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path: root/drivers/acpi/apei/erst.c
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Diffstat (limited to 'drivers/acpi/apei/erst.c')
-rw-r--r--drivers/acpi/apei/erst.c235
1 files changed, 191 insertions, 44 deletions
diff --git a/drivers/acpi/apei/erst.c b/drivers/acpi/apei/erst.c
index c02005abce4..d6cb0ff6988 100644
--- a/drivers/acpi/apei/erst.c
+++ b/drivers/acpi/apei/erst.c
@@ -430,6 +430,22 @@ 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;
@@ -444,26 +460,179 @@ 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)
{
@@ -704,56 +873,34 @@ 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);