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/*
* Copyright (C) 2013-2014 Red Hat, Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors: Peter Schiffer <pschiffe@redhat.com>
*/
#ifndef SYSFS_H_
#define SYSFS_H_
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "utils.h"
#include "dmidecode.h"
#include "lscpu.h"
#define SYSFS_PATH "/sys/devices/system"
#define SYSFS_CPU_PATH SYSFS_PATH "/cpu"
#define SYSFS_KERNEL_MM "/sys/kernel/mm"
#define SYSFS_BLOCK_PATH "/sys/class/block"
/* Transparent memory huge pages statuses. */
typedef enum _ThpStatus {
thp_unsupported = 0,
thp_never,
thp_madvise,
thp_always
} ThpStatus;
/* Processor cache from sysfs. */
typedef struct _SysfsCpuCache {
char *id; /* ID */
unsigned size; /* Cache Size */
char *name; /* Cache Name */
unsigned level; /* Cache Level */
char *type; /* Cache Type (Data, Instruction, Unified..) */
unsigned ways_of_assoc; /* Number of ways of associativity */
unsigned line_size; /* Cache Line Size */
} SysfsCpuCache;
/*
* Read unsigned value from file.
* @param path of file
* @param result
* @return 0 if success, negative value otherwise
*/
short path_get_unsigned(const char *path, unsigned *result);
/*
* Read string value from file.
* @param path of file
* @param result
* @return 0 if success, negative value otherwise
*/
short path_get_string(const char *path, char **result);
/*
* Get array of processor caches from sysfs.
* @param caches array of cpu caches, this function will allocate necessary
* memory, but caller is responsible for freeing it
* @param caches_nb number of caches in caches
* @return 0 if success, negative value otherwise
*/
short sysfs_get_cpu_caches(SysfsCpuCache **caches, unsigned *caches_nb);
/*
* Free array of cpu cache structures.
* @param caches array of caches
* @param caches_nb number of caches
*/
void sysfs_free_cpu_caches(SysfsCpuCache **caches, unsigned *caches_nb);
/*
* Detects whether system has NUMA memory layout.
* @return 0 if no, 1 if yes
*/
short sysfs_has_numa();
/*
* Get all supported sizes of memory huge pages in kB
* @param sizes array of all supported sizes if huge pages
* @param sizes_nb number of items in array
* @return 0 if success, negative value otherwise
*/
short sysfs_get_sizes_of_hugepages(unsigned **sizes, unsigned *sizes_nb);
/*
* Get current status of transparent memory huge pages.
* @return ThpStatus
*/
ThpStatus sysfs_get_transparent_hugepages_status();
#endif /* SYSFS_H_ */
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