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coresight: etm-perf: configuring filters from perf core 

This patch implements the required API needed to access
and retrieve range and start/stop filters from the perf core.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
steinar/wifi_calib_4_9_kernel
Mathieu Poirier 2016-08-25 15:19:12 -06:00 committed by Greg Kroah-Hartman
parent 2b7adc460f
commit ca878b1466
2 changed files with 167 additions and 14 deletions
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147
drivers/hwtracing/coresight/coresight-etm-perf.c
View File

@ -27,6 +27,7 @@
#include <linux/types.h>
#include <linux/workqueue.h>
#include "coresight-etm-perf.h"
#include "coresight-priv.h"
static struct pmu etm_pmu;
@ -71,14 +72,48 @@ static const struct attribute_group *etm_pmu_attr_groups[] = {
static void etm_event_read(struct perf_event *event) {}
static int etm_event_init(struct perf_event *event)
static int etm_addr_filters_alloc(struct perf_event *event)
{
if (event->attr.type != etm_pmu.type)
return -ENOENT;
struct etm_filters *filters;
int node = event->cpu == -1 ? -1 : cpu_to_node(event->cpu);
filters = kzalloc_node(sizeof(struct etm_filters), GFP_KERNEL, node);
if (!filters)
return -ENOMEM;
if (event->parent)
memcpy(filters, event->parent->hw.addr_filters,
sizeof(*filters));
event->hw.addr_filters = filters;
return 0;
}
static void etm_event_destroy(struct perf_event *event)
{
kfree(event->hw.addr_filters);
event->hw.addr_filters = NULL;
}
static int etm_event_init(struct perf_event *event)
{
int ret = 0;
if (event->attr.type != etm_pmu.type) {
ret = -ENOENT;
goto out;
}
ret = etm_addr_filters_alloc(event);
if (ret)
goto out;
event->destroy = etm_event_destroy;
out:
return ret;
}
static void free_event_data(struct work_struct *work)
{
int cpu;
@ -342,6 +377,87 @@ static void etm_event_del(struct perf_event *event, int mode)
etm_event_stop(event, PERF_EF_UPDATE);
}
static int etm_addr_filters_validate(struct list_head *filters)
{
bool range = false, address = false;
int index = 0;
struct perf_addr_filter *filter;
list_for_each_entry(filter, filters, entry) {
/*
* No need to go further if there's no more
* room for filters.
*/
if (++index > ETM_ADDR_CMP_MAX)
return -EOPNOTSUPP;
/*
* As taken from the struct perf_addr_filter documentation:
* @range: 1: range, 0: address
*
* At this time we don't allow range and start/stop filtering
* to cohabitate, they have to be mutually exclusive.
*/
if ((filter->range == 1) && address)
return -EOPNOTSUPP;
if ((filter->range == 0) && range)
return -EOPNOTSUPP;
/*
* For range filtering, the second address in the address
* range comparator needs to be higher than the first.
* Invalid otherwise.
*/
if (filter->range && filter->size == 0)
return -EINVAL;
/*
* Everything checks out with this filter, record what we've
* received before moving on to the next one.
*/
if (filter->range)
range = true;
else
address = true;
}
return 0;
}
static void etm_addr_filters_sync(struct perf_event *event)
{
struct perf_addr_filters_head *head = perf_event_addr_filters(event);
unsigned long start, stop, *offs = event->addr_filters_offs;
struct etm_filters *filters = event->hw.addr_filters;
struct etm_filter *etm_filter;
struct perf_addr_filter *filter;
int i = 0;
list_for_each_entry(filter, &head->list, entry) {
start = filter->offset + offs[i];
stop = start + filter->size;
etm_filter = &filters->etm_filter[i];
if (filter->range == 1) {
etm_filter->start_addr = start;
etm_filter->stop_addr = stop;
etm_filter->type = ETM_ADDR_TYPE_RANGE;
} else {
if (filter->filter == 1) {
etm_filter->start_addr = start;
etm_filter->type = ETM_ADDR_TYPE_START;
} else {
etm_filter->stop_addr = stop;
etm_filter->type = ETM_ADDR_TYPE_STOP;
}
}
i++;
}
filters->nr_filters = i;
}
int etm_perf_symlink(struct coresight_device *csdev, bool link)
{
char entry[sizeof("cpu9999999")];
@ -371,18 +487,21 @@ static int __init etm_perf_init(void)
{
int ret;
etm_pmu.capabilities = PERF_PMU_CAP_EXCLUSIVE;
etm_pmu.capabilities = PERF_PMU_CAP_EXCLUSIVE;
etm_pmu.attr_groups = etm_pmu_attr_groups;
etm_pmu.task_ctx_nr = perf_sw_context;
etm_pmu.read = etm_event_read;
etm_pmu.event_init = etm_event_init;
etm_pmu.setup_aux = etm_setup_aux;
etm_pmu.free_aux = etm_free_aux;
etm_pmu.start = etm_event_start;
etm_pmu.stop = etm_event_stop;
etm_pmu.add = etm_event_add;
etm_pmu.del = etm_event_del;
etm_pmu.attr_groups = etm_pmu_attr_groups;
etm_pmu.task_ctx_nr = perf_sw_context;
etm_pmu.read = etm_event_read;
etm_pmu.event_init = etm_event_init;
etm_pmu.setup_aux = etm_setup_aux;
etm_pmu.free_aux = etm_free_aux;
etm_pmu.start = etm_event_start;
etm_pmu.stop = etm_event_stop;
etm_pmu.add = etm_event_add;
etm_pmu.del = etm_event_del;
etm_pmu.addr_filters_sync = etm_addr_filters_sync;
etm_pmu.addr_filters_validate = etm_addr_filters_validate;
etm_pmu.nr_addr_filters = ETM_ADDR_CMP_MAX;
ret = perf_pmu_register(&etm_pmu, CORESIGHT_ETM_PMU_NAME, -1);
if (ret == 0)

34
drivers/hwtracing/coresight/coresight-etm-perf.h
View File

@ -18,8 +18,42 @@
#ifndef _CORESIGHT_ETM_PERF_H
#define _CORESIGHT_ETM_PERF_H
#include "coresight-priv.h"
struct coresight_device;
/*
* In both ETMv3 and v4 the maximum number of address comparator implentable
* is 8. The actual number is implementation specific and will be checked
* when filters are applied.
*/
#define ETM_ADDR_CMP_MAX 8
/**
* struct etm_filter - single instruction range or start/stop configuration.
* @start_addr: The address to start tracing on.
* @stop_addr: The address to stop tracing on.
* @type: Is this a range or start/stop filter.
*/
struct etm_filter {
unsigned long start_addr;
unsigned long stop_addr;
enum etm_addr_type type;
};
/**
* struct etm_filters - set of filters for a session
* @etm_filter: All the filters for this session.
* @nr_filters: Number of filters
* @ssstatus: Status of the start/stop logic.
*/
struct etm_filters {
struct etm_filter etm_filter[ETM_ADDR_CMP_MAX];
unsigned int nr_filters;
bool ssstatus;
};
#ifdef CONFIG_CORESIGHT
int etm_perf_symlink(struct coresight_device *csdev, bool link);