static int op_powerpc_setup(void)
{
int err;
op_per_cpu_rc = 0;
err = reserve_pmc_hardware(op_handle_interrupt);
if (err)
return err;
op_per_cpu_rc = model->reg_setup(ctr, &sys, model->num_counters);
if (op_per_cpu_rc)
goto out;
on_each_cpu(op_powerpc_cpu_setup, NULL, 1);
out: if (op_per_cpu_rc) {
release_pmc_hardware();
}
return op_per_cpu_rc;
}
static int op_powerpc_setup(void)
{
int err;
op_per_cpu_rc = 0;
/* Grab the hardware */
err = reserve_pmc_hardware(op_handle_interrupt);
if (err)
return err;
/* Pre-compute the values to stuff in the hardware registers. */
op_per_cpu_rc = model->reg_setup(ctr, &sys, model->num_counters);
if (op_per_cpu_rc)
goto out;
/* Configure the registers on all cpus. If an error occurs on one
* of the cpus, op_per_cpu_rc will be set to the error */
on_each_cpu(op_powerpc_cpu_setup, NULL, 1);
out: if (op_per_cpu_rc) {
/* error on setup release the performance counter hardware */
release_pmc_hardware();
}
return op_per_cpu_rc;
}
/*
* proc handler for /proc/sys/tile/userspace_perf_counters
*/
int userspace_perf_counters_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
loff_t *ppos)
{
int ret, changed;
unsigned int old_userspace_perf_counters;
/* Read /proc/sys/tile/userspace_perf_counters */
if (!write) {
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
return ret;
}
/* Write /proc/sys/tile/userspace_perf_counters */
old_userspace_perf_counters = userspace_perf_counters;
ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
changed = userspace_perf_counters != old_userspace_perf_counters;
/*
* Do something only if the value of userspace_perf_counters
* is changed.
*/
if (ret == 0 && changed) {
if (userspace_perf_counters == 1) {
if (reserve_pmc_hardware(userspace_perf_handler)) {
pr_warning("PMC hardware busy (reserved "
"by perf_event or oprofile)\n");
userspace_perf_counters =
old_userspace_perf_counters;
return -EBUSY;
}
} else
release_pmc_hardware();
/* Set MPL_PERF_COUNT_SET_X on each tile. */
on_each_cpu(set_perf_count_sprs, NULL, 1);
}
return ret;
}
static void op_powerpc_shutdown(void)
{
release_pmc_hardware();
}
