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/*
* Copyright(C) 2015 Linaro Limited. All rights reserved.
* Author: Mathieu Poirier <mathieu.poirier@linaro.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/coresight.h>
#include <linux/coresight-pmu.h>
#include <linux/cpumask.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/perf_event.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include "coresight-etm-perf.h"
#include "coresight-priv.h"
static struct pmu etm_pmu;
static bool etm_perf_up;
/**
* struct etm_event_data - Coresight specifics associated to an event
* @work: Handle to free allocated memory outside IRQ context.
* @mask: Hold the CPU(s) this event was set for.
* @snk_config: The sink configuration.
* @path: An array of path, each slot for one CPU.
*/
struct etm_event_data {
struct work_struct work;
cpumask_t mask;
void *snk_config;
struct list_head **path;
};
static DEFINE_PER_CPU(struct perf_output_handle, ctx_handle);
static DEFINE_PER_CPU(struct coresight_device *, csdev_src);
/* ETMv3.5/PTM's ETMCR is 'config' */
PMU_FORMAT_ATTR(cycacc, "config:" __stringify(ETM_OPT_CYCACC));
PMU_FORMAT_ATTR(timestamp, "config:" __stringify(ETM_OPT_TS));
static struct attribute *etm_config_formats_attr[] = {
&format_attr_cycacc.attr,
&format_attr_timestamp.attr,
NULL,
};
static struct attribute_group etm_pmu_format_group = {
.name = "format",
.attrs = etm_config_formats_attr,
};
static const struct attribute_group *etm_pmu_attr_groups[] = {
&etm_pmu_format_group,
NULL,
};
static void etm_event_read(struct perf_event *event) {}
static int etm_addr_filters_alloc(struct perf_event *event)
{
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;
cpumask_t *mask;
struct etm_event_data *event_data;
struct coresight_device *sink;
event_data = container_of(work, struct etm_event_data, work);
mask = &event_data->mask;
/*
* First deal with the sink configuration. See comment in
* etm_setup_aux() about why we take the first available path.
*/
if (event_data->snk_config) {
cpu = cpumask_first(mask);
sink = coresight_get_sink(event_data->path[cpu]);
if (sink_ops(sink)->free_buffer)
sink_ops(sink)->free_buffer(event_data->snk_config);
}
for_each_cpu(cpu, mask) {
if (!(IS_ERR_OR_NULL(event_data->path[cpu])))
coresight_release_path(event_data->path[cpu]);
}
kfree(event_data->path);
kfree(event_data);
}
static void *alloc_event_data(int cpu)
{
int size;
cpumask_t *mask;
struct etm_event_data *event_data;
/* First get memory for the session's data */
event_data = kzalloc(sizeof(struct etm_event_data), GFP_KERNEL);
if (!event_data)
return NULL;
/* Make sure nothing disappears under us */
get_online_cpus();
size = num_online_cpus();
mask = &event_data->mask;
if (cpu != -1)
cpumask_set_cpu(cpu, mask);
else
cpumask_copy(mask, cpu_online_mask);
put_online_cpus();
/*
* Each CPU has a single path between source and destination. As such
* allocate an array using CPU numbers as indexes. That way a path
* for any CPU can easily be accessed at any given time. We proceed
* the same way for sessions involving a single CPU. The cost of
* unused memory when dealing with single CPU trace scenarios is small
* compared to the cost of searching through an optimized array.
*/
event_data->path = kcalloc(size,
sizeof(struct list_head *), GFP_KERNEL);
if (!event_data->path) {
kfree(event_data);
return NULL;
}
return event_data;
}
static void etm_free_aux(void *data)
{
struct etm_event_data *event_data = data;
schedule_work(&event_data->work);
}
static void *etm_setup_aux(int event_cpu, void **pages,
int nr_pages, bool overwrite)
{
int cpu;
cpumask_t *mask;
struct coresight_device *sink;
struct etm_event_data *event_data = NULL;
event_data = alloc_event_data(event_cpu);
if (!event_data)
return NULL;
INIT_WORK(&event_data->work, free_event_data);
/*
* In theory nothing prevent tracers in a trace session from being
* associated with different sinks, nor having a sink per tracer. But
* until we have HW with this kind of topology we need to assume tracers
* in a trace session are using the same sink. Therefore go through
* the coresight bus and pick the first enabled sink.
*
* When operated from sysFS users are responsible to enable the sink
* while from perf, the perf tools will do it based on the choice made
* on the cmd line. As such the "enable_sink" flag in sysFS is reset.
*/
sink = coresight_get_enabled_sink(true);
if (!sink)
goto err;
mask = &event_data->mask;
/* Setup the path for each CPU in a trace session */
for_each_cpu(cpu, mask) {
struct coresight_device *csdev;
csdev = per_cpu(csdev_src, cpu);
if (!csdev)
goto err;
/*
* Building a path doesn't enable it, it simply builds a
* list of devices from source to sink that can be
* referenced later when the path is actually needed.
*/
event_data->path[cpu] = coresight_build_path(csdev, sink);
if (IS_ERR(event_data->path[cpu]))
goto err;
}
if (!sink_ops(sink)->alloc_buffer)
goto err;
cpu = cpumask_first(mask);
/* Get the AUX specific data from the sink buffer */
event_data->snk_config =
sink_ops(sink)->alloc_buffer(sink, cpu, pages,
nr_pages, overwrite);
if (!event_data->snk_config)
goto err;
out:
return event_data;
err:
etm_free_aux(event_data);
event_data = NULL;
goto out;
}
static void etm_event_start(struct perf_event *event, int flags)
{
int cpu = smp_processor_id();
struct etm_event_data *event_data;
struct perf_output_handle *handle = this_cpu_ptr(&ctx_handle);
struct coresight_device *sink, *csdev = per_cpu(csdev_src, cpu);
if (!csdev)
goto fail;
/*
* Deal with the ring buffer API and get a handle on the
* session's information.
*/
event_data = perf_aux_output_begin(handle, event);
if (!event_data)
goto fail;
/* We need a sink, no need to continue without one */
sink = coresight_get_sink(event_data->path[cpu]);
if (WARN_ON_ONCE(!sink || !sink_ops(sink)->set_buffer))
goto fail_end_stop;
/* Configure the sink */
|