+
+static int
+bus_can_parse(const struct rte_bus *bus, const void *_name)
+{
+ const char *name = _name;
+
+ return !(bus->parse && bus->parse(name, NULL) == 0);
+}
+
+struct rte_bus *
+rte_bus_find_by_device_name(const char *str)
+{
+ char name[RTE_DEV_NAME_MAX_LEN];
+ char *c;
+
+ strlcpy(name, str, sizeof(name));
+ c = strchr(name, ',');
+ if (c != NULL)
+ c[0] = '\0';
+ return rte_bus_find(NULL, bus_can_parse, name);
+}
+
+
+/*
+ * Get iommu class of devices on the bus.
+ */
+enum rte_iova_mode
+rte_bus_get_iommu_class(void)
+{
+ enum rte_iova_mode mode = RTE_IOVA_DC;
+ bool buses_want_va = false;
+ bool buses_want_pa = false;
+ struct rte_bus *bus;
+
+ TAILQ_FOREACH(bus, &rte_bus_list, next) {
+ enum rte_iova_mode bus_iova_mode;
+
+ if (bus->get_iommu_class == NULL)
+ continue;
+
+ bus_iova_mode = bus->get_iommu_class();
+ RTE_LOG(DEBUG, EAL, "Bus %s wants IOVA as '%s'\n",
+ bus->name,
+ bus_iova_mode == RTE_IOVA_DC ? "DC" :
+ (bus_iova_mode == RTE_IOVA_PA ? "PA" : "VA"));
+ if (bus_iova_mode == RTE_IOVA_PA)
+ buses_want_pa = true;
+ else if (bus_iova_mode == RTE_IOVA_VA)
+ buses_want_va = true;
+ }
+ if (buses_want_va && !buses_want_pa) {
+ mode = RTE_IOVA_VA;
+ } else if (buses_want_pa && !buses_want_va) {
+ mode = RTE_IOVA_PA;
+ } else {
+ mode = RTE_IOVA_DC;
+ if (buses_want_va) {
+ RTE_LOG(WARNING, EAL, "Some buses want 'VA' but forcing 'DC' because other buses want 'PA'.\n");
+ RTE_LOG(WARNING, EAL, "Depending on the final decision by the EAL, not all buses may be able to initialize.\n");
+ }
+ }
+
+ return mode;
+}
+
+static int
+bus_handle_sigbus(const struct rte_bus *bus,
+ const void *failure_addr)
+{
+ int ret;
+
+ if (!bus->sigbus_handler)
+ return -1;
+
+ ret = bus->sigbus_handler(failure_addr);
+
+ /* find bus but handle failed, keep the errno be set. */
+ if (ret < 0 && rte_errno == 0)
+ rte_errno = ENOTSUP;
+
+ return ret > 0;
+}
+
+int
+rte_bus_sigbus_handler(const void *failure_addr)
+{
+ struct rte_bus *bus;
+
+ int ret = 0;
+ int old_errno = rte_errno;
+
+ rte_errno = 0;
+
+ bus = rte_bus_find(NULL, bus_handle_sigbus, failure_addr);
+ /* can not find bus. */
+ if (!bus)
+ return 1;
+ /* find bus but handle failed, pass on the new errno. */
+ else if (rte_errno != 0)
+ return -1;
+
+ /* restore the old errno. */
+ rte_errno = old_errno;
+
+ return ret;
+}