coresight: etm4x: adding configurable address range filtering
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>hifive-unleashed-5.1
Mathieu Poirier
Greg Kroah-Hartman
parent
f0d30cc30e
commit
2703d74c13
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@ -45,7 +45,9 @@ module_param_named(boot_enable, boot_enable, int, S_IRUGO);
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/* The number of ETMv4 currently registered */
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static int etm4_count;
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static struct etmv4_drvdata *etmdrvdata[NR_CPUS];
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static void etm4_set_default(struct etmv4_config *config);
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static void etm4_set_default_config(struct etmv4_config *config);
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static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
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struct perf_event *event);
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static enum cpuhp_state hp_online;
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@ -187,11 +189,14 @@ static void etm4_enable_hw(void *info)
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static int etm4_parse_event_config(struct etmv4_drvdata *drvdata,
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struct perf_event *event)
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{
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int ret = 0;
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struct etmv4_config *config = &drvdata->config;
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struct perf_event_attr *attr = &event->attr;
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if (!attr)
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return -EINVAL;
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if (!attr) {
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ret = -EINVAL;
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goto out;
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}
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/* Clear configuration from previous run */
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memset(config, 0, sizeof(struct etmv4_config));
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@ -203,7 +208,12 @@ static int etm4_parse_event_config(struct etmv4_drvdata *drvdata,
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config->mode = ETM_MODE_EXCL_USER;
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/* Always start from the default config */
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etm4_set_default(config);
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etm4_set_default_config(config);
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/* Configure filters specified on the perf cmd line, if any. */
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ret = etm4_set_event_filters(drvdata, event);
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if (ret)
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goto out;
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/* Go from generic option to ETMv4 specifics */
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if (attr->config & BIT(ETM_OPT_CYCACC))
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@ -211,23 +221,30 @@ static int etm4_parse_event_config(struct etmv4_drvdata *drvdata,
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if (attr->config & BIT(ETM_OPT_TS))
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config->cfg |= ETMv4_MODE_TIMESTAMP;
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return 0;
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out:
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return ret;
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}
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static int etm4_enable_perf(struct coresight_device *csdev,
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struct perf_event *event)
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{
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int ret = 0;
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struct etmv4_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id()))
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return -EINVAL;
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if (WARN_ON_ONCE(drvdata->cpu != smp_processor_id())) {
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ret = -EINVAL;
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goto out;
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}
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/* Configure the tracer based on the session's specifics */
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etm4_parse_event_config(drvdata, event);
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ret = etm4_parse_event_config(drvdata, event);
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if (ret)
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goto out;
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/* And enable it */
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etm4_enable_hw(drvdata);
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return 0;
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out:
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return ret;
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}
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static int etm4_enable_sysfs(struct coresight_device *csdev)
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@ -682,6 +699,99 @@ static void etm4_set_default(struct etmv4_config *config)
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etm4_set_default_filter(config);
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}
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static int etm4_get_next_comparator(struct etmv4_drvdata *drvdata, u32 type)
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{
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int nr_comparator, index = 0;
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struct etmv4_config *config = &drvdata->config;
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/*
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* nr_addr_cmp holds the number of comparator _pair_, so time 2
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* for the total number of comparators.
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*/
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nr_comparator = drvdata->nr_addr_cmp * 2;
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/* Go through the tally of comparators looking for a free one. */
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while (index < nr_comparator) {
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switch (type) {
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case ETM_ADDR_TYPE_RANGE:
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if (config->addr_type[index] == ETM_ADDR_TYPE_NONE &&
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config->addr_type[index + 1] == ETM_ADDR_TYPE_NONE)
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return index;
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/* Address range comparators go in pairs */
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index += 2;
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break;
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default:
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return -EINVAL;
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}
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}
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/* If we are here all the comparators have been used. */
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return -ENOSPC;
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}
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static int etm4_set_event_filters(struct etmv4_drvdata *drvdata,
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struct perf_event *event)
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{
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int i, comparator, ret = 0;
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struct etmv4_config *config = &drvdata->config;
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struct etm_filters *filters = event->hw.addr_filters;
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if (!filters)
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goto default_filter;
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/* Sync events with what Perf got */
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perf_event_addr_filters_sync(event);
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/*
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* If there are no filters to deal with simply go ahead with
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* the default filter, i.e the entire address range.
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*/
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if (!filters->nr_filters)
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goto default_filter;
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for (i = 0; i < filters->nr_filters; i++) {
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struct etm_filter *filter = &filters->etm_filter[i];
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enum etm_addr_type type = filter->type;
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/* See if a comparator is free. */
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comparator = etm4_get_next_comparator(drvdata, type);
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if (comparator < 0) {
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ret = comparator;
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goto out;
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}
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switch (type) {
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case ETM_ADDR_TYPE_RANGE:
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etm4_set_comparator_filter(config,
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filter->start_addr,
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filter->stop_addr,
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comparator);
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/*
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* TRCVICTLR::SSSTATUS == 1, the start-stop logic is
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* in the started state
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*/
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config->vinst_ctrl |= BIT(9);
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/* No start-stop filtering for ViewInst */
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config->vissctlr = 0x0;
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break;
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default:
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ret = -EINVAL;
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goto out;
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}
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}
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goto out;
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default_filter:
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etm4_set_default_filter(config);
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out:
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return ret;
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}
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void etm4_config_trace_mode(struct etmv4_config *config)
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{
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u32 addr_acc, mode;
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