mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 05:56:39 +07:00
ba58d1020a
Power management suspend/resume tracing (ab)uses the RTC to store
suspend/resume information persistently. As a consequence the RTC value is
clobbered when timekeeping is resumed and tries to inject the sleep time.
Commit a4f8f6667f
("timekeeping: Cap array access in timekeeping_debug")
plugged a out of bounds array access in the timekeeping debug code which
was caused by the clobbered RTC value, but we still use the clobbered RTC
value for sleep time injection into kernel timekeeping, which will result
in random adjustments depending on the stored "hash" value.
To prevent this keep track of the RTC clobbering and ignore the invalid RTC
timestamp at resume. If the system resumed successfully clear the flag,
which marks the RTC as unusable, warn the user about the RTC clobber and
recommend to adjust the RTC with 'ntpdate' or 'rdate'.
[jstultz: Fixed up pr_warn formating, and implemented suggestions from Ingo]
[ tglx: Rewrote changelog ]
Originally-from: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Prarit Bhargava <prarit@redhat.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Richard Cochran <richardcochran@gmail.com>
Cc: Xunlei Pang <xlpang@redhat.com>
Cc: Len Brown <lenb@kernel.org>
Link: http://lkml.kernel.org/r/1480372524-15181-3-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
294 lines
7.6 KiB
C
294 lines
7.6 KiB
C
/*
|
|
* drivers/base/power/trace.c
|
|
*
|
|
* Copyright (C) 2006 Linus Torvalds
|
|
*
|
|
* Trace facility for suspend/resume problems, when none of the
|
|
* devices may be working.
|
|
*/
|
|
|
|
#include <linux/pm-trace.h>
|
|
#include <linux/export.h>
|
|
#include <linux/rtc.h>
|
|
#include <linux/suspend.h>
|
|
|
|
#include <linux/mc146818rtc.h>
|
|
|
|
#include "power.h"
|
|
|
|
/*
|
|
* Horrid, horrid, horrid.
|
|
*
|
|
* It turns out that the _only_ piece of hardware that actually
|
|
* keeps its value across a hard boot (and, more importantly, the
|
|
* POST init sequence) is literally the realtime clock.
|
|
*
|
|
* Never mind that an RTC chip has 114 bytes (and often a whole
|
|
* other bank of an additional 128 bytes) of nice SRAM that is
|
|
* _designed_ to keep data - the POST will clear it. So we literally
|
|
* can just use the few bytes of actual time data, which means that
|
|
* we're really limited.
|
|
*
|
|
* It means, for example, that we can't use the seconds at all
|
|
* (since the time between the hang and the boot might be more
|
|
* than a minute), and we'd better not depend on the low bits of
|
|
* the minutes either.
|
|
*
|
|
* There are the wday fields etc, but I wouldn't guarantee those
|
|
* are dependable either. And if the date isn't valid, either the
|
|
* hw or POST will do strange things.
|
|
*
|
|
* So we're left with:
|
|
* - year: 0-99
|
|
* - month: 0-11
|
|
* - day-of-month: 1-28
|
|
* - hour: 0-23
|
|
* - min: (0-30)*2
|
|
*
|
|
* Giving us a total range of 0-16128000 (0xf61800), ie less
|
|
* than 24 bits of actual data we can save across reboots.
|
|
*
|
|
* And if your box can't boot in less than three minutes,
|
|
* you're screwed.
|
|
*
|
|
* Now, almost 24 bits of data is pitifully small, so we need
|
|
* to be pretty dense if we want to use it for anything nice.
|
|
* What we do is that instead of saving off nice readable info,
|
|
* we save off _hashes_ of information that we can hopefully
|
|
* regenerate after the reboot.
|
|
*
|
|
* In particular, this means that we might be unlucky, and hit
|
|
* a case where we have a hash collision, and we end up not
|
|
* being able to tell for certain exactly which case happened.
|
|
* But that's hopefully unlikely.
|
|
*
|
|
* What we do is to take the bits we can fit, and split them
|
|
* into three parts (16*997*1009 = 16095568), and use the values
|
|
* for:
|
|
* - 0-15: user-settable
|
|
* - 0-996: file + line number
|
|
* - 0-1008: device
|
|
*/
|
|
#define USERHASH (16)
|
|
#define FILEHASH (997)
|
|
#define DEVHASH (1009)
|
|
|
|
#define DEVSEED (7919)
|
|
|
|
bool pm_trace_rtc_abused __read_mostly;
|
|
EXPORT_SYMBOL_GPL(pm_trace_rtc_abused);
|
|
|
|
static unsigned int dev_hash_value;
|
|
|
|
static int set_magic_time(unsigned int user, unsigned int file, unsigned int device)
|
|
{
|
|
unsigned int n = user + USERHASH*(file + FILEHASH*device);
|
|
|
|
// June 7th, 2006
|
|
static struct rtc_time time = {
|
|
.tm_sec = 0,
|
|
.tm_min = 0,
|
|
.tm_hour = 0,
|
|
.tm_mday = 7,
|
|
.tm_mon = 5, // June - counting from zero
|
|
.tm_year = 106,
|
|
.tm_wday = 3,
|
|
.tm_yday = 160,
|
|
.tm_isdst = 1
|
|
};
|
|
|
|
time.tm_year = (n % 100);
|
|
n /= 100;
|
|
time.tm_mon = (n % 12);
|
|
n /= 12;
|
|
time.tm_mday = (n % 28) + 1;
|
|
n /= 28;
|
|
time.tm_hour = (n % 24);
|
|
n /= 24;
|
|
time.tm_min = (n % 20) * 3;
|
|
n /= 20;
|
|
mc146818_set_time(&time);
|
|
pm_trace_rtc_abused = true;
|
|
return n ? -1 : 0;
|
|
}
|
|
|
|
static unsigned int read_magic_time(void)
|
|
{
|
|
struct rtc_time time;
|
|
unsigned int val;
|
|
|
|
mc146818_get_time(&time);
|
|
pr_info("RTC time: %2d:%02d:%02d, date: %02d/%02d/%02d\n",
|
|
time.tm_hour, time.tm_min, time.tm_sec,
|
|
time.tm_mon + 1, time.tm_mday, time.tm_year % 100);
|
|
val = time.tm_year; /* 100 years */
|
|
if (val > 100)
|
|
val -= 100;
|
|
val += time.tm_mon * 100; /* 12 months */
|
|
val += (time.tm_mday-1) * 100 * 12; /* 28 month-days */
|
|
val += time.tm_hour * 100 * 12 * 28; /* 24 hours */
|
|
val += (time.tm_min / 3) * 100 * 12 * 28 * 24; /* 20 3-minute intervals */
|
|
return val;
|
|
}
|
|
|
|
/*
|
|
* This is just the sdbm hash function with a user-supplied
|
|
* seed and final size parameter.
|
|
*/
|
|
static unsigned int hash_string(unsigned int seed, const char *data, unsigned int mod)
|
|
{
|
|
unsigned char c;
|
|
while ((c = *data++) != 0) {
|
|
seed = (seed << 16) + (seed << 6) - seed + c;
|
|
}
|
|
return seed % mod;
|
|
}
|
|
|
|
void set_trace_device(struct device *dev)
|
|
{
|
|
dev_hash_value = hash_string(DEVSEED, dev_name(dev), DEVHASH);
|
|
}
|
|
EXPORT_SYMBOL(set_trace_device);
|
|
|
|
/*
|
|
* We could just take the "tracedata" index into the .tracedata
|
|
* section instead. Generating a hash of the data gives us a
|
|
* chance to work across kernel versions, and perhaps more
|
|
* importantly it also gives us valid/invalid check (ie we will
|
|
* likely not give totally bogus reports - if the hash matches,
|
|
* it's not any guarantee, but it's a high _likelihood_ that
|
|
* the match is valid).
|
|
*/
|
|
void generate_pm_trace(const void *tracedata, unsigned int user)
|
|
{
|
|
unsigned short lineno = *(unsigned short *)tracedata;
|
|
const char *file = *(const char **)(tracedata + 2);
|
|
unsigned int user_hash_value, file_hash_value;
|
|
|
|
user_hash_value = user % USERHASH;
|
|
file_hash_value = hash_string(lineno, file, FILEHASH);
|
|
set_magic_time(user_hash_value, file_hash_value, dev_hash_value);
|
|
}
|
|
EXPORT_SYMBOL(generate_pm_trace);
|
|
|
|
extern char __tracedata_start[], __tracedata_end[];
|
|
static int show_file_hash(unsigned int value)
|
|
{
|
|
int match;
|
|
char *tracedata;
|
|
|
|
match = 0;
|
|
for (tracedata = __tracedata_start ; tracedata < __tracedata_end ;
|
|
tracedata += 2 + sizeof(unsigned long)) {
|
|
unsigned short lineno = *(unsigned short *)tracedata;
|
|
const char *file = *(const char **)(tracedata + 2);
|
|
unsigned int hash = hash_string(lineno, file, FILEHASH);
|
|
if (hash != value)
|
|
continue;
|
|
pr_info(" hash matches %s:%u\n", file, lineno);
|
|
match++;
|
|
}
|
|
return match;
|
|
}
|
|
|
|
static int show_dev_hash(unsigned int value)
|
|
{
|
|
int match = 0;
|
|
struct list_head *entry;
|
|
|
|
device_pm_lock();
|
|
entry = dpm_list.prev;
|
|
while (entry != &dpm_list) {
|
|
struct device * dev = to_device(entry);
|
|
unsigned int hash = hash_string(DEVSEED, dev_name(dev), DEVHASH);
|
|
if (hash == value) {
|
|
dev_info(dev, "hash matches\n");
|
|
match++;
|
|
}
|
|
entry = entry->prev;
|
|
}
|
|
device_pm_unlock();
|
|
return match;
|
|
}
|
|
|
|
static unsigned int hash_value_early_read;
|
|
|
|
int show_trace_dev_match(char *buf, size_t size)
|
|
{
|
|
unsigned int value = hash_value_early_read / (USERHASH * FILEHASH);
|
|
int ret = 0;
|
|
struct list_head *entry;
|
|
|
|
/*
|
|
* It's possible that multiple devices will match the hash and we can't
|
|
* tell which is the culprit, so it's best to output them all.
|
|
*/
|
|
device_pm_lock();
|
|
entry = dpm_list.prev;
|
|
while (size && entry != &dpm_list) {
|
|
struct device *dev = to_device(entry);
|
|
unsigned int hash = hash_string(DEVSEED, dev_name(dev),
|
|
DEVHASH);
|
|
if (hash == value) {
|
|
int len = snprintf(buf, size, "%s\n",
|
|
dev_driver_string(dev));
|
|
if (len > size)
|
|
len = size;
|
|
buf += len;
|
|
ret += len;
|
|
size -= len;
|
|
}
|
|
entry = entry->prev;
|
|
}
|
|
device_pm_unlock();
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
pm_trace_notify(struct notifier_block *nb, unsigned long mode, void *_unused)
|
|
{
|
|
switch (mode) {
|
|
case PM_POST_HIBERNATION:
|
|
case PM_POST_SUSPEND:
|
|
if (pm_trace_rtc_abused) {
|
|
pm_trace_rtc_abused = false;
|
|
pr_warn("Possible incorrect RTC due to pm_trace, please use 'ntpdate' or 'rdate' to reset it.\n");
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block pm_trace_nb = {
|
|
.notifier_call = pm_trace_notify,
|
|
};
|
|
|
|
static int early_resume_init(void)
|
|
{
|
|
hash_value_early_read = read_magic_time();
|
|
register_pm_notifier(&pm_trace_nb);
|
|
return 0;
|
|
}
|
|
|
|
static int late_resume_init(void)
|
|
{
|
|
unsigned int val = hash_value_early_read;
|
|
unsigned int user, file, dev;
|
|
|
|
user = val % USERHASH;
|
|
val = val / USERHASH;
|
|
file = val % FILEHASH;
|
|
val = val / FILEHASH;
|
|
dev = val /* % DEVHASH */;
|
|
|
|
pr_info(" Magic number: %d:%d:%d\n", user, file, dev);
|
|
show_file_hash(file);
|
|
show_dev_hash(dev);
|
|
return 0;
|
|
}
|
|
|
|
core_initcall(early_resume_init);
|
|
late_initcall(late_resume_init);
|