[S390] stp support.

Add support for clock synchronization with the server time protocol.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

drivers/s390/cio/chsc.c

@@ -874,3 +874,52 @@ chsc_determine_css_characteristics(void)
 
 EXPORT_SYMBOL_GPL(css_general_characteristics);
 EXPORT_SYMBOL_GPL(css_chsc_characteristics);
+
+int chsc_sstpc(void *page, unsigned int op, u16 ctrl)
+{
+	struct {
+		struct chsc_header request;
+		unsigned int rsvd0;
+		unsigned int op : 8;
+		unsigned int rsvd1 : 8;
+		unsigned int ctrl : 16;
+		unsigned int rsvd2[5];
+		struct chsc_header response;
+		unsigned int rsvd3[7];
+	} __attribute__ ((packed)) *rr;
+	int rc;
+
+	memset(page, 0, PAGE_SIZE);
+	rr = page;
+	rr->request.length = 0x0020;
+	rr->request.code = 0x0033;
+	rr->op = op;
+	rr->ctrl = ctrl;
+	rc = chsc(rr);
+	if (rc)
+		return -EIO;
+	rc = (rr->response.code == 0x0001) ? 0 : -EIO;
+	return rc;
+}
+
+int chsc_sstpi(void *page, void *result, size_t size)
+{
+	struct {
+		struct chsc_header request;
+		unsigned int rsvd0[3];
+		struct chsc_header response;
+		char data[size];
+	} __attribute__ ((packed)) *rr;
+	int rc;
+
+	memset(page, 0, PAGE_SIZE);
+	rr = page;
+	rr->request.length = 0x0010;
+	rr->request.code = 0x0038;
+	rc = chsc(rr);
+	if (rc)
+		return -EIO;
+	memcpy(result, &rr->data, size);
+	return (rr->response.code == 0x0001) ? 0 : -EIO;
+}
+

drivers/s390/s390mach.c

@@ -458,6 +458,10 @@ s390_do_machine_check(struct pt_regs *regs)
 			etr_sync_check();
 		if (S390_lowcore.external_damage_code & (1U << ED_ETR_SWITCH))
 			etr_switch_to_local();
+		if (S390_lowcore.external_damage_code & (1U << ED_STP_SYNC))
+			stp_sync_check();
+		if (S390_lowcore.external_damage_code & (1U << ED_STP_ISLAND))
+			stp_island_check();
 	}
 
 	if (mci->se)

drivers/s390/s390mach.h

@@ -112,6 +112,9 @@ static inline int stcrw(struct crw *pcrw )
 #define ED_ETR_SYNC	12	/* External damage ETR sync check */
 #define ED_ETR_SWITCH	13	/* External damage ETR switch to local */
 
+#define ED_STP_SYNC	7	/* External damage STP sync check */
+#define ED_STP_ISLAND	6	/* External damage STP island check */
+
 struct pt_regs;
 
 void s390_handle_mcck(void);

include/asm-s390/etr.h

@@ -122,7 +122,7 @@ struct etr_aib {
 } __attribute__ ((packed,aligned(8)));
 
 /* ETR interruption parameter */
-struct etr_interruption_parameter {
+struct etr_irq_parm {
 	unsigned int _pad0	: 8;
 	unsigned int pc0	: 1;	/* port 0 state change */
 	unsigned int pc1	: 1;	/* port 1 state change */
@@ -213,7 +213,46 @@ static inline int etr_ptff(void *ptff_block, unsigned int func)
 #define ETR_PTFF_SGS	0x43	/* set gross steering rate */
 
 /* Functions needed by the machine check handler */
-extern void etr_switch_to_local(void);
-extern void etr_sync_check(void);
+void etr_switch_to_local(void);
+void etr_sync_check(void);
+
+/* STP interruption parameter */
+struct stp_irq_parm {
+	unsigned int _pad0	: 14;
+	unsigned int tsc	: 1;	/* Timing status change */
+	unsigned int lac	: 1;	/* Link availability change */
+	unsigned int tcpc	: 1;	/* Time control parameter change */
+	unsigned int _pad2	: 15;
+} __attribute__ ((packed));
+
+#define STP_OP_SYNC	1
+#define STP_OP_CTRL	3
+
+struct stp_sstpi {
+	unsigned int rsvd0;
+	unsigned int rsvd1 : 8;
+	unsigned int stratum : 8;
+	unsigned int vbits : 16;
+	unsigned int leaps : 16;
+	unsigned int tmd : 4;
+	unsigned int ctn : 4;
+	unsigned int rsvd2 : 3;
+	unsigned int c : 1;
+	unsigned int tst : 4;
+	unsigned int tzo : 16;
+	unsigned int dsto : 16;
+	unsigned int ctrl : 16;
+	unsigned int rsvd3 : 16;
+	unsigned int tto;
+	unsigned int rsvd4;
+	unsigned int ctnid[3];
+	unsigned int rsvd5;
+	unsigned int todoff[4];
+	unsigned int rsvd6[48];
+} __attribute__ ((packed));
+
+/* Functions needed by the machine check handler */
+void stp_sync_check(void);
+void stp_island_check(void);
 
 #endif /* __S390_ETR_H */