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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright(C) 2015 Linaro Limited. All rights reserved.
* Author: Mathieu Poirier <mathieu.poirier@linaro.org>
*/
#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/percpu-defs.h>
#include <linux/slab.h>
#include <linux/stringhash.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;
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(contextid, "config:" __stringify(ETM_OPT_CTXTID));
PMU_FORMAT_ATTR(timestamp, "config:" __stringify(ETM_OPT_TS));
PMU_FORMAT_ATTR(retstack, "config:" __stringify(ETM_OPT_RETSTK));
/* Sink ID - same for all ETMs */
PMU_FORMAT_ATTR(sinkid, "config2:0-31");
static struct attribute *etm_config_formats_attr[] = {
&format_attr_cycacc.attr,
&format_attr_contextid.attr,
&format_attr_timestamp.attr,
&format_attr_retstack.attr,
&format_attr_sinkid.attr,
NULL,
};
static const struct attribute_group etm_pmu_format_group = {
.name = "format",
.attrs = etm_config_formats_attr,
};
static struct attribute *etm_config_sinks_attr[] = {
NULL,
};
static const struct attribute_group etm_pmu_sinks_group = {
.name = "sinks",
.attrs = etm_config_sinks_attr,
};
static const struct attribute_group *etm_pmu_attr_groups[] = {
&etm_pmu_format_group,
&etm_pmu_sinks_group,
NULL,
};
static inline struct list_head **
etm_event_cpu_path_ptr(struct etm_event_data *data, int cpu)
{
return per_cpu_ptr(data->path, cpu);
}
static inline struct list_head *
etm_event_cpu_path(struct etm_event_data *data, int cpu)
{
return *etm_event_cpu_path_ptr(data, cpu);
}
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_sink_buffer(struct etm_event_data *event_data)
{
int cpu;
cpumask_t *mask = &event_data->mask;
struct coresight_device *sink;
if (WARN_ON(cpumask_empty(mask)))
return;
if (!event_data->snk_config)
return;
cpu = cpumask_first(mask);
sink = coresight_get_sink(etm_event_cpu_path(event_data, cpu));
sink_ops(sink)->free_buffer(event_data->snk_config);
}
static void free_event_data(struct work_struct *work)
{
int cpu;
cpumask_t *mask;
struct etm_event_data *event_data;
event_data = container_of(work, struct etm_event_data, work);
mask = &event_data->mask;
/* Free the sink buffers, if there are any */
free_sink_buffer(event_data);
for_each_cpu(cpu, mask) {
struct list_head **ppath;
ppath = etm_event_cpu_path_ptr(event_data, cpu);
if (!(IS_ERR_OR_NULL(*ppath)))
coresight_release_path(*ppath);
*ppath = NULL;
}
free_percpu(event_data->path);
kfree(event_data);
}
static void *alloc_event_data(int cpu)
{
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;
mask = &event_data->mask;
if (cpu != -1)
cpumask_set_cpu(cpu, mask);
else
cpumask_copy(mask, cpu_present_mask);
/*
* 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 = alloc_percpu(struct list_head *);
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(struct perf_event *event, void **pages,
int nr_pages, bool overwrite)
{
u32 id;
int cpu = event->cpu;
cpumask_t *mask;
struct coresight_device *sink;
struct etm_event_data *event_data = NULL;
event_data = alloc_event_data(cpu);
if (!event_data)
return NULL;
INIT_WORK(&event_data->work, free_event_data);
/* First get the selected sink from user space. */
if (event->attr.config2) {
id = (u32)event->attr.config2;
sink = coresight_get_sink_by_id(id);
} else {
sink = coresight_get_enabled_sink(true);
}
if (!sink)
goto err;
mask = &event_data->mask;
/*
* Setup the path for each CPU in a trace session. We try to build
* trace path for each CPU in the mask. If we don't find an ETM
* for the CPU or fail to build a path, we clear the CPU from the
* mask and continue with the rest. If ever we try to trace on those
* CPUs, we can handle it and fail the session.
*/
for_each_cpu(cpu, mask) {
struct list_head *path;
struct coresight_device *csdev;
csdev = per_
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