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    Subject[PATCH 8/8] page-types: add hwpoison/unpoison feature
    For hwpoison stress testing.
    The debugfs mount point is assumed to be /debug/.

    CC: Andi Kleen <andi@firstfloor.org>
    Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
    ---
    Documentation/vm/page-types.c | 73 +++++++++++++++++++++++++++++++-
    1 file changed, 72 insertions(+), 1 deletion(-)

    --- linux-mm.orig/Documentation/vm/page-types.c 2009-09-16 17:54:35.000000000 +0800
    +++ linux-mm/Documentation/vm/page-types.c 2009-09-16 17:54:59.000000000 +0800
    @@ -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_
    }

    /*
    + * 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 voffs
    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);
    --



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