-/*-
- * 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
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2010-2014 Intel Corporation
*/
-#include <stdlib.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <stdint.h>
-#include <inttypes.h>
+#include <unistd.h>
+#include <limits.h>
#include <string.h>
-#include <errno.h>
-#include <sys/queue.h>
+#include <dirent.h>
#include <rte_log.h>
-#include <rte_memory.h>
-#include <rte_memzone.h>
-#include <rte_launch.h>
-#include <rte_tailq.h>
#include <rte_eal.h>
-#include <rte_per_lcore.h>
#include <rte_lcore.h>
+#include <rte_common.h>
+#include <rte_string_fns.h>
#include <rte_debug.h>
#include "eal_private.h"
+#include "eal_filesystem.h"
+#include "eal_thread.h"
-#define PROC_CPUINFO "/proc/cpuinfo"
-#define PROC_PROCESSOR_FMT ""
+#define SYS_CPU_DIR "/sys/devices/system/cpu/cpu%u"
+#define CORE_ID_FILE "topology/core_id"
+#define NUMA_NODE_PATH "/sys/devices/system/node"
-/* parse one line and try to match "processor : %d". */
-static int
-parse_processor_id(const char *buf, unsigned *lcore_id)
-{
- static const char _processor[] = "processor";
- const char *s;
-
- if (strncmp(buf, _processor, sizeof(_processor) - 1) != 0)
- return -1;
-
- s = strchr(buf, ':');
- if (s == NULL)
- return -1;
-
- errno = 0;
- *lcore_id = strtoul(s+1, NULL, 10);
- if (errno != 0) {
- *lcore_id = -1;
- return -1;
- }
-
- return 0;
-}
-
-/* parse one line and try to match "physical id : %d". */
-static int
-parse_socket_id(const char *buf, unsigned *socket_id)
+/* Check if a cpu is present by the presence of the cpu information for it */
+int
+eal_cpu_detected(unsigned lcore_id)
{
- static const char _physical_id[] = "physical id";
- const char *s;
-
- if (strncmp(buf, _physical_id, sizeof(_physical_id) - 1) != 0)
- return -1;
-
- s = strchr(buf, ':');
- if (s == NULL)
- return -1;
-
- errno = 0;
- *socket_id = strtoul(s+1, NULL, 10);
- if (errno != 0)
- return -1;
-
- return 0;
+ char path[PATH_MAX];
+ int len = snprintf(path, sizeof(path), SYS_CPU_DIR
+ "/"CORE_ID_FILE, lcore_id);
+ if (len <= 0 || (unsigned)len >= sizeof(path))
+ return 0;
+ if (access(path, F_OK) != 0)
+ return 0;
+
+ return 1;
}
/*
- * Parse /proc/cpuinfo to get the number of physical and logical
- * processors on the machine. The function will fill the cpu_info
- * structure.
+ * Get CPU socket id (NUMA node) for a logical core.
+ *
+ * This searches each nodeX directories in /sys for the symlink for the given
+ * lcore_id and returns the numa node where the lcore is found. If lcore is not
+ * found on any numa node, returns zero.
*/
-int
-rte_eal_cpu_init(void)
+unsigned
+eal_cpu_socket_id(unsigned lcore_id)
{
- struct rte_config *config;
- FILE *f;
- char buf[BUFSIZ];
- unsigned lcore_id = 0;
- unsigned socket_id = 0;
- unsigned count = 0;
+ unsigned socket;
- /* get pointer to global configuration */
- config = rte_eal_get_configuration();
+ for (socket = 0; socket < RTE_MAX_NUMA_NODES; socket++) {
+ char path[PATH_MAX];
- /* open /proc/cpuinfo */
- f = fopen(PROC_CPUINFO, "r");
- if (f == NULL) {
- RTE_LOG(ERR, EAL, "%s(): Cannot find "PROC_CPUINFO"\n", __func__);
- return -1;
+ snprintf(path, sizeof(path), "%s/node%u/cpu%u", NUMA_NODE_PATH,
+ socket, lcore_id);
+ if (access(path, F_OK) == 0)
+ return socket;
}
+ return 0;
+}
- /*
- * browse lines of /proc/cpuinfo and fill memseg entries in
- * global configuration
- */
- while (fgets(buf, sizeof(buf), f) != NULL) {
-
- if (parse_processor_id(buf, &lcore_id) == 0)
- continue;
-
- if (parse_socket_id(buf, &socket_id) == 0)
- continue;
-
- if (buf[0] == '\n') {
- RTE_LOG(DEBUG, EAL, "Detected lcore %u on socket %u\n",
- lcore_id, socket_id);
- if (lcore_id >= RTE_MAX_LCORE) {
- RTE_LOG(DEBUG, EAL,
- "Skip lcore %u >= RTE_MAX_LCORE\n",
- lcore_id);
- continue;
- }
-
- /*
- * In a virtualization environment, the socket ID
- * reported by the system may not be linked to a real
- * physical socket ID, and may be incoherent. So in this
- * case, a default socket ID of 0 is assigned.
- */
- if (socket_id >= RTE_MAX_NUMA_NODES) {
-#ifdef CONFIG_RTE_EAL_ALLOW_INV_SOCKET_ID
- socket_id = 0;
-#else
- rte_panic("Socket ID (%u) is greater than "
- "RTE_MAX_NUMA_NODES (%d)\n",
- socket_id, RTE_MAX_NUMA_NODES);
-#endif
- }
-
- lcore_config[lcore_id].detected = 1;
- lcore_config[lcore_id].socket_id = socket_id;
-
- }
- }
-
- fclose(f);
-
- /* disable lcores that were not detected */
- RTE_LCORE_FOREACH(lcore_id) {
-
- if (lcore_config[lcore_id].detected == 0) {
- RTE_LOG(DEBUG, EAL, "Skip lcore %u (not detected)\n",
- lcore_id);
- config->lcore_role[lcore_id] = ROLE_OFF;
- }
- else
- count ++;
- }
-
- config->lcore_count = count;
-
+/* Get the cpu core id value from the /sys/.../cpuX core_id value */
+unsigned
+eal_cpu_core_id(unsigned lcore_id)
+{
+ char path[PATH_MAX];
+ unsigned long id;
+
+ int len = snprintf(path, sizeof(path), SYS_CPU_DIR "/%s", lcore_id, CORE_ID_FILE);
+ if (len <= 0 || (unsigned)len >= sizeof(path))
+ goto err;
+ if (eal_parse_sysfs_value(path, &id) != 0)
+ goto err;
+ return (unsigned)id;
+
+err:
+ RTE_LOG(ERR, EAL, "Error reading core id value from %s "
+ "for lcore %u - assuming core 0\n", SYS_CPU_DIR, lcore_id);
return 0;
}