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authorWu Fengguang <fengguang.wu@intel.com>2009-10-07 16:32:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-10-08 07:36:39 -0700
commita54fed9f70a2765f4476e1ce3d691a2f31df258f (patch)
tree407b053daa58bc6f6c855cacf5133005c005dcd3 /Documentation
parent48640d69f5f06fe951a4de065a7f374cb9ee6040 (diff)
downloadlwn-a54fed9f70a2765f4476e1ce3d691a2f31df258f.tar.gz
lwn-a54fed9f70a2765f4476e1ce3d691a2f31df258f.zip
page-types: add hwpoison/unpoison feature
For hwpoison stress testing. The debugfs mount point is assumed to be /debug/. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Cc: Andi Kleen <andi@firstfloor.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/vm/page-types.c73
1 files changed, 72 insertions, 1 deletions
diff --git a/Documentation/vm/page-types.c b/Documentation/vm/page-types.c
index 11b9a03f7b10..3ec4f2a22585 100644
--- a/Documentation/vm/page-types.c
+++ b/Documentation/vm/page-types.c
@@ -170,6 +170,13 @@ static int page_size;
static int pagemap_fd;
static int kpageflags_fd;
+static int opt_hwpoison;
+static int opt_unpoison;
+
+static 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)
@@ -447,6 +454,53 @@ static uint64_t kpageflags_flags(uint64_t flags)
}
/*
+ * 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
*/
@@ -485,6 +539,11 @@ static void add_page(unsigned long voffset,
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)
@@ -624,6 +683,8 @@ static void usage(void)
" -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"
"addr-spec:\n"
" N one page at offset N (unit: pages)\n"
@@ -833,6 +894,8 @@ static struct option opts[] = {
{ "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 }
};
@@ -844,7 +907,7 @@ int main(int argc, char *argv[])
page_size = getpagesize();
while ((c = getopt_long(argc, argv,
- "rp:f:a:b:lLNh", opts, NULL)) != -1) {
+ "rp:f:a:b:lLNXxh", opts, NULL)) != -1) {
switch (c) {
case 'r':
opt_raw = 1;
@@ -870,6 +933,14 @@ int main(int argc, char *argv[])
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);