mars/mars_check.c

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// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
/* Check brick
* checks various semantic properties, uses watchdog to find lost callbacks.
*/
//#define BRICK_DEBUGGING
//#define MARS_DEBUGGING
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/kthread.h>
#include "mars.h"
///////////////////////// own type definitions ////////////////////////
#include "mars_check.h"
///////////////////////// own helper functions ////////////////////////
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#define CHECK_ERR(output,fmt,args...) \
do { \
struct check_input *input = (output)->brick->inputs[0]; \
struct generic_output *other = (void*)input->connect; \
if (other) { \
MARS_ERR("instance %d/%s/%s: " fmt, \
(output)->instance_nr, \
other->type->type_name, \
other->output_name, \
##args); \
} else { \
MARS_ERR("instance %d: " fmt, \
(output)->instance_nr, \
##args); \
} \
} while (0)
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static void check_buf_endio(struct generic_callback *cb)
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{
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struct check_mref_aspect *mref_a;
struct mref_object *mref;
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struct check_output *output;
struct check_input *input;
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struct generic_callback *prev_cb;
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unsigned long flags;
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mref_a = cb->cb_private;
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CHECK_PTR(mref_a, fatal);
_CHECK(&mref_a->cb == cb, fatal);
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mref = mref_a->object;
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CHECK_PTR(mref, fatal);
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output = mref_a->output;
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CHECK_PTR(output, fatal);
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input = output->brick->inputs[0];
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CHECK_PTR(input, fatal);
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if (atomic_dec_and_test(&mref_a->callback_count)) {
atomic_set(&mref_a->callback_count, 1);
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CHECK_ERR(output, "too many callbacks on %p\n", mref);
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}
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#ifdef CHECK_LOCK
traced_lock(&output->check_lock, flags);
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if (list_empty(&mref_a->mref_head)) {
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CHECK_ERR(output, "list entry missing on %p\n", mref);
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}
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list_del_init(&mref_a->mref_head);
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traced_unlock(&output->check_lock, flags);
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#else
(void)flags;
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#endif
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mref_a->last_jiffies = jiffies;
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prev_cb = cb->cb_prev;
if (!prev_cb) {
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MARS_FAT("cannot get chain callback\n");
return;
}
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#if 1
mref->ref_cb = prev_cb;
mref_a->installed = false;
#endif
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prev_cb->cb_fn(prev_cb);
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return;
fatal:
msleep(60000);
return;
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}
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#ifdef CHECK_LOCK
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static void dump_mem(void *data, int len)
{
int i;
char *tmp;
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char *buf = brick_string_alloc(0);
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if (!buf)
return;
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for (i = 0, tmp = buf; i < len; i++) {
unsigned char byte = ((unsigned char*)data)[i];
if (!(i % 8)) {
if (tmp != buf) {
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printk("%4d: %s\n", i, buf);
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}
tmp = buf;
}
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tmp += snprintf(tmp, 1024 - i * 3, " %02x", byte);
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}
if (tmp != buf) {
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printk("%4d: %s\n", i, buf);
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}
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brick_string_free(buf);
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}
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static int check_watchdog(void *data)
{
struct check_output *output = data;
MARS_INF("watchdog has started.\n");
while (!kthread_should_stop()) {
struct list_head *h;
unsigned long flags;
unsigned long now;
msleep(5000);
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traced_lock(&output->check_lock, flags);
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now = jiffies;
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for (h = output->mref_anchor.next; h != &output->mref_anchor; h = h->next) {
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static int limit = 1;
const int timeout = 30;
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struct check_mref_aspect *mref_a;
struct mref_object *mref;
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unsigned long elapsed;
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mref_a = container_of(h, struct check_mref_aspect, mref_head);
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mref = mref_a->object;
elapsed = now - mref_a->last_jiffies;
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if (elapsed > timeout * HZ && limit-- > 0) {
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struct generic_object_layout *object_layout;
int i;
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mref_a->last_jiffies = now + 600 * HZ;
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MARS_INF("================================\n");
CHECK_ERR(output, "mref %p callback is missing for more than %d seconds.\n", mref, timeout);
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object_layout = (void*)mref->object_layout;
//dump_mem(mref, object_layout->object_size);
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for (i = 0; i < object_layout->aspect_count; i++) {
struct generic_aspect_layout *aspect_layout;
int pos;
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aspect_layout = object_layout->aspect_layouts_table[i];
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pos = aspect_layout->aspect_offset;
if (i == 0) {
MARS_INF("object %s:\n", object_layout->object_type->object_type_name);
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dump_mem(mref, pos);
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}
MARS_INF("--- aspect %s ---:\n", aspect_layout->aspect_type->aspect_type_name);
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dump_mem(((void*)mref + pos), aspect_layout->aspect_type->aspect_size);
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}
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MARS_INF("================================\n");
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}
}
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traced_unlock(&output->check_lock, flags);
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}
return 0;
}
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#endif
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////////////////// own brick / input / output operations //////////////////
static int check_get_info(struct check_output *output, struct mars_info *info)
{
struct check_input *input = output->brick->inputs[0];
return GENERIC_INPUT_CALL(input, mars_get_info, info);
}
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static int check_ref_get(struct check_output *output, struct mref_object *mref)
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{
struct check_input *input = output->brick->inputs[0];
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return GENERIC_INPUT_CALL(input, mref_get, mref);
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}
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static void check_ref_put(struct check_output *output, struct mref_object *mref)
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{
struct check_input *input = output->brick->inputs[0];
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GENERIC_INPUT_CALL(input, mref_put, mref);
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}
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static void check_ref_io(struct check_output *output, struct mref_object *mref)
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{
struct check_input *input = output->brick->inputs[0];
struct check_mref_aspect *mref_a = check_mref_get_aspect(output->brick, mref);
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unsigned long flags;
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CHECK_PTR(mref_a, fatal);
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if (atomic_dec_and_test(&mref_a->call_count)) {
atomic_set(&mref_a->call_count, 1);
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CHECK_ERR(output, "multiple parallel calls on %p\n", mref);
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}
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atomic_set(&mref_a->callback_count, 2);
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#ifdef CHECK_LOCK
traced_lock(&output->check_lock, flags);
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if (!list_empty(&mref_a->mref_head)) {
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CHECK_ERR(output, "list head not empty on %p\n", mref);
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list_del(&mref_a->mref_head);
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}
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list_add_tail(&mref_a->mref_head, &output->mref_anchor);
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traced_unlock(&output->check_lock, flags);
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#else
(void)flags;
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#endif
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if (!mref_a->installed) {
struct generic_callback *cb = &mref_a->cb;
mref_a->installed = true;
mref_a->output = output;
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cb->cb_fn = check_buf_endio;
cb->cb_private = mref_a;
cb->cb_error = 0;
cb->cb_prev = mref->ref_cb;
mref->ref_cb = cb;
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}
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mref_a->last_jiffies = jiffies;
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GENERIC_INPUT_CALL(input, mref_io, mref);
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atomic_inc(&mref_a->call_count);
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fatal: ;
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}
//////////////// object / aspect constructors / destructors ///////////////
static int check_mref_aspect_init_fn(struct generic_aspect *_ini)
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{
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struct check_mref_aspect *ini = (void*)_ini;
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#ifdef CHECK_LOCK
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INIT_LIST_HEAD(&ini->mref_head);
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#endif
ini->last_jiffies = jiffies;
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atomic_set(&ini->call_count, 2);
atomic_set(&ini->callback_count, 1);
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ini->installed = false;
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return 0;
}
static void check_mref_aspect_exit_fn(struct generic_aspect *_ini)
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{
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struct check_mref_aspect *ini = (void*)_ini;
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(void)ini;
#ifdef CHECK_LOCK
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if (!list_empty(&ini->mref_head)) {
struct check_output *output = ini->output;
if (output) {
CHECK_ERR(output, "list head not empty on %p\n", ini->object);
INIT_LIST_HEAD(&ini->mref_head);
} else {
CHECK_HEAD_EMPTY(&ini->mref_head);
}
}
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#endif
}
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MARS_MAKE_STATICS(check);
////////////////////// brick constructors / destructors ////////////////////
static int check_brick_construct(struct check_brick *brick)
{
return 0;
}
static int check_output_construct(struct check_output *output)
{
static int count = 0;
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#ifdef CHECK_LOCK
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struct task_struct *watchdog;
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spin_lock_init(&output->check_lock);
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INIT_LIST_HEAD(&output->mref_anchor);
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watchdog = kthread_create(check_watchdog, output, "check_watchdog%d", output->instance_nr);
if (!IS_ERR(watchdog)) {
output->watchdog = watchdog;
wake_up_process(watchdog);
}
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#endif
output->instance_nr = ++count;
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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,
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.mref_get = check_ref_get,
.mref_put = check_ref_put,
.mref_io = check_ref_io,
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};
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const struct check_input_type check_input_type = {
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.type_name = "check_input",
.input_size = sizeof(struct check_input),
};
static const struct check_input_type *check_input_types[] = {
&check_input_type,
};
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const struct check_output_type check_output_type = {
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.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,
.aspect_types = check_aspect_types,
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.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 /////////////////////////
static int __init init_check(void)
{
printk(MARS_INFO "init_check()\n");
return check_register_brick_type();
}
static void __exit exit_check(void)
{
printk(MARS_INFO "exit_check()\n");
check_unregister_brick_type();
}
MODULE_DESCRIPTION("MARS check brick");
MODULE_AUTHOR("Thomas Schoebel-Theuer <tst@1und1.de>");
MODULE_LICENSE("GPL");
module_init(init_check);
module_exit(exit_check);