Imported Upstream version 17.05

[deb_dpdk.git] / lib / librte_eal / common / eal_common_bus.c

diff --git a/lib/librte_eal/common/eal_common_bus.c b/lib/librte_eal/common/eal_common_bus.c
new file mode 100644 (file)
index 0000000..8f9baf8
--- /dev/null
+++ b/lib/librte_eal/common/eal_common_bus.c
@@ -0,0 +1,147 @@
+/*-
+ *   BSD LICENSE
+ *
+ *   Copyright(c) 2016 NXP
+ *   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 NXP 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.
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <sys/queue.h>
+
+#include <rte_bus.h>
+
+#include "eal_private.h"
+
+struct rte_bus_list rte_bus_list =
+       TAILQ_HEAD_INITIALIZER(rte_bus_list);
+
+void
+rte_bus_register(struct rte_bus *bus)
+{
+       RTE_VERIFY(bus);
+       RTE_VERIFY(bus->name && strlen(bus->name));
+       /* A bus should mandatorily have the scan implemented */
+       RTE_VERIFY(bus->scan);
+       RTE_VERIFY(bus->probe);
+
+       TAILQ_INSERT_TAIL(&rte_bus_list, bus, next);
+       RTE_LOG(DEBUG, EAL, "Registered [%s] bus.\n", bus->name);
+}
+
+void
+rte_bus_unregister(struct rte_bus *bus)
+{
+       TAILQ_REMOVE(&rte_bus_list, bus, next);
+       RTE_LOG(DEBUG, EAL, "Unregistered [%s] bus.\n", bus->name);
+}
+
+/* Scan all the buses for registered devices */
+int
+rte_bus_scan(void)
+{
+       int ret;
+       struct rte_bus *bus = NULL;
+
+       TAILQ_FOREACH(bus, &rte_bus_list, next) {
+               ret = bus->scan();
+               if (ret) {
+                       RTE_LOG(ERR, EAL, "Scan for (%s) bus failed.\n",
+                               bus->name);
+                       return ret;
+               }
+       }
+
+       return 0;
+}
+
+/* Probe all devices of all buses */
+int
+rte_bus_probe(void)
+{
+       int ret;
+       struct rte_bus *bus, *vbus = NULL;
+
+       TAILQ_FOREACH(bus, &rte_bus_list, next) {
+               if (!strcmp(bus->name, "virtual")) {
+                       vbus = bus;
+                       continue;
+               }
+
+               ret = bus->probe();
+               if (ret) {
+                       RTE_LOG(ERR, EAL, "Bus (%s) probe failed.\n",
+                               bus->name);
+                       return ret;
+               }
+       }
+
+       if (vbus) {
+               ret = vbus->probe();
+               if (ret) {
+                       RTE_LOG(ERR, EAL, "Bus (%s) probe failed.\n",
+                               vbus->name);
+                       return ret;
+               }
+       }
+
+       return 0;
+}
+
+/* Dump information of a single bus */
+static int
+bus_dump_one(FILE *f, struct rte_bus *bus)
+{
+       int ret;
+
+       /* For now, dump only the bus name */
+       ret = fprintf(f, " %s\n", bus->name);
+
+       /* Error in case of inability in writing to stream */
+       if (ret < 0)
+               return ret;
+
+       return 0;
+}
+
+void
+rte_bus_dump(FILE *f)
+{
+       int ret;
+       struct rte_bus *bus;
+
+       TAILQ_FOREACH(bus, &rte_bus_list, next) {
+               ret = bus_dump_one(f, bus);
+               if (ret) {
+                       RTE_LOG(ERR, EAL, "Unable to write to stream (%d)\n",
+                               ret);
+                       break;
+               }
+       }
+}