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s390: remove runtime instrumentation interrupts

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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>
This commit is contained in:
Martin Schwidefsky
2015-11-02 14:03:46 +01:00
parent e510f681d2
commit b38feccd66
6 changed files with 3 additions and 70 deletions
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64
arch/s390/kernel/runtime_instr.c
View File

@@ -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);