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coresight: etm4x: adding configurable address range filtering

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This patch adds the capability to specify address ranges from
the perf cmd line using the --filter option.  If the IP
falls within the range(s) program flow traces are generated.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2016-08-25 15:19:17 -06:00 committed by Greg Kroah-Hartman
parent f0d30cc30e
commit 2703d74c13
1 changed files with 119 additions and 9 deletions
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128
drivers/hwtracing/coresight/coresight-etm4x.c
View File

@ -45,7 +45,9 @@ module_param_named(boot_enable, boot_enable, int, S_IRUGO);
/* The number of ETMv4 currently registered */
static int etm4_count;
static struct etmv4_drvdata *etmdrvdata[NR_CPUS];
static void etm4_set_default(struct etmv4_config *config);
static void etm4_set_default_config(struct etmv4_config *config);
static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
struct perf_event *event);
static enum cpuhp_state hp_online;
@ -187,11 +189,14 @@ static void etm4_enable_hw(void *info)
static int etm4_parse_event_config(struct etmv4_drvdata *drvdata,
struct perf_event *event)
{
int ret = 0;
struct etmv4_config *config = &drvdata->config;
struct perf_event_attr *attr = &event->attr;
if (!attr)
return -EINVAL;
if (!attr) {
ret = -EINVAL;
goto out;
}
/* Clear configuration from previous run */
memset(config, 0, sizeof(struct etmv4_config));
@ -203,7 +208,12 @@ static int etm4_parse_event_config(struct etmv4_drvdata *drvdata,
config->mode = ETM_MODE_EXCL_USER;
/* Always start from the default config */
etm4_set_default(config);
etm4_set_default_config(config);
/* Configure filters specified on the perf cmd line, if any. */
ret = etm4_set_event_filters(drvdata, event);
if (ret)
goto out;
/* Go from generic option to ETMv4 specifics */
if (attr->config & BIT(ETM_OPT_CYCACC))
@ -211,23 +221,30 @@ static int etm4_parse_event_config(struct etmv4_drvdata *drvdata,
if (attr->config & BIT(ETM_OPT_TS))
config->cfg |= ETMv4_MODE_TIMESTAMP;
return 0;
out:
return ret;
}
static int etm4_enable_perf(struct coresight_device *csdev,
struct perf_event *event)
{
int ret = 0;
struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id()))
return -EINVAL;
if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) {
ret = -EINVAL;
goto out;
}
/* Configure the tracer based on the session's specifics */
etm4_parse_event_config(drvdata, event);
ret = etm4_parse_event_config(drvdata, event);
if (ret)
goto out;
/* And enable it */
etm4_enable_hw(drvdata);
return 0;
out:
return ret;
}
static int etm4_enable_sysfs(struct coresight_device *csdev)
@ -682,6 +699,99 @@ static void etm4_set_default(struct etmv4_config *config)
etm4_set_default_filter(config);
}
static int etm4_get_next_comparator(struct etmv4_drvdata *drvdata, u32 type)
{
int nr_comparator, index = 0;
struct etmv4_config *config = &drvdata->config;
/*
* nr_addr_cmp holds the number of comparator _pair_, so time 2
* for the total number of comparators.
*/
nr_comparator = drvdata->nr_addr_cmp * 2;
/* Go through the tally of comparators looking for a free one. */
while (index < nr_comparator) {
switch (type) {
case ETM_ADDR_TYPE_RANGE:
if (config->addr_type[index] == ETM_ADDR_TYPE_NONE &&
config->addr_type[index + 1] == ETM_ADDR_TYPE_NONE)
return index;
/* Address range comparators go in pairs */
index += 2;
break;
default:
return -EINVAL;
}
}
/* If we are here all the comparators have been used. */
return -ENOSPC;
}
static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
struct perf_event *event)
{
int i, comparator, ret = 0;
struct etmv4_config *config = &drvdata->config;
struct etm_filters *filters = event->hw.addr_filters;
if (!filters)
goto default_filter;
/* Sync events with what Perf got */
perf_event_addr_filters_sync(event);
/*
* If there are no filters to deal with simply go ahead with
* the default filter, i.e the entire address range.
*/
if (!filters->nr_filters)
goto default_filter;
for (i = 0; i < filters->nr_filters; i++) {
struct etm_filter *filter = &filters->etm_filter[i];
enum etm_addr_type type = filter->type;
/* See if a comparator is free. */
comparator = etm4_get_next_comparator(drvdata, type);
if (comparator < 0) {
ret = comparator;
goto out;
}
switch (type) {
case ETM_ADDR_TYPE_RANGE:
etm4_set_comparator_filter(config,
filter->start_addr,
filter->stop_addr,
comparator);
/*
* TRCVICTLR::SSSTATUS == 1, the start-stop logic is
* in the started state
*/
config->vinst_ctrl |= BIT(9);
/* No start-stop filtering for ViewInst */
config->vissctlr = 0x0;
break;
default:
ret = -EINVAL;
goto out;
}
}
goto out;
default_filter:
etm4_set_default_filter(config);
out:
return ret;
}
void etm4_config_trace_mode(struct etmv4_config *config)
{
u32 addr_acc, mode;