2010-08-03 16:03:32 +00:00
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// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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/* Check brick
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* checks various semantic properties, uses watchdog to find lost callbacks.
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*/
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2012-01-30 11:54:56 +00:00
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/* FIXME: this code has been unused for a long time, it is unlikly
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* to work at all.
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*/
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/* FIXME: improve this a lot!
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* Check really _anything_ in the interface which _could_ go wrong,
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* even by the silliest type of accident!
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*/
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2010-08-03 16:03:32 +00:00
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//#define BRICK_DEBUGGING
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//#define MARS_DEBUGGING
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2012-01-30 11:54:56 +00:00
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//#define IO_DEBUGGING
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//#define STAT_DEBUGGING
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2010-08-03 16:03:32 +00:00
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/kthread.h>
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#include "mars.h"
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///////////////////////// own type definitions ////////////////////////
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#include "mars_check.h"
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///////////////////////// own helper functions ////////////////////////
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2010-08-20 10:58:24 +00:00
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#define CHECK_ERR(output,fmt,args...) \
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do { \
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struct check_input *input = (output)->brick->inputs[0]; \
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struct generic_output *other = (void*)input->connect; \
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if (other) { \
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MARS_ERR("instance %d/%s/%s: " fmt, \
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(output)->instance_nr, \
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other->type->type_name, \
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other->output_name, \
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##args); \
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} else { \
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MARS_ERR("instance %d: " fmt, \
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(output)->instance_nr, \
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##args); \
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} \
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} while (0)
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2012-01-30 11:54:56 +00:00
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static void check_endio(struct generic_callback *cb)
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2010-08-03 16:03:32 +00:00
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{
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2010-12-15 12:13:18 +00:00
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struct check_mref_aspect *mref_a;
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struct mref_object *mref;
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2010-08-10 17:39:30 +00:00
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struct check_output *output;
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struct check_input *input;
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2010-08-03 16:03:32 +00:00
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unsigned long flags;
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2010-08-10 17:39:30 +00:00
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mref_a = cb->cb_private;
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2010-08-23 05:06:06 +00:00
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CHECK_PTR(mref_a, fatal);
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_CHECK(&mref_a->cb == cb, fatal);
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2010-08-10 17:39:30 +00:00
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mref = mref_a->object;
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2010-08-23 05:06:06 +00:00
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CHECK_PTR(mref, fatal);
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2010-08-10 17:39:30 +00:00
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output = mref_a->output;
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2010-08-23 05:06:06 +00:00
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CHECK_PTR(output, fatal);
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2010-08-10 17:39:30 +00:00
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input = output->brick->inputs[0];
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2010-08-23 05:06:06 +00:00
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CHECK_PTR(input, fatal);
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2010-08-05 08:36:36 +00:00
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2010-08-09 16:57:56 +00:00
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if (atomic_dec_and_test(&mref_a->callback_count)) {
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atomic_set(&mref_a->callback_count, 1);
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2010-08-20 10:58:24 +00:00
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CHECK_ERR(output, "too many callbacks on %p\n", mref);
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2010-08-05 08:36:36 +00:00
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}
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2010-08-08 09:03:42 +00:00
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#ifdef CHECK_LOCK
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traced_lock(&output->check_lock, flags);
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2010-08-05 15:54:48 +00:00
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if (list_empty(&mref_a->mref_head)) {
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2010-08-20 10:58:24 +00:00
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CHECK_ERR(output, "list entry missing on %p\n", mref);
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2010-08-03 16:03:32 +00:00
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}
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2010-08-05 15:54:48 +00:00
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list_del_init(&mref_a->mref_head);
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2010-08-05 08:36:36 +00:00
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2010-08-07 07:59:34 +00:00
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traced_unlock(&output->check_lock, flags);
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2010-08-09 16:57:56 +00:00
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#else
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(void)flags;
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2010-08-08 09:03:42 +00:00
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#endif
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2010-08-03 16:03:32 +00:00
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2010-08-05 15:54:48 +00:00
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mref_a->last_jiffies = jiffies;
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2010-08-08 14:02:54 +00:00
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2012-01-30 11:54:56 +00:00
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NEXT_CHECKED_CALLBACK(cb, fatal);
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2010-08-10 17:39:30 +00:00
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return;
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fatal:
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msleep(60000);
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return;
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2010-08-03 16:03:32 +00:00
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}
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2010-08-09 16:57:56 +00:00
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#ifdef CHECK_LOCK
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2010-08-04 17:32:04 +00:00
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static void dump_mem(void *data, int len)
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{
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int i;
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char *tmp;
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2011-08-25 10:16:32 +00:00
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char *buf = brick_string_alloc(0);
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2011-03-01 18:00:14 +00:00
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if (!buf)
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return;
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2010-08-04 17:32:04 +00:00
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for (i = 0, tmp = buf; i < len; i++) {
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unsigned char byte = ((unsigned char*)data)[i];
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if (!(i % 8)) {
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if (tmp != buf) {
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2012-02-02 10:16:06 +00:00
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say(-1, "%4d: %s\n", i, buf);
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2010-08-04 17:32:04 +00:00
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}
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tmp = buf;
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}
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2011-07-20 13:11:44 +00:00
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tmp += snprintf(tmp, 1024 - i * 3, " %02x", byte);
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2010-08-04 17:32:04 +00:00
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}
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if (tmp != buf) {
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2012-02-02 10:16:06 +00:00
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say(-1, "%4d: %s\n", i, buf);
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2010-08-04 17:32:04 +00:00
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}
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2011-08-12 11:09:48 +00:00
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brick_string_free(buf);
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2010-08-04 17:32:04 +00:00
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}
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2010-08-03 16:03:32 +00:00
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static int check_watchdog(void *data)
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{
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struct check_output *output = data;
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MARS_INF("watchdog has started.\n");
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while (!kthread_should_stop()) {
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struct list_head *h;
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unsigned long flags;
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unsigned long now;
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2011-10-20 09:06:17 +00:00
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msleep(5000);
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2010-08-03 16:03:32 +00:00
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2010-08-07 07:59:34 +00:00
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traced_lock(&output->check_lock, flags);
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2010-08-03 16:03:32 +00:00
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now = jiffies;
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2010-08-05 15:54:48 +00:00
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for (h = output->mref_anchor.next; h != &output->mref_anchor; h = h->next) {
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2010-08-07 07:59:34 +00:00
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static int limit = 1;
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const int timeout = 30;
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2010-12-15 12:13:18 +00:00
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struct check_mref_aspect *mref_a;
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struct mref_object *mref;
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2010-08-03 16:03:32 +00:00
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unsigned long elapsed;
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2010-12-15 12:13:18 +00:00
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mref_a = container_of(h, struct check_mref_aspect, mref_head);
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2010-08-05 15:54:48 +00:00
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mref = mref_a->object;
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elapsed = now - mref_a->last_jiffies;
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2010-08-07 07:59:34 +00:00
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if (elapsed > timeout * HZ && limit-- > 0) {
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2010-08-04 17:32:04 +00:00
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struct generic_object_layout *object_layout;
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2010-08-05 15:54:48 +00:00
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mref_a->last_jiffies = now + 600 * HZ;
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2010-08-20 10:58:24 +00:00
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MARS_INF("================================\n");
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CHECK_ERR(output, "mref %p callback is missing for more than %d seconds.\n", mref, timeout);
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2010-08-05 15:54:48 +00:00
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object_layout = (void*)mref->object_layout;
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2012-01-30 11:54:56 +00:00
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dump_mem(mref, object_layout->size_hint);
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2010-08-20 10:58:24 +00:00
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MARS_INF("================================\n");
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2010-08-03 16:03:32 +00:00
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}
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}
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2010-08-08 09:03:42 +00:00
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2010-08-07 07:59:34 +00:00
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traced_unlock(&output->check_lock, flags);
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2010-08-03 16:03:32 +00:00
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}
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return 0;
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}
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2010-08-09 16:57:56 +00:00
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#endif
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2010-08-03 16:03:32 +00:00
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////////////////// own brick / input / output operations //////////////////
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static int check_get_info(struct check_output *output, struct mars_info *info)
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{
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struct check_input *input = output->brick->inputs[0];
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return GENERIC_INPUT_CALL(input, mars_get_info, info);
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}
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2010-12-15 12:13:18 +00:00
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static int check_ref_get(struct check_output *output, struct mref_object *mref)
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2010-08-03 16:03:32 +00:00
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{
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struct check_input *input = output->brick->inputs[0];
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2010-12-15 12:13:18 +00:00
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return GENERIC_INPUT_CALL(input, mref_get, mref);
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2010-08-03 16:03:32 +00:00
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}
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2010-12-15 12:13:18 +00:00
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static void check_ref_put(struct check_output *output, struct mref_object *mref)
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2010-08-03 16:03:32 +00:00
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{
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struct check_input *input = output->brick->inputs[0];
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2010-12-15 12:13:18 +00:00
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GENERIC_INPUT_CALL(input, mref_put, mref);
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2010-08-03 16:03:32 +00:00
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}
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2010-12-15 12:13:18 +00:00
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static void check_ref_io(struct check_output *output, struct mref_object *mref)
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2010-08-03 16:03:32 +00:00
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{
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struct check_input *input = output->brick->inputs[0];
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2011-10-03 17:31:02 +00:00
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struct check_mref_aspect *mref_a = check_mref_get_aspect(output->brick, mref);
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2010-08-03 16:03:32 +00:00
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unsigned long flags;
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2010-08-05 08:36:36 +00:00
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2010-08-23 05:06:06 +00:00
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CHECK_PTR(mref_a, fatal);
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2010-08-05 08:36:36 +00:00
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2010-08-09 16:57:56 +00:00
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if (atomic_dec_and_test(&mref_a->call_count)) {
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atomic_set(&mref_a->call_count, 1);
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2010-08-20 10:58:24 +00:00
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CHECK_ERR(output, "multiple parallel calls on %p\n", mref);
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2010-08-05 08:36:36 +00:00
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}
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2010-08-09 16:57:56 +00:00
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atomic_set(&mref_a->callback_count, 2);
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2010-08-08 09:03:42 +00:00
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#ifdef CHECK_LOCK
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traced_lock(&output->check_lock, flags);
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2010-08-10 17:39:30 +00:00
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2010-08-05 15:54:48 +00:00
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if (!list_empty(&mref_a->mref_head)) {
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2010-08-20 10:58:24 +00:00
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CHECK_ERR(output, "list head not empty on %p\n", mref);
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2010-08-10 17:39:30 +00:00
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list_del(&mref_a->mref_head);
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2010-08-03 16:03:32 +00:00
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}
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2010-08-05 15:54:48 +00:00
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list_add_tail(&mref_a->mref_head, &output->mref_anchor);
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2010-08-10 17:39:30 +00:00
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2010-08-08 09:03:42 +00:00
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traced_unlock(&output->check_lock, flags);
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2010-08-09 16:57:56 +00:00
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#else
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(void)flags;
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2010-08-08 09:03:42 +00:00
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#endif
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2012-01-30 11:54:56 +00:00
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mref_a->last_jiffies = jiffies;
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2010-08-10 17:39:30 +00:00
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if (!mref_a->installed) {
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mref_a->installed = true;
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mref_a->output = output;
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2012-01-30 11:54:56 +00:00
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INSERT_CALLBACK(mref, &mref_a->cb, check_endio, mref_a);
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2010-08-03 16:03:32 +00:00
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}
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2010-08-05 08:36:36 +00:00
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2010-12-15 12:13:18 +00:00
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GENERIC_INPUT_CALL(input, mref_io, mref);
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2010-08-09 16:57:56 +00:00
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atomic_inc(&mref_a->call_count);
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2010-08-23 05:06:06 +00:00
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fatal: ;
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2010-08-03 16:03:32 +00:00
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}
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//////////////// object / aspect constructors / destructors ///////////////
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2011-10-03 17:31:02 +00:00
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static int check_mref_aspect_init_fn(struct generic_aspect *_ini)
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2010-08-03 16:03:32 +00:00
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{
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2010-12-15 12:13:18 +00:00
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struct check_mref_aspect *ini = (void*)_ini;
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2010-08-08 09:03:42 +00:00
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#ifdef CHECK_LOCK
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2010-08-05 15:54:48 +00:00
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INIT_LIST_HEAD(&ini->mref_head);
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2010-08-08 09:03:42 +00:00
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#endif
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ini->last_jiffies = jiffies;
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2010-08-09 16:57:56 +00:00
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atomic_set(&ini->call_count, 2);
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atomic_set(&ini->callback_count, 1);
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2010-08-10 17:39:30 +00:00
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ini->installed = false;
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2010-08-03 16:03:32 +00:00
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return 0;
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}
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2011-10-03 17:31:02 +00:00
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static void check_mref_aspect_exit_fn(struct generic_aspect *_ini)
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2010-08-08 09:03:42 +00:00
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{
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2010-12-15 12:13:18 +00:00
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struct check_mref_aspect *ini = (void*)_ini;
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2010-08-08 09:03:42 +00:00
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(void)ini;
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#ifdef CHECK_LOCK
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2010-08-20 10:58:24 +00:00
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if (!list_empty(&ini->mref_head)) {
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struct check_output *output = ini->output;
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if (output) {
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CHECK_ERR(output, "list head not empty on %p\n", ini->object);
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INIT_LIST_HEAD(&ini->mref_head);
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} else {
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CHECK_HEAD_EMPTY(&ini->mref_head);
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}
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}
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2010-08-08 09:03:42 +00:00
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#endif
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}
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2010-08-03 16:03:32 +00:00
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MARS_MAKE_STATICS(check);
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////////////////////// brick constructors / destructors ////////////////////
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static int check_brick_construct(struct check_brick *brick)
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{
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return 0;
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}
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static int check_output_construct(struct check_output *output)
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{
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static int count = 0;
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2010-08-09 16:57:56 +00:00
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#ifdef CHECK_LOCK
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2010-08-03 16:03:32 +00:00
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struct task_struct *watchdog;
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2010-08-05 08:36:36 +00:00
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2010-08-08 09:03:42 +00:00
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spin_lock_init(&output->check_lock);
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2010-08-05 15:54:48 +00:00
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INIT_LIST_HEAD(&output->mref_anchor);
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2010-08-03 16:03:32 +00:00
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watchdog = kthread_create(check_watchdog, output, "check_watchdog%d", output->instance_nr);
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if (!IS_ERR(watchdog)) {
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output->watchdog = watchdog;
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wake_up_process(watchdog);
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}
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2010-08-09 16:57:56 +00:00
|
|
|
#endif
|
|
|
|
output->instance_nr = ++count;
|
2010-08-03 16:03:32 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
///////////////////////// static structs ////////////////////////
|
|
|
|
|
|
|
|
static struct check_brick_ops check_brick_ops = {
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct check_output_ops check_output_ops = {
|
|
|
|
.mars_get_info = check_get_info,
|
2010-12-15 12:13:18 +00:00
|
|
|
.mref_get = check_ref_get,
|
|
|
|
.mref_put = check_ref_put,
|
|
|
|
.mref_io = check_ref_io,
|
2010-08-03 16:03:32 +00:00
|
|
|
};
|
|
|
|
|
2010-08-10 17:39:30 +00:00
|
|
|
const struct check_input_type check_input_type = {
|
2010-08-03 16:03:32 +00:00
|
|
|
.type_name = "check_input",
|
|
|
|
.input_size = sizeof(struct check_input),
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct check_input_type *check_input_types[] = {
|
|
|
|
&check_input_type,
|
|
|
|
};
|
|
|
|
|
2010-08-10 17:39:30 +00:00
|
|
|
const struct check_output_type check_output_type = {
|
2010-08-03 16:03:32 +00:00
|
|
|
.type_name = "check_output",
|
|
|
|
.output_size = sizeof(struct check_output),
|
|
|
|
.master_ops = &check_output_ops,
|
|
|
|
.output_construct = &check_output_construct,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const struct check_output_type *check_output_types[] = {
|
|
|
|
&check_output_type,
|
|
|
|
};
|
|
|
|
|
|
|
|
const struct check_brick_type check_brick_type = {
|
|
|
|
.type_name = "check_brick",
|
|
|
|
.brick_size = sizeof(struct check_brick),
|
|
|
|
.max_inputs = 1,
|
|
|
|
.max_outputs = 1,
|
|
|
|
.master_ops = &check_brick_ops,
|
2011-10-03 17:31:02 +00:00
|
|
|
.aspect_types = check_aspect_types,
|
2010-08-03 16:03:32 +00:00
|
|
|
.default_input_types = check_input_types,
|
|
|
|
.default_output_types = check_output_types,
|
|
|
|
.brick_construct = &check_brick_construct,
|
|
|
|
};
|
|
|
|
EXPORT_SYMBOL_GPL(check_brick_type);
|
|
|
|
|
|
|
|
////////////////// module init stuff /////////////////////////
|
|
|
|
|
2012-01-30 11:54:56 +00:00
|
|
|
int __init init_mars_check(void)
|
2010-08-03 16:03:32 +00:00
|
|
|
{
|
2012-01-30 11:54:56 +00:00
|
|
|
MARS_INF("init_check()\n");
|
2010-08-03 16:03:32 +00:00
|
|
|
return check_register_brick_type();
|
|
|
|
}
|
|
|
|
|
2012-01-30 11:54:56 +00:00
|
|
|
void __exit exit_mars_check(void)
|
2010-08-03 16:03:32 +00:00
|
|
|
{
|
2012-01-30 11:54:56 +00:00
|
|
|
MARS_INF("exit_check()\n");
|
2010-08-03 16:03:32 +00:00
|
|
|
check_unregister_brick_type();
|
|
|
|
}
|
|
|
|
|
2012-01-30 11:54:56 +00:00
|
|
|
#ifndef CONFIG_MARS_HAVE_BIGMODULE
|
2010-08-03 16:03:32 +00:00
|
|
|
MODULE_DESCRIPTION("MARS check brick");
|
|
|
|
MODULE_AUTHOR("Thomas Schoebel-Theuer <tst@1und1.de>");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
2012-01-30 11:54:56 +00:00
|
|
|
module_init(init_mars_check);
|
|
|
|
module_exit(exit_mars_check);
|
|
|
|
#endif
|