mirror of
https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
synced 2026-10-29 19:21:31 -04:00
ACPI, APEI, Add ERST record ID cache
APEI ERST firmware interface and implementation has no multiple users in mind. For example, if there is four records in storage with ID: 1, 2, 3 and 4, if two ERST readers enumerate the records via GET_NEXT_RECORD_ID as follow, reader 1 reader 2 1 2 3 4 -1 -1 where -1 signals there is no more record ID. Reader 1 has no chance to check record 2 and 4, while reader 2 has no chance to check record 1 and 3. And any other GET_NEXT_RECORD_ID will return -1, that is, other readers will has no chance to check any record even they are not cleared by anyone. This makes raw GET_NEXT_RECORD_ID not suitable for used by multiple users. To solve the issue, an in-memory ERST record ID cache is designed and implemented. When enumerating record ID, the ID returned by GET_NEXT_RECORD_ID is added into cache in addition to be returned to caller. So other readers can check the cache to get all record ID available. Signed-off-by: Huang Ying <[email protected]> Reviewed-by: Andi Kleen <[email protected]> Signed-off-by: Len Brown <[email protected]>
This commit is contained in:
Huang Ying
Len Brown
parent
dd9c1549ed
commit
885b976fad
4 changed files with 241 additions and 65 deletions
|
|
@ -43,12 +43,27 @@ static DEFINE_MUTEX(erst_dbg_mutex);
|
|||
|
||||
static int erst_dbg_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
int rc, *pos;
|
||||
|
||||
if (erst_disable)
|
||||
return -ENODEV;
|
||||
|
||||
pos = (int *)&file->private_data;
|
||||
|
||||
rc = erst_get_record_id_begin(pos);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static int erst_dbg_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
erst_get_record_id_end();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static long erst_dbg_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
int rc;
|
||||
|
|
@ -79,18 +94,20 @@ static long erst_dbg_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
|
|||
static ssize_t erst_dbg_read(struct file *filp, char __user *ubuf,
|
||||
size_t usize, loff_t *off)
|
||||
{
|
||||
int rc;
|
||||
int rc, *pos;
|
||||
ssize_t len = 0;
|
||||
u64 id;
|
||||
|
||||
if (*off != 0)
|
||||
if (*off)
|
||||
return -EINVAL;
|
||||
|
||||
if (mutex_lock_interruptible(&erst_dbg_mutex) != 0)
|
||||
return -EINTR;
|
||||
|
||||
pos = (int *)&filp->private_data;
|
||||
|
||||
retry_next:
|
||||
rc = erst_get_next_record_id(&id);
|
||||
rc = erst_get_record_id_next(pos, &id);
|
||||
if (rc)
|
||||
goto out;
|
||||
/* no more record */
|
||||
|
|
@ -181,6 +198,7 @@ out:
|
|||
static const struct file_operations erst_dbg_ops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = erst_dbg_open,
|
||||
.release = erst_dbg_release,
|
||||
.read = erst_dbg_read,
|
||||
.write = erst_dbg_write,
|
||||
.unlocked_ioctl = erst_dbg_ioctl,
|
||||
|
|
|
|||
|
|
@ -429,6 +429,22 @@ ssize_t erst_get_record_count(void)
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(erst_get_record_count);
|
||||
|
||||
#define ERST_RECORD_ID_CACHE_SIZE_MIN 16
|
||||
#define ERST_RECORD_ID_CACHE_SIZE_MAX 1024
|
||||
|
||||
struct erst_record_id_cache {
|
||||
struct mutex lock;
|
||||
u64 *entries;
|
||||
int len;
|
||||
int size;
|
||||
int refcount;
|
||||
};
|
||||
|
||||
static struct erst_record_id_cache erst_record_id_cache = {
|
||||
.lock = __MUTEX_INITIALIZER(erst_record_id_cache.lock),
|
||||
.refcount = 0,
|
||||
};
|
||||
|
||||
static int __erst_get_next_record_id(u64 *record_id)
|
||||
{
|
||||
struct apei_exec_context ctx;
|
||||
|
|
@ -443,26 +459,179 @@ static int __erst_get_next_record_id(u64 *record_id)
|
|||
return 0;
|
||||
}
|
||||
|
||||
int erst_get_record_id_begin(int *pos)
|
||||
{
|
||||
int rc;
|
||||
|
||||
if (erst_disable)
|
||||
return -ENODEV;
|
||||
|
||||
rc = mutex_lock_interruptible(&erst_record_id_cache.lock);
|
||||
if (rc)
|
||||
return rc;
|
||||
erst_record_id_cache.refcount++;
|
||||
mutex_unlock(&erst_record_id_cache.lock);
|
||||
|
||||
*pos = 0;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(erst_get_record_id_begin);
|
||||
|
||||
/* erst_record_id_cache.lock must be held by caller */
|
||||
static int __erst_record_id_cache_add_one(void)
|
||||
{
|
||||
u64 id, prev_id, first_id;
|
||||
int i, rc;
|
||||
u64 *entries;
|
||||
unsigned long flags;
|
||||
|
||||
id = prev_id = first_id = APEI_ERST_INVALID_RECORD_ID;
|
||||
retry:
|
||||
raw_spin_lock_irqsave(&erst_lock, flags);
|
||||
rc = __erst_get_next_record_id(&id);
|
||||
raw_spin_unlock_irqrestore(&erst_lock, flags);
|
||||
if (rc == -ENOENT)
|
||||
return 0;
|
||||
if (rc)
|
||||
return rc;
|
||||
if (id == APEI_ERST_INVALID_RECORD_ID)
|
||||
return 0;
|
||||
/* can not skip current ID, or loop back to first ID */
|
||||
if (id == prev_id || id == first_id)
|
||||
return 0;
|
||||
if (first_id == APEI_ERST_INVALID_RECORD_ID)
|
||||
first_id = id;
|
||||
prev_id = id;
|
||||
|
||||
entries = erst_record_id_cache.entries;
|
||||
for (i = 0; i < erst_record_id_cache.len; i++) {
|
||||
if (entries[i] == id)
|
||||
break;
|
||||
}
|
||||
/* record id already in cache, try next */
|
||||
if (i < erst_record_id_cache.len)
|
||||
goto retry;
|
||||
if (erst_record_id_cache.len >= erst_record_id_cache.size) {
|
||||
int new_size, alloc_size;
|
||||
u64 *new_entries;
|
||||
|
||||
new_size = erst_record_id_cache.size * 2;
|
||||
new_size = clamp_val(new_size, ERST_RECORD_ID_CACHE_SIZE_MIN,
|
||||
ERST_RECORD_ID_CACHE_SIZE_MAX);
|
||||
if (new_size <= erst_record_id_cache.size) {
|
||||
if (printk_ratelimit())
|
||||
pr_warning(FW_WARN ERST_PFX
|
||||
"too many record ID!\n");
|
||||
return 0;
|
||||
}
|
||||
alloc_size = new_size * sizeof(entries[0]);
|
||||
if (alloc_size < PAGE_SIZE)
|
||||
new_entries = kmalloc(alloc_size, GFP_KERNEL);
|
||||
else
|
||||
new_entries = vmalloc(alloc_size);
|
||||
if (!new_entries)
|
||||
return -ENOMEM;
|
||||
memcpy(new_entries, entries,
|
||||
erst_record_id_cache.len * sizeof(entries[0]));
|
||||
if (erst_record_id_cache.size < PAGE_SIZE)
|
||||
kfree(entries);
|
||||
else
|
||||
vfree(entries);
|
||||
erst_record_id_cache.entries = entries = new_entries;
|
||||
erst_record_id_cache.size = new_size;
|
||||
}
|
||||
entries[i] = id;
|
||||
erst_record_id_cache.len++;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
/*
|
||||
* Get the record ID of an existing error record on the persistent
|
||||
* storage. If there is no error record on the persistent storage, the
|
||||
* returned record_id is APEI_ERST_INVALID_RECORD_ID.
|
||||
*/
|
||||
int erst_get_next_record_id(u64 *record_id)
|
||||
int erst_get_record_id_next(int *pos, u64 *record_id)
|
||||
{
|
||||
int rc;
|
||||
unsigned long flags;
|
||||
int rc = 0;
|
||||
u64 *entries;
|
||||
|
||||
if (erst_disable)
|
||||
return -ENODEV;
|
||||
|
||||
raw_spin_lock_irqsave(&erst_lock, flags);
|
||||
rc = __erst_get_next_record_id(record_id);
|
||||
raw_spin_unlock_irqrestore(&erst_lock, flags);
|
||||
/* must be enclosed by erst_get_record_id_begin/end */
|
||||
BUG_ON(!erst_record_id_cache.refcount);
|
||||
BUG_ON(*pos < 0 || *pos > erst_record_id_cache.len);
|
||||
|
||||
mutex_lock(&erst_record_id_cache.lock);
|
||||
entries = erst_record_id_cache.entries;
|
||||
for (; *pos < erst_record_id_cache.len; (*pos)++)
|
||||
if (entries[*pos] != APEI_ERST_INVALID_RECORD_ID)
|
||||
break;
|
||||
/* found next record id in cache */
|
||||
if (*pos < erst_record_id_cache.len) {
|
||||
*record_id = entries[*pos];
|
||||
(*pos)++;
|
||||
goto out_unlock;
|
||||
}
|
||||
|
||||
/* Try to add one more record ID to cache */
|
||||
rc = __erst_record_id_cache_add_one();
|
||||
if (rc < 0)
|
||||
goto out_unlock;
|
||||
/* successfully add one new ID */
|
||||
if (rc == 1) {
|
||||
*record_id = erst_record_id_cache.entries[*pos];
|
||||
(*pos)++;
|
||||
rc = 0;
|
||||
} else {
|
||||
*pos = -1;
|
||||
*record_id = APEI_ERST_INVALID_RECORD_ID;
|
||||
}
|
||||
out_unlock:
|
||||
mutex_unlock(&erst_record_id_cache.lock);
|
||||
|
||||
return rc;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(erst_get_next_record_id);
|
||||
EXPORT_SYMBOL_GPL(erst_get_record_id_next);
|
||||
|
||||
/* erst_record_id_cache.lock must be held by caller */
|
||||
static void __erst_record_id_cache_compact(void)
|
||||
{
|
||||
int i, wpos = 0;
|
||||
u64 *entries;
|
||||
|
||||
if (erst_record_id_cache.refcount)
|
||||
return;
|
||||
|
||||
entries = erst_record_id_cache.entries;
|
||||
for (i = 0; i < erst_record_id_cache.len; i++) {
|
||||
if (entries[i] == APEI_ERST_INVALID_RECORD_ID)
|
||||
continue;
|
||||
if (wpos != i)
|
||||
memcpy(&entries[wpos], &entries[i], sizeof(entries[i]));
|
||||
wpos++;
|
||||
}
|
||||
erst_record_id_cache.len = wpos;
|
||||
}
|
||||
|
||||
void erst_get_record_id_end(void)
|
||||
{
|
||||
/*
|
||||
* erst_disable != 0 should be detected by invoker via the
|
||||
* return value of erst_get_record_id_begin/next, so this
|
||||
* function should not be called for erst_disable != 0.
|
||||
*/
|
||||
BUG_ON(erst_disable);
|
||||
|
||||
mutex_lock(&erst_record_id_cache.lock);
|
||||
erst_record_id_cache.refcount--;
|
||||
BUG_ON(erst_record_id_cache.refcount < 0);
|
||||
__erst_record_id_cache_compact();
|
||||
mutex_unlock(&erst_record_id_cache.lock);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(erst_get_record_id_end);
|
||||
|
||||
static int __erst_write_to_storage(u64 offset)
|
||||
{
|
||||
|
|
@ -703,56 +872,34 @@ ssize_t erst_read(u64 record_id, struct cper_record_header *record,
|
|||
}
|
||||
EXPORT_SYMBOL_GPL(erst_read);
|
||||
|
||||
/*
|
||||
* If return value > buflen, the buffer size is not big enough,
|
||||
* else if return value = 0, there is no more record to read,
|
||||
* else if return value < 0, something goes wrong,
|
||||
* else everything is OK, and return value is record length
|
||||
*/
|
||||
ssize_t erst_read_next(struct cper_record_header *record, size_t buflen)
|
||||
{
|
||||
int rc;
|
||||
ssize_t len;
|
||||
unsigned long flags;
|
||||
u64 record_id;
|
||||
|
||||
if (erst_disable)
|
||||
return -ENODEV;
|
||||
|
||||
raw_spin_lock_irqsave(&erst_lock, flags);
|
||||
rc = __erst_get_next_record_id(&record_id);
|
||||
if (rc) {
|
||||
raw_spin_unlock_irqrestore(&erst_lock, flags);
|
||||
return rc;
|
||||
}
|
||||
/* no more record */
|
||||
if (record_id == APEI_ERST_INVALID_RECORD_ID) {
|
||||
raw_spin_unlock_irqrestore(&erst_lock, flags);
|
||||
return 0;
|
||||
}
|
||||
|
||||
len = __erst_read(record_id, record, buflen);
|
||||
raw_spin_unlock_irqrestore(&erst_lock, flags);
|
||||
|
||||
return len;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(erst_read_next);
|
||||
|
||||
int erst_clear(u64 record_id)
|
||||
{
|
||||
int rc;
|
||||
int rc, i;
|
||||
unsigned long flags;
|
||||
u64 *entries;
|
||||
|
||||
if (erst_disable)
|
||||
return -ENODEV;
|
||||
|
||||
rc = mutex_lock_interruptible(&erst_record_id_cache.lock);
|
||||
if (rc)
|
||||
return rc;
|
||||
raw_spin_lock_irqsave(&erst_lock, flags);
|
||||
if (erst_erange.attr & ERST_RANGE_NVRAM)
|
||||
rc = __erst_clear_from_nvram(record_id);
|
||||
else
|
||||
rc = __erst_clear_from_storage(record_id);
|
||||
raw_spin_unlock_irqrestore(&erst_lock, flags);
|
||||
|
||||
if (rc)
|
||||
goto out;
|
||||
entries = erst_record_id_cache.entries;
|
||||
for (i = 0; i < erst_record_id_cache.len; i++) {
|
||||
if (entries[i] == record_id)
|
||||
entries[i] = APEI_ERST_INVALID_RECORD_ID;
|
||||
}
|
||||
__erst_record_id_cache_compact();
|
||||
out:
|
||||
mutex_unlock(&erst_record_id_cache.lock);
|
||||
return rc;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(erst_clear);
|
||||
|
|
|
|||
Loading…
Reference in a new issue