s390/ap: Extend struct ap_queue_status with some convenience fields

Sometimes there is a different view of the AP status word
needed. So here is slight rework of the struct ap_queue_status
to open up the possibility to have different ways of accessing
the AP status bits and fields.

The new struct ap_queue_status

struct ap_queue_status {
union {
unsigned int value : 32;
struct {
unsigned int status_bits : 8;
unsigned int rc : 8;
unsigned int : 16;
};
struct {
unsigned int queue_empty : 1;
unsigned int replies_waiting : 1;
unsigned int queue_full : 1;
unsigned int : 3;
unsigned int async : 1;
unsigned int irq_enabled : 1;
unsigned int response_code : 8;
unsigned int : 16;
};
};
};

comprises the old struct ap_queue_status but extends it
to have this also accessible as an unsigned int required
for example for a simple print or trace of the whole value.

Note that this rework is fully backward compatible to the
existing code exploiting the struct ap_queue_status.

Signed-off-by: Harald Freudenberger <[e-mail]>
Reviewed-by: Anthony Krowiak <[e-mail]>
Reviewed-by: Holger Dengler <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>

arch/s390/include/asm/ap.h

···
  * The ap queue status word is returned by all three AP functions
  * (PQAP, NQAP and DQAP).  There's a set of flags in the first
  * byte, followed by a 1 byte response code.
+ *
+ * For convenience the 'value' field is a 32 bit access of the
+ * whole status and the 'status_bits' and 'rc' fields comprise
+ * the leftmost 8 status bits and the response_code.
  */
 struct ap_queue_status {
-	unsigned int queue_empty	: 1;
-	unsigned int replies_waiting	: 1;
-	unsigned int queue_full		: 1;
-	unsigned int			: 3;
-	unsigned int async		: 1;
-	unsigned int irq_enabled	: 1;
-	unsigned int response_code	: 8;
-	unsigned int			: 16;
+	union {
+		unsigned int value			: 32;
+		struct {
+			unsigned int status_bits	: 8;
+			unsigned int rc			: 8;
+			unsigned int			: 16;
+		};
+		struct {
+			unsigned int queue_empty	: 1;
+			unsigned int replies_waiting	: 1;
+			unsigned int queue_full		: 1;
+			unsigned int			: 3;
+			unsigned int async		: 1;
+			unsigned int irq_enabled	: 1;
+			unsigned int response_code	: 8;
+			unsigned int			: 16;
+		};
+	};
 };
 
 /*