s390: remove runtime instrumentation interrupts

The external interrupts for runtime instrumentation buffer-full
and runtime instrumentation halted are unused and have no current
user. Remove the support and ignore the second parameter of the
s390_runtime_instr system call from now on.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/include/asm/cpu_mf.h

@@ -22,15 +22,10 @@
 #define CPU_MF_INT_SF_LSDA	(1 << 22)	/* loss of sample data alert */
 #define CPU_MF_INT_CF_CACA	(1 <<  7)	/* counter auth. change alert */
 #define CPU_MF_INT_CF_LCDA	(1 <<  6)	/* loss of counter data alert */
-#define CPU_MF_INT_RI_HALTED	(1 <<  5)	/* run-time instr. halted */
-#define CPU_MF_INT_RI_BUF_FULL	(1 <<  4)	/* run-time instr. program
-						   buffer full */
-
 #define CPU_MF_INT_CF_MASK	(CPU_MF_INT_CF_CACA|CPU_MF_INT_CF_LCDA)
 #define CPU_MF_INT_SF_MASK	(CPU_MF_INT_SF_IAE|CPU_MF_INT_SF_ISE|	\
 				 CPU_MF_INT_SF_PRA|CPU_MF_INT_SF_SACA|	\
 				 CPU_MF_INT_SF_LSDA)
-#define CPU_MF_INT_RI_MASK	(CPU_MF_INT_RI_HALTED|CPU_MF_INT_RI_BUF_FULL)
 
 /* CPU measurement facility support */
 static inline int cpum_cf_avail(void)

arch/s390/include/asm/irq.h

@@ -47,7 +47,6 @@ enum interruption_class {
 	IRQEXT_IUC,
 	IRQEXT_CMS,
 	IRQEXT_CMC,
-	IRQEXT_CMR,
 	IRQEXT_FTP,
 	IRQIO_CIO,
 	IRQIO_QAI,

arch/s390/include/asm/processor.h

@@ -107,7 +107,6 @@ struct thread_struct {
 	struct list_head list;
 	/* cpu runtime instrumentation */
 	struct runtime_instr_cb *ri_cb;
-	int ri_signum;
 	unsigned char trap_tdb[256];	/* Transaction abort diagnose block */
 };
 

arch/s390/kernel/irq.c

@@ -69,7 +69,6 @@ static const struct irq_class irqclass_sub_desc[] = {
 	{.irq = IRQEXT_IUC, .name = "IUC", .desc = "[EXT] IUCV"},
 	{.irq = IRQEXT_CMS, .name = "CMS", .desc = "[EXT] CPU-Measurement: Sampling"},
 	{.irq = IRQEXT_CMC, .name = "CMC", .desc = "[EXT] CPU-Measurement: Counter"},
-	{.irq = IRQEXT_CMR, .name = "CMR", .desc = "[EXT] CPU-Measurement: RI"},
 	{.irq = IRQEXT_FTP, .name = "FTP", .desc = "[EXT] HMC FTP Service"},
 	{.irq = IRQIO_CIO,  .name = "CIO", .desc = "[I/O] Common I/O Layer Interrupt"},
 	{.irq = IRQIO_QAI,  .name = "QAI", .desc = "[I/O] QDIO Adapter Interrupt"},

arch/s390/kernel/process.c

@@ -171,7 +171,6 @@ int copy_thread(unsigned long clone_flags, unsigned long new_stackp,
 
 	/* Don't copy runtime instrumentation info */
 	p->thread.ri_cb = NULL;
-	p->thread.ri_signum = 0;
 	frame->childregs.psw.mask &= ~PSW_MASK_RI;
 
 	/* Set a new TLS ?  */

arch/s390/kernel/runtime_instr.c

@@ -18,11 +18,6 @@
 /* empty control block to disable RI by loading it */
 struct runtime_instr_cb runtime_instr_empty_cb;
 
-static int runtime_instr_avail(void)
-{
-	return test_facility(64);
-}
-
 static void disable_runtime_instr(void)
 {
 	struct pt_regs *regs = task_pt_regs(current);
@@ -40,7 +35,6 @@ static void disable_runtime_instr(void)
 static void init_runtime_instr_cb(struct runtime_instr_cb *cb)
 {
 	cb->buf_limit = 0xfff;
-	cb->int_requested = 1;
 	cb->pstate = 1;
 	cb->pstate_set_buf = 1;
 	cb->pstate_sample = 1;
@@ -57,46 +51,14 @@ void exit_thread_runtime_instr(void)
 		return;
 	disable_runtime_instr();
 	kfree(task->thread.ri_cb);
-	task->thread.ri_signum = 0;
 	task->thread.ri_cb = NULL;
 }
 
-static void runtime_instr_int_handler(struct ext_code ext_code,
-				unsigned int param32, unsigned long param64)
-{
-	struct siginfo info;
-
-	if (!(param32 & CPU_MF_INT_RI_MASK))
-		return;
-
-	inc_irq_stat(IRQEXT_CMR);
-
-	if (!current->thread.ri_cb)
-		return;
-	if (current->thread.ri_signum < SIGRTMIN ||
-	    current->thread.ri_signum > SIGRTMAX) {
-		WARN_ON_ONCE(1);
-		return;
-	}
-
-	memset(&info, 0, sizeof(info));
-	info.si_signo = current->thread.ri_signum;
-	info.si_code = SI_QUEUE;
-	if (param32 & CPU_MF_INT_RI_BUF_FULL)
-		info.si_int = ENOBUFS;
-	else if (param32 & CPU_MF_INT_RI_HALTED)
-		info.si_int = ECANCELED;
-	else
-		return; /* unknown reason */
-
-	send_sig_info(current->thread.ri_signum, &info, current);
-}
-
-SYSCALL_DEFINE2(s390_runtime_instr, int, command, int, signum)
+SYSCALL_DEFINE1(s390_runtime_instr, int, command)
 {
 	struct runtime_instr_cb *cb;
 
-	if (!runtime_instr_avail())
+	if (!test_facility(64))
 		return -EOPNOTSUPP;
 
 	if (command == S390_RUNTIME_INSTR_STOP) {
@@ -106,8 +68,7 @@ SYSCALL_DEFINE2(s390_runtime_instr, int, command, int, signum)
 		return 0;
 	}
 
-	if (command != S390_RUNTIME_INSTR_START ||
-	    (signum < SIGRTMIN || signum > SIGRTMAX))
+	if (command != S390_RUNTIME_INSTR_START)
 		return -EINVAL;
 
 	if (!current->thread.ri_cb) {
@@ -120,7 +81,6 @@ SYSCALL_DEFINE2(s390_runtime_instr, int, command, int, signum)
 	}
 
 	init_runtime_instr_cb(cb);
-	current->thread.ri_signum = signum;
 
 	/* now load the control block to make it available */
 	preempt_disable();
@@ -129,21 +89,3 @@ SYSCALL_DEFINE2(s390_runtime_instr, int, command, int, signum)
 	preempt_enable();
 	return 0;
 }
-
-static int __init runtime_instr_init(void)
-{
-	int rc;
-
-	if (!runtime_instr_avail())
-		return 0;
-
-	irq_subclass_register(IRQ_SUBCLASS_MEASUREMENT_ALERT);
-	rc = register_external_irq(EXT_IRQ_MEASURE_ALERT,
-				   runtime_instr_int_handler);
-	if (rc)
-		irq_subclass_unregister(IRQ_SUBCLASS_MEASUREMENT_ALERT);
-	else
-		pr_info("Runtime instrumentation facility initialized\n");
-	return rc;
-}
-device_initcall(runtime_instr_init);