sigbus_handler)
256 ret = bus->sigbus_handler(failure_addr);
258 /* find bus but handle failed, keep the errno be set. */
259 if (ret < 0 && rte_errno == 0)
266 rte_bus_sigbus_handler(const void *failure_addr)
271 int old_errno = rte_errno;
275 bus = rte_bus_find(NULL, bus_handle_sigbus, failure_addr);
276 /* can not find bus. */
279 /* find bus but handle failed, pass on the new errno. */
280 else if (rte_errno != 0)
283 /* restore the old errno. */
284 rte_errno = old_errno;