[S390] zcrypt: fix request timeout handling
Under very high load zcrypt requests may timeout while waiting on the
request queue. Modify zcrypt that timeouts are based on crypto adapter
responses. A timeout occurs only if a crypto adapter does not respond
within a given time frame to sumitted requests.
Signed-off-by: Ralph Wuerthner <rwuerthn@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/crypto/ap_bus.h b/drivers/s390/crypto/ap_bus.h
index 008559e..87c2d64 100644
--- a/drivers/s390/crypto/ap_bus.h
+++ b/drivers/s390/crypto/ap_bus.h
@@ -33,6 +33,7 @@
#define AP_DEVICES 64 /* Number of AP devices. */
#define AP_DOMAINS 16 /* Number of AP domains. */
#define AP_MAX_RESET 90 /* Maximum number of resets. */
+#define AP_RESET_TIMEOUT (HZ/2) /* Time in ticks for reset timeouts. */
#define AP_CONFIG_TIME 30 /* Time in seconds between AP bus rescans. */
#define AP_POLL_TIME 1 /* Time in ticks between receive polls. */
@@ -83,6 +84,13 @@
#define AP_DEVICE_TYPE_CEX2A 6
#define AP_DEVICE_TYPE_CEX2C 7
+/**
+ * AP reset flag states
+ */
+#define AP_RESET_IGNORE 0 /* request timeout will be ignored */
+#define AP_RESET_ARMED 1 /* request timeout timer is active */
+#define AP_RESET_DO 2 /* AP reset required */
+
struct ap_device;
struct ap_message;
@@ -95,6 +103,7 @@
/* receive is called from tasklet context */
void (*receive)(struct ap_device *, struct ap_message *,
struct ap_message *);
+ int request_timeout; /* request timeout in jiffies */
};
#define to_ap_drv(x) container_of((x), struct ap_driver, driver)
@@ -112,6 +121,8 @@
int queue_depth; /* AP queue depth.*/
int device_type; /* AP device type. */
int unregistered; /* marks AP device as unregistered */
+ struct timer_list timeout; /* Timer for request timeouts. */
+ int reset; /* Reset required after req. timeout. */
int queue_count; /* # messages currently on AP queue. */