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Commit a54fed9f authored by Wu Fengguang's avatar Wu Fengguang Committed by Linus Torvalds
Browse files

page-types: add hwpoison/unpoison feature 



For hwpoison stress testing.  The debugfs mount point is assumed to be
/debug/.

Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 48640d69

Documentation/vm/page-types.c

+72 −1
Original line number Diff line number Diff line
@@ -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)
@@ -446,6 +453,53 @@ static uint64_t kpageflags_flags(uint64_t flags) 
	return 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);