/*
* page-types: Tool for querying page flags
*
+ * 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; version 2.
+ *
+ * This program 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 General Public License for
+ * more details.
+ *
+ * You should find a copy of v2 of the GNU General Public License somewhere on
+ * your Linux system; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ *
* Copyright (C) 2009 Intel corporation
*
* Authors: Wu Fengguang <fengguang.wu@intel.com>
- *
- * Released under the General Public License (GPL).
*/
#define _LARGEFILE64_SOURCE
#define BIT(name) (1ULL << KPF_##name)
#define BITS_COMPOUND (BIT(COMPOUND_HEAD) | BIT(COMPOUND_TAIL))
-static char *page_flag_names[] = {
+static const char *page_flag_names[] = {
[KPF_LOCKED] = "L:locked",
[KPF_ERROR] = "E:error",
[KPF_REFERENCED] = "R:referenced",
static int pagemap_fd;
static int kpageflags_fd;
+static int opt_hwpoison;
+static int opt_unpoison;
+
+static const char hwpoison_debug_fs[] = "/debug/hwpoison";
+static int hwpoison_inject_fd;
+static int hwpoison_forget_fd;
+
#define HASH_SHIFT 13
#define HASH_SIZE (1 << HASH_SHIFT)
#define HASH_MASK (HASH_SIZE - 1)
exit(EXIT_FAILURE);
}
-int checked_open(const char *pathname, int flags)
+static int checked_open(const char *pathname, int flags)
{
int fd = open(pathname, flags);
present = (flags >> i) & 1;
if (!page_flag_names[i]) {
if (present)
- fatal("unkown flag bit %d\n", i);
+ fatal("unknown flag bit %d\n", i);
continue;
}
buf[j++] = present ? page_flag_names[i][0] : '_';
}
/*
+ * page actions
+ */
+
+static void prepare_hwpoison_fd(void)
+{
+ char buf[100];
+
+ if (opt_hwpoison && !hwpoison_inject_fd) {
+ sprintf(buf, "%s/corrupt-pfn", hwpoison_debug_fs);
+ hwpoison_inject_fd = checked_open(buf, O_WRONLY);
+ }
+
+ if (opt_unpoison && !hwpoison_forget_fd) {
+ sprintf(buf, "%s/renew-pfn", hwpoison_debug_fs);
+ hwpoison_forget_fd = checked_open(buf, O_WRONLY);
+ }
+}
+
+static int hwpoison_page(unsigned long offset)
+{
+ char buf[100];
+ int len;
+
+ len = sprintf(buf, "0x%lx\n", offset);
+ len = write(hwpoison_inject_fd, buf, len);
+ if (len < 0) {
+ perror("hwpoison inject");
+ return len;
+ }
+ return 0;
+}
+
+static int unpoison_page(unsigned long offset)
+{
+ char buf[100];
+ int len;
+
+ len = sprintf(buf, "0x%lx\n", offset);
+ len = write(hwpoison_forget_fd, buf, len);
+ if (len < 0) {
+ perror("hwpoison forget");
+ return len;
+ }
+ return 0;
+}
+
+/*
* page frame walker
*/
if (!bit_mask_ok(flags))
return;
+ if (opt_hwpoison)
+ hwpoison_page(offset);
+ if (opt_unpoison)
+ unpoison_page(offset);
+
if (opt_list == 1)
show_page_range(voffset, offset, flags);
else if (opt_list == 2)
{
uint64_t buf[KPAGEFLAGS_BATCH];
unsigned long batch;
- unsigned long pages;
+ long pages;
unsigned long i;
while (count) {
printf(
"page-types [options]\n"
-" -r|--raw Raw mode, for kernel developers\n"
-" -a|--addr addr-spec Walk a range of pages\n"
-" -b|--bits bits-spec Walk pages with specified bits\n"
-" -p|--pid pid Walk process address space\n"
+" -r|--raw Raw mode, for kernel developers\n"
+" -d|--describe flags Describe flags\n"
+" -a|--addr addr-spec Walk a range of pages\n"
+" -b|--bits bits-spec Walk pages with specified bits\n"
+" -p|--pid pid Walk process address space\n"
#if 0 /* planned features */
-" -f|--file filename Walk file address space\n"
+" -f|--file filename Walk file address space\n"
#endif
-" -l|--list Show page details in ranges\n"
-" -L|--list-each Show page details one by one\n"
-" -N|--no-summary Don't show summay info\n"
-" -h|--help Show this usage message\n"
+" -l|--list Show page details in ranges\n"
+" -L|--list-each Show page details one by one\n"
+" -N|--no-summary Don't show summay info\n"
+" -X|--hwpoison hwpoison pages\n"
+" -x|--unpoison unpoison pages\n"
+" -h|--help Show this usage message\n"
+"flags:\n"
+" 0x10 bitfield format, e.g.\n"
+" anon bit-name, e.g.\n"
+" 0x10,anon comma-separated list, e.g.\n"
"addr-spec:\n"
-" N one page at offset N (unit: pages)\n"
-" N+M pages range from N to N+M-1\n"
-" N,M pages range from N to M-1\n"
-" N, pages range from N to end\n"
-" ,M pages range from 0 to M-1\n"
+" N one page at offset N (unit: pages)\n"
+" N+M pages range from N to N+M-1\n"
+" N,M pages range from N to M-1\n"
+" N, pages range from N to end\n"
+" ,M pages range from 0 to M-1\n"
"bits-spec:\n"
-" bit1,bit2 (flags & (bit1|bit2)) != 0\n"
-" bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
-" bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
-" =bit1,bit2 flags == (bit1|bit2)\n"
+" bit1,bit2 (flags & (bit1|bit2)) != 0\n"
+" bit1,bit2=bit1 (flags & (bit1|bit2)) == bit1\n"
+" bit1,~bit2 (flags & (bit1|bit2)) == bit1\n"
+" =bit1,bit2 flags == (bit1|bit2)\n"
"bit-names:\n"
);
add_bits_filter(mask, bits);
}
+static void describe_flags(const char *optarg)
+{
+ uint64_t flags = parse_flag_names(optarg, 0);
-static struct option opts[] = {
+ printf("0x%016llx\t%s\t%s\n",
+ (unsigned long long)flags,
+ page_flag_name(flags),
+ page_flag_longname(flags));
+}
+
+static const struct option opts[] = {
{ "raw" , 0, NULL, 'r' },
{ "pid" , 1, NULL, 'p' },
{ "file" , 1, NULL, 'f' },
{ "addr" , 1, NULL, 'a' },
{ "bits" , 1, NULL, 'b' },
+ { "describe" , 1, NULL, 'd' },
{ "list" , 0, NULL, 'l' },
{ "list-each" , 0, NULL, 'L' },
{ "no-summary", 0, NULL, 'N' },
+ { "hwpoison" , 0, NULL, 'X' },
+ { "unpoison" , 0, NULL, 'x' },
{ "help" , 0, NULL, 'h' },
{ NULL , 0, NULL, 0 }
};
page_size = getpagesize();
while ((c = getopt_long(argc, argv,
- "rp:f:a:b:lLNh", opts, NULL)) != -1) {
+ "rp:f:a:b:d:lLNXxh", opts, NULL)) != -1) {
switch (c) {
case 'r':
opt_raw = 1;
case 'b':
parse_bits_mask(optarg);
break;
+ case 'd':
+ describe_flags(optarg);
+ exit(0);
case 'l':
opt_list = 1;
break;
case 'N':
opt_no_summary = 1;
break;
+ case 'X':
+ opt_hwpoison = 1;
+ prepare_hwpoison_fd();
+ break;
+ case 'x':
+ opt_unpoison = 1;
+ prepare_hwpoison_fd();
+ break;
case 'h':
usage();
exit(0);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff