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Diffstat (limited to 'sys-utils/chmem.c')
| -rw-r--r-- | sys-utils/chmem.c | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/sys-utils/chmem.c b/sys-utils/chmem.c new file mode 100644 index 000000000..cc681b84c --- /dev/null +++ b/sys-utils/chmem.c @@ -0,0 +1,325 @@ +/* + * chmem - Memory configuration tool + * + * Copyright IBM Corp. 2016 + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it would be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <getopt.h> +#include <assert.h> +#include <dirent.h> + +#include <c.h> +#include <nls.h> +#include <path.h> +#include <strutils.h> +#include <strv.h> +#include <optutils.h> +#include <closestream.h> +#include <xalloc.h> + +/* partial success, otherwise we return regular EXIT_{SUCCESS,FAILURE} */ +#define CHMEM_EXIT_SOMEOK 64 + +#define _PATH_SYS_MEMORY "/sys/devices/system/memory" +#define _PATH_SYS_MEMORY_BLOCK_SIZE _PATH_SYS_MEMORY "/block_size_bytes" + +struct chmem_desc { + struct dirent **dirs; + int ndirs; + uint64_t block_size; + uint64_t start; + uint64_t end; + uint64_t size; + unsigned int use_blocks : 1; + unsigned int is_size : 1; + unsigned int verbose : 1; +}; + +enum { + CMD_MEMORY_ENABLE = 0, + CMD_MEMORY_DISABLE, + CMD_NONE +}; + +static void idxtostr(struct chmem_desc *desc, uint64_t idx, char *buf, size_t bufsz) +{ + uint64_t start, end; + + start = idx * desc->block_size; + end = start + desc->block_size - 1; + snprintf(buf, bufsz, + _("Memory Block %"SCNu64" (0x%016"PRIx64"-0x%016"PRIx64")"), + idx, start, end); +} + +static int chmem_size(struct chmem_desc *desc, int enable) +{ + char *name, *onoff, line[BUFSIZ], str[BUFSIZ]; + uint64_t size, index; + int i, rc; + + size = desc->size; + onoff = enable ? "online" : "offline"; + i = enable ? 0 : desc->ndirs - 1; + for (; i >= 0 && i < desc->ndirs && size; i += enable ? 1 : -1) { + name = desc->dirs[i]->d_name; + index = strtou64_or_err(name + 6, _("Failed to parse index")); + path_read_str(line, sizeof(line), _PATH_SYS_MEMORY "/%s/state", name); + if (strcmp(onoff, line) == 0) + continue; + idxtostr(desc, index, str, sizeof(str)); + rc = path_write_str(onoff, _PATH_SYS_MEMORY"/%s/state", name); + if (rc == -1 && desc->verbose) { + if (enable) + fprintf(stdout, _("%s enable failed\n"), str); + else + fprintf(stdout, _("%s disable failed\n"), str); + } else if (rc == 0 && desc->verbose) { + if (enable) + fprintf(stdout, _("%s enabled\n"), str); + else + fprintf(stdout, _("%s disabled\n"), str); + } + if (rc == 0) + size--; + } + if (size) { + uint64_t bytes; + char *sizestr; + + bytes = (desc->size - size) * desc->block_size; + sizestr = size_to_human_string(SIZE_SUFFIX_1LETTER, bytes); + if (enable) + warnx(_("Could only enable %s of memory"), sizestr); + else + warnx(_("Could only disable %s of memory"), sizestr); + free(sizestr); + } + return size == 0 ? 0 : size == desc->size ? -1 : 1; +} + +static int chmem_range(struct chmem_desc *desc, int enable) +{ + char *name, *onoff, line[BUFSIZ], str[BUFSIZ]; + uint64_t index, todo; + int i, rc; + + todo = desc->end - desc->start + 1; + onoff = enable ? "online" : "offline"; + for (i = 0; i < desc->ndirs; i++) { + name = desc->dirs[i]->d_name; + index = strtou64_or_err(name + 6, _("Failed to parse index")); + if (index < desc->start) + continue; + if (index > desc->end) + break; + idxtostr(desc, index, str, sizeof(str)); + path_read_str(line, sizeof(line), _PATH_SYS_MEMORY "/%s/state", name); + if (strcmp(onoff, line) == 0) { + if (desc->verbose && enable) + fprintf(stdout, _("%s already enabled\n"), str); + else if (desc->verbose && !enable) + fprintf(stdout, _("%s already disabled\n"), str); + todo--; + continue; + } + rc = path_write_str(onoff, _PATH_SYS_MEMORY"/%s/state", name); + if (rc == -1) { + if (enable) + warn(_("%s enable failed"), str); + else + warn(_("%s disable failed"), str); + } else if (desc->verbose) { + if (enable) + fprintf(stdout, _("%s enabled\n"), str); + else + fprintf(stdout, _("%s disabled\n"), str); + } + if (rc == 0) + todo--; + } + return todo == 0 ? 0 : todo == desc->end - desc->start + 1 ? -1 : 1; +} + +static int filter(const struct dirent *de) +{ + if (strncmp("memory", de->d_name, 6)) + return 0; + return isdigit_string(de->d_name + 6); +} + +static void read_info(struct chmem_desc *desc) +{ + char line[BUFSIZ]; + + desc->ndirs = scandir(_PATH_SYS_MEMORY, &desc->dirs, filter, versionsort); + if (desc->ndirs <= 0) + err(EXIT_FAILURE, _("Failed to read %s"), _PATH_SYS_MEMORY); + path_read_str(line, sizeof(line), _PATH_SYS_MEMORY_BLOCK_SIZE); + desc->block_size = strtoumax(line, NULL, 16); +} + +static void parse_single_param(struct chmem_desc *desc, char *str) +{ + if (desc->use_blocks) { + desc->start = strtou64_or_err(str, _("Failed to parse block number")); + desc->end = desc->start; + return; + } + desc->is_size = 1; + desc->size = strtosize_or_err(str, _("Failed to parse size")); + if (isdigit(str[strlen(str) - 1])) + desc->size *= 1024*1024; + if (desc->size % desc->block_size) { + errx(EXIT_FAILURE, _("Size must be aligned to memory block size (%s)"), + size_to_human_string(SIZE_SUFFIX_1LETTER, desc->block_size)); + } + desc->size /= desc->block_size; +} + +static void parse_range_param(struct chmem_desc *desc, char *start, char *end) +{ + if (desc->use_blocks) { + desc->start = strtou64_or_err(start, _("Failed to parse start")); + desc->end = strtou64_or_err(end, _("Failed to parse end")); + return; + } + if (strlen(start) < 2 || start[1] != 'x') + errx(EXIT_FAILURE, _("Invalid start address format: %s"), start); + if (strlen(end) < 2 || end[1] != 'x') + errx(EXIT_FAILURE, _("Invalid end address format: %s"), end); + desc->start = strtox64_or_err(start, _("Failed to parse start address")); + desc->end = strtox64_or_err(end, _("Failed to parse end address")); + if (desc->start % desc->block_size || (desc->end + 1) % desc->block_size) { + errx(EXIT_FAILURE, + _("Start address and (end address + 1) must be aligned to " + "memory block size (%s)"), + size_to_human_string(SIZE_SUFFIX_1LETTER, desc->block_size)); + } + desc->start /= desc->block_size; + desc->end /= desc->block_size; +} + +static void parse_parameter(struct chmem_desc *desc, char *param) +{ + char **split; + + split = strv_split(param, "-"); + if (strv_length(split) > 2) + errx(EXIT_FAILURE, _("Invalid parameter: %s"), param); + if (strv_length(split) == 1) + parse_single_param(desc, split[0]); + else + parse_range_param(desc, split[0], split[1]); + strv_free(split); + if (desc->start > desc->end) + errx(EXIT_FAILURE, _("Invalid range: %s"), param); +} + +static void __attribute__((__noreturn__)) chmem_usage(FILE *out) +{ + fputs(USAGE_HEADER, out); + fprintf(out, _(" %s [options] [SIZE|RANGE|BLOCKRANGE]\n"), program_invocation_short_name); + + fputs(USAGE_SEPARATOR, out); + fputs(_("Set a particular size or range of memory online or offline.\n"), out); + + fputs(USAGE_OPTIONS, out); + fputs(_(" -e, --enable enable memory\n"), out); + fputs(_(" -d, --disable disable memory\n"), out); + fputs(_(" -b, --blocks use memory blocks\n"), out); + fputs(_(" -v, --verbose verbose output\n"), out); + fputs(USAGE_SEPARATOR, out); + fputs(USAGE_HELP, out); + fputs(USAGE_VERSION, out); + + fprintf(out, USAGE_MAN_TAIL("chmem(8)")); + + exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS); +} + +int main(int argc, char **argv) +{ + struct chmem_desc _desc = { }, *desc = &_desc; + int cmd = CMD_NONE; + int c, rc; + + static const struct option longopts[] = { + {"block", no_argument, NULL, 'b'}, + {"disable", no_argument, NULL, 'd'}, + {"enable", no_argument, NULL, 'e'}, + {"help", no_argument, NULL, 'h'}, + {"verbose", no_argument, NULL, 'v'}, + {"version", no_argument, NULL, 'V'}, + {NULL, 0, NULL, 0} + }; + + static const ul_excl_t excl[] = { /* rows and cols in ASCII order */ + { 'd','e' }, + { 0 } + }; + int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT; + + setlocale(LC_ALL, ""); + bindtextdomain(PACKAGE, LOCALEDIR); + textdomain(PACKAGE); + atexit(close_stdout); + + read_info(desc); + + while ((c = getopt_long(argc, argv, "bdehvV", longopts, NULL)) != -1) { + + err_exclusive_options(c, longopts, excl, excl_st); + + switch (c) { + case 'd': + cmd = CMD_MEMORY_DISABLE; + break; + case 'e': + cmd = CMD_MEMORY_ENABLE; + break; + case 'b': + desc->use_blocks = 1; + break; + case 'h': + chmem_usage(stdout); + break; + case 'v': + desc->verbose = 1; + break; + case 'V': + printf(UTIL_LINUX_VERSION); + return EXIT_SUCCESS; + } + } + + if ((argc == 1) || (argc != optind + 1) || (cmd == CMD_NONE)) + chmem_usage(stderr); + + parse_parameter(desc, argv[optind]); + + if (desc->is_size) + rc = chmem_size(desc, cmd == CMD_MEMORY_ENABLE ? 1 : 0); + else + rc = chmem_range(desc, cmd == CMD_MEMORY_ENABLE ? 1 : 0); + + return rc == 0 ? EXIT_SUCCESS : + rc < 0 ? EXIT_FAILURE : CHMEM_EXIT_SOMEOK; +} |