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Diffstat (limited to 'lib/librte_eal/linuxapp/eal/eal_hugepage_info.c')
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diff --git a/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c b/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c
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+++ b/lib/librte_eal/linuxapp/eal/eal_hugepage_info.c
@@ -0,0 +1,229 @@
+/*-
+ * 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 <string.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <inttypes.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <sys/queue.h>
+
+#include "rte_memory.h"
+#include "rte_memzone.h"
+#include "rte_tailq.h"
+#include "rte_eal.h"
+#include "rte_launch.h"
+#include "rte_per_lcore.h"
+#include "rte_lcore.h"
+#include "rte_debug.h"
+#include "rte_log.h"
+#include "rte_common.h"
+#include "rte_string_fns.h"
+#include "eal_internal_cfg.h"
+#include "eal_hugepages.h"
+
+static const char sys_dir_path[] = "/sys/kernel/mm/hugepages";
+
+static int32_t
+get_num_hugepages(const char *subdir)
+{
+ const char nr_hp_file[] = "nr_hugepages";
+ char path[BUFSIZ];
+ unsigned num_pages = 0;
+
+ rte_snprintf(path, sizeof(path), "%s/%s/%s",
+ sys_dir_path, subdir, nr_hp_file);
+ FILE *fd = fopen(path, "r");
+ if (fd == NULL || fscanf(fd, "%u", &num_pages) != 1)
+ rte_panic("Error reading file '%s'\n", path);
+ fclose(fd);
+
+ return num_pages;
+}
+
+static uint64_t
+get_default_hp_size(void)
+{
+ const char proc_meminfo[] = "/proc/meminfo";
+ const char str_hugepagesz[] = "Hugepagesize:";
+ unsigned hugepagesz_len = sizeof(str_hugepagesz) - 1;
+ char buffer[256];
+ unsigned long long size = 0;
+
+ FILE *fd = fopen(proc_meminfo, "r");
+ if (fd == NULL)
+ rte_panic("Cannot open %s\n", proc_meminfo);
+ while(fgets(buffer, sizeof(buffer), fd)){
+ if (strncmp(buffer, str_hugepagesz, hugepagesz_len) == 0){
+ size = rte_str_to_size(&buffer[hugepagesz_len]);
+ break;
+ }
+ }
+ fclose(fd);
+ if (size == 0)
+ rte_panic("Cannot get default hugepage size from %s\n", proc_meminfo);
+ return size;
+}
+
+static const char *
+get_hugepage_dir(uint64_t hugepage_sz)
+{
+ enum proc_mount_fieldnames {
+ DEVICE = 0,
+ MOUNTPT,
+ FSTYPE,
+ OPTIONS,
+ _FIELDNAME_MAX
+ };
+ static uint64_t default_size = 0;
+ const char proc_mounts[] = "/proc/mounts";
+ const char hugetlbfs_str[] = "hugetlbfs";
+ const size_t htlbfs_str_len = sizeof(hugetlbfs_str) - 1;
+ const char pagesize_opt[] = "pagesize=";
+ const size_t pagesize_opt_len = sizeof(pagesize_opt) - 1;
+ const char split_tok = ' ';
+ char *splitstr[_FIELDNAME_MAX];
+ char buf[BUFSIZ];
+ char *retval = NULL;
+
+ FILE *fd = fopen(proc_mounts, "r");
+ if (fd == NULL)
+ rte_panic("Cannot open %s\n", proc_mounts);
+
+ if (default_size == 0)
+ default_size = get_default_hp_size();
+
+ while (fgets(buf, sizeof(buf), fd)){
+ if (rte_strsplit(buf, sizeof(buf), splitstr, _FIELDNAME_MAX,
+ split_tok) != _FIELDNAME_MAX) {
+ RTE_LOG(ERR, EAL, "Error parsing %s\n", proc_mounts);
+ break; /* return NULL */
+ }
+
+ /* we have a specified --huge-dir option, only examine that dir */
+ if (internal_config.hugepage_dir != NULL &&
+ strcmp(splitstr[MOUNTPT], internal_config.hugepage_dir) != 0)
+ continue;
+
+ if (strncmp(splitstr[FSTYPE], hugetlbfs_str, htlbfs_str_len) == 0){
+ const char *pagesz_str = strstr(splitstr[OPTIONS], pagesize_opt);
+
+ /* if no explicit page size, the default page size is compared */
+ if (pagesz_str == NULL){
+ if (hugepage_sz == default_size){
+ retval = strdup(splitstr[MOUNTPT]);
+ break;
+ }
+ }
+ /* there is an explicit page size, so check it */
+ else {
+ uint64_t pagesz = rte_str_to_size(&pagesz_str[pagesize_opt_len]);
+ if (pagesz == hugepage_sz) {
+ retval = strdup(splitstr[MOUNTPT]);
+ break;
+ }
+ }
+ } /* end if strncmp hugetlbfs */
+ } /* end while fgets */
+
+ fclose(fd);
+ return retval;
+}
+
+static inline void
+swap_hpi(struct hugepage_info *a, struct hugepage_info *b)
+{
+ char buf[sizeof(*a)];
+ memcpy(buf, a, sizeof(*a));
+ memcpy(a, b, sizeof(*a));
+ memcpy(b, buf, sizeof(*a));
+}
+
+int
+eal_hugepage_info_init(void)
+{
+ const char dirent_start_text[] = "hugepages-";
+ const size_t dirent_start_len = sizeof(dirent_start_text) - 1;
+ unsigned i, num_sizes = 0;
+
+ DIR *dir = opendir(sys_dir_path);
+ if (dir == NULL)
+ rte_panic("Cannot open directory %s to read system hugepage info\n",
+ sys_dir_path);
+
+ struct dirent *dirent = readdir(dir);
+ while(dirent != NULL){
+ if (strncmp(dirent->d_name, dirent_start_text, dirent_start_len) == 0){
+ struct hugepage_info *hpi = \
+ &internal_config.hugepage_info[num_sizes];
+ hpi->hugepage_sz = rte_str_to_size(&dirent->d_name[dirent_start_len]);
+ hpi->num_pages = get_num_hugepages(dirent->d_name);
+ hpi->hugedir = get_hugepage_dir(hpi->hugepage_sz);
+ if (hpi->hugedir == NULL){
+ RTE_LOG(INFO, EAL, "%u hugepages of size %llu reserved, "\
+ "but no mounted hugetlbfs found for that size\n",
+ hpi->num_pages,
+ (unsigned long long)hpi->hugepage_sz);
+ hpi->num_pages = 0;
+ } else
+ num_sizes++;
+ }
+ dirent = readdir(dir);
+ }
+ closedir(dir);
+ internal_config.num_hugepage_sizes = num_sizes;
+
+ /* sort the page directory entries by size, largest to smallest */
+ for (i = 0; i < num_sizes; i++){
+ unsigned j;
+ for (j = i+1; j < num_sizes; j++)
+ if (internal_config.hugepage_info[j-1].hugepage_sz < \
+ internal_config.hugepage_info[j].hugepage_sz)
+ swap_hpi(&internal_config.hugepage_info[j-1],
+ &internal_config.hugepage_info[j]);
+ }
+
+ /* now we have all info, check we have at least one valid size */
+ for (i = 0; i < num_sizes; i++)
+ if (internal_config.hugepage_info[i].hugedir != NULL &&
+ internal_config.hugepage_info[i].num_pages > 0)
+ return 0;
+ /* no valid hugepage mounts available, return error */
+ return -1;
+}