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Commit 99c64b66 authored by Hendrik Brueckner's avatar Hendrik Brueckner Committed by Martin Schwidefsky
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s390/perf: Add service level information for CPU-Measurement Facilities 



Register a service level handler to report information about available
CPU-Measurement facilities.

Signed-off-by: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent e28bb79d

arch/s390/kernel/perf_event.c

+57 −1
Original line number Diff line number Diff line
@@ -16,17 +16,19 @@ 
#include <linux/kvm_host.h>

#include <linux/percpu.h>

#include <linux/export.h>

#include <linux/seq_file.h>

#include <linux/spinlock.h>

#include <linux/sysfs.h>

#include <asm/irq.h>

#include <asm/cpu_mf.h>

#include <asm/lowcore.h>

#include <asm/processor.h>

#include <asm/sysinfo.h>



const char *perf_pmu_name(void)

{

	if (cpum_cf_avail() || cpum_sf_avail())

		return "CPU-measurement facilities (CPUMF)";

		return "CPU-Measurement Facilities (CPU-MF)";

	return "pmu";

}

EXPORT_SYMBOL(perf_pmu_name);
@@ -138,6 +140,60 @@ void perf_event_print_debug(void) 
	local_irq_restore(flags);

}



/* Service level infrastructure */

static void sl_print_counter(struct seq_file *m)

{

	struct cpumf_ctr_info ci;



	memset(&ci, 0, sizeof(ci));

	if (qctri(&ci))

		return;



	seq_printf(m, "CPU-MF: Counter facility: version=%u.%u "

		   "authorization=%04x\n", ci.cfvn, ci.csvn, ci.auth_ctl);

}



static void sl_print_sampling(struct seq_file *m)

{

	struct hws_qsi_info_block si;



	memset(&si, 0, sizeof(si));

	if (qsi(&si))

		return;



	if (!si.as && !si.ad)

		return;



	seq_printf(m, "CPU-MF: Sampling facility: min_rate=%lu max_rate=%lu"

		   " cpu_speed=%u\n", si.min_sampl_rate, si.max_sampl_rate,

		   si.cpu_speed);

	if (si.as)

		seq_printf(m, "CPU-MF: Sampling facility: mode=basic"

			   " sample_size=%u\n", si.bsdes);

	if (si.ad)

		seq_printf(m, "CPU-MF: Sampling facility: mode=diagnostic"

			   " sample_size=%u\n", si.dsdes);

}



static void service_level_perf_print(struct seq_file *m,

				     struct service_level *sl)

{

	if (cpum_cf_avail())

		sl_print_counter(m);

	if (cpum_sf_avail())

		sl_print_sampling(m);

}



static struct service_level service_level_perf = {

	.seq_print = service_level_perf_print,

};



static int __init service_level_perf_register(void)

{

	return register_service_level(&service_level_perf);

}

arch_initcall(service_level_perf_register);



/* See also arch/s390/kernel/traps.c */

static unsigned long __store_trace(struct perf_callchain_entry *entry,

				   unsigned long sp,