src/devtools/met_drv_v2/common/cpu_dsu.c - T800 - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2019 MediaTek Inc.
  */

 #include <linux/perf_event.h>
 #include "met_drv.h"
 #include "met_kernel_symbol.h"
 #include "interface.h"
 #include "trace.h"
 #include "cpu_dsu.h"
 #include "core_plf_init.h"


 struct cpu_dsu_hw *cpu_dsu;
 static int counter_cnt;
 static struct kobject *kobj_dsu;
 static int nr_arg;
 static unsigned long long perfCurr[MXNR_DSU_EVENTS];
 static unsigned long long perfPrev[MXNR_DSU_EVENTS];
 static int perfCntFirst[MXNR_DSU_EVENTS];
 static struct perf_event * pevent[MXNR_DSU_EVENTS];
 static struct perf_event_attr pevent_attr[MXNR_DSU_EVENTS];
 static unsigned int perf_device_type = 7;
 static ssize_t perf_type_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
 {
 	return snprintf(buf, PAGE_SIZE, "%d\n", perf_device_type);
 }

 static ssize_t perf_type_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t n)
 {
 	if (kstrtouint(buf, 0, &perf_device_type) != 0)
 		return -EINVAL;

 	return n;
 }
 static struct kobj_attribute perf_type_attr = __ATTR(perf_type, 0664, perf_type_show, perf_type_store);

 noinline void mp_dsu(unsigned char cnt, unsigned int *value)
 {
 	MET_GENERAL_PRINT(MET_TRACE, cnt, value);
 }

 static void dummy_handler(struct perf_event *event, struct perf_sample_data *data,
 			  struct pt_regs *regs)
 {
 	/*
 	 * Required as perf_event_create_kernel_counter() requires an overflow handler,
 	 * even though all we do is poll.
 	 */
 }

 static void perf_cpudsu_polling(unsigned long long stamp, int cpu)
 {
 	int	event_count = cpu_dsu->event_count;
 	struct met_dsu	*pmu = cpu_dsu->pmu;
 	int	i, count;
 	unsigned long long	delta;
 	struct perf_event	*ev;
 	unsigned int pmu_value[MXNR_DSU_EVENTS];
 	u64 value;
 	int ret;

 	count = 0;
 	for (i = 0; i < event_count; i++) {
 		if (pmu[i].mode == 0)
 			continue;

 		ev = pevent[i];
 		if ((ev != NULL) && (ev->state == PERF_EVENT_STATE_ACTIVE)) {
 			if (!met_export_api_symbol->met_perf_event_read_local)
 				continue;

 			ret = met_export_api_symbol->met_perf_event_read_local(ev, &value);
 			if (ret < 0) {
 				PR_BOOTMSG_ONCE("[MET_DSU] perf_event_read_local fail (ret=%d)\n", ret);
 				pr_debug("[MET_DSU] perf_event_read_local fail (ret=%d)\n", ret);
 				continue;
 			}

 			perfCurr[i] = value;
 			delta = (perfCurr[i] - perfPrev[i]);
 			perfPrev[i] = perfCurr[i];
 			if (perfCntFirst[i] == 1) {
 				/* we shall omit delta counter when we get first counter */
 				perfCntFirst[i] = 0;
 				continue;
 			}
 			pmu_value[count] = (unsigned int)delta;
 			count++;
 		}
 	}

 	if (count == counter_cnt)
 		mp_dsu(count, pmu_value);
 }

 static int perf_thread_set_perf_events(unsigned int cpu)
 {
 	int			i, size;
 	struct perf_event	*ev;
 	struct perf_event_attr	*ev_attr;
 	int event_count = cpu_dsu->event_count;
 	struct met_dsu *pmu = cpu_dsu->pmu;

 	size = sizeof(struct perf_event_attr);

 	for (i = 0; i < event_count; i++) {
 		pevent[i] = NULL;
 		if (!pmu[i].mode)
 			continue;	/* Skip disabled counters */
 		perfPrev[i] = 0;
 		perfCurr[i] = 0;
 		ev_attr = pevent_attr+i;
 		memset(ev_attr, 0, size);
 		ev_attr->config = pmu[i].event;
 		ev_attr->type = perf_device_type;
 		ev_attr->size = size;
 		ev_attr->sample_period = 0;
 		ev_attr->pinned = 1;

 		ev = perf_event_create_kernel_counter(ev_attr, cpu, NULL, dummy_handler, NULL);
 		if (IS_ERR(ev))
 			continue;
 		if (ev->state != PERF_EVENT_STATE_ACTIVE) {
 			perf_event_release_kernel(ev);
 			continue;
 		}
 		pevent[i] = ev;
 		if (ev != NULL)
 			perf_event_enable(ev);

 		perfCntFirst[i] = 1;
 	}	/* for all PMU counter */
 	return 0;
 }

 void met_perf_cpudsu_down(void)
 {
 	int i;
 	struct perf_event *ev;
 	int event_count;
 	struct met_dsu *pmu;

 	if (met_cpudsu.mode == 0)
 		return;
 	event_count = cpu_dsu->event_count;
 	pmu = cpu_dsu->pmu;
 	for (i = 0; i < event_count; i++) {
 		if (!pmu[i].mode)
 			continue;
 		ev = pevent[i];
 		if ((ev != NULL) && (ev->state == PERF_EVENT_STATE_ACTIVE)) {
 			perf_event_disable(ev);
 			perf_event_release_kernel(ev);
 		}
 		pevent[i] = NULL;
 	}
 	//perf_delayed_work_setup = NULL;
 }

 inline static void met_perf_cpudsu_start(int cpu)
 {
 	if (met_cpudsu.mode == 0)
 		return;
 	if (cpu != 0)
 		return;
 	perf_thread_set_perf_events(cpu);
 }

 static int cpudsu_create_subfs(struct kobject *parent)
 {
 	int ret = 0;
 	cpu_dsu = cpu_dsu_hw_init();
 	if (cpu_dsu == NULL) {
 		PR_BOOTMSG("Failed to init CPU PMU HW!!\n");
 		return -ENODEV;
 	}
 	kobj_dsu = parent;
 	ret = sysfs_create_file(kobj_dsu, &perf_type_attr.attr);
 	if (ret != 0) {
 		PR_BOOTMSG("Failed to create perf_type in sysfs\n");
 		goto out;
 	}
  out:
 	return ret;
 }

 static void cpudsu_delete_subfs(void)
 {
 }

 void met_perf_cpudsu_polling(unsigned long long stamp, int cpu)
 {
 	perf_cpudsu_polling(stamp, cpu);
 }

 static void cpudsu_start(void)
 {
 	int	cpu = raw_smp_processor_id();
 	for_each_online_cpu(cpu)
 		met_perf_cpudsu_start(cpu);
 }

 static void cpudsu_stop(void)
 {
 	met_perf_cpudsu_down();
 }

 static const char header[] =
 	"met-info [000] 0.0: met_dsu_pmu_header: DSU";

 static const char help[] =
 	"  --dsu=EVENT         select DSU-PMU events.\n"
 	"                      you can enable at most \"%d general purpose events\"\n";

 static int cpudsu_print_help(char *buf, int len)
 {
 	return snprintf(buf, PAGE_SIZE, help, cpu_dsu->event_count);
 }

 static int reset_driver_stat(void)
 {
 	int		i;
 	int		event_count;
 	struct met_dsu	*pmu;

 	met_cpudsu.mode = 0;
 	event_count = cpu_dsu->event_count;
 	pmu = cpu_dsu->pmu;
 	counter_cnt = 0;
 	nr_arg = 0;
 	for (i = 0; i < event_count; i++) {
 		pmu[i].mode = MODE_DISABLED;
 		pmu[i].event = 0;
 		pmu[i].freq = 0;
 	}
 	return 0;
 }

 static int cpudsu_print_header(char *buf, int len)
 {
 	int		first;
 	int		i, ret;
 	int		event_count;
 	struct met_dsu	*pmu;
 	ret = 0;

 	ret += snprintf(buf + ret, PAGE_SIZE - ret, "# mp_dsu: pmu_value1, ...\n");
 	event_count = cpu_dsu->event_count;
 	pmu = cpu_dsu->pmu;
 	first = 1;
 	for (i = 0; i < event_count; i++) {
 		if (pmu[i].mode == 0)
 			continue;
 		if (first) {
 			ret += snprintf(buf + ret, PAGE_SIZE - ret, header);
 			first = 0;
 		}
 		ret += snprintf(buf + ret, PAGE_SIZE - ret, ",0x%x", pmu[i].event);
 		pmu[i].mode = 0;
 	}
 	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
 	reset_driver_stat();
 	return ret;
 }

 static int met_parse_num_list(char *arg, int len, int *list, int list_cnt)
 {
 	int	nr_num = 0;
 	char	*num;
 	int	num_len;

 	/* search ',' as the splitter */
 	while (len) {
 		num = arg;
 		num_len = 0;
 		if (list_cnt <= 0)
 			return -1;
 		while (len) {
 			len--;
 			if (*arg == ',') {
 				*(arg++) = '\0';
 				break;
 			}
 			arg++;
 			num_len++;
 		}
 		if (met_parse_num(num, list, num_len) < 0)
 			return -1;
 		list++;
 		list_cnt--;
 		nr_num++;
 	}
 	return nr_num;
 }

 static int cpudsu_process_argument(const char *arg, int len)
 {
 	int		nr_events, event_list[MXNR_DSU_EVENTS]={0};
 	int		i;
 	int		nr_counters;
 	struct met_dsu	*pmu;
 	int		arg_nr;
 	int		counters;
 	int		event_no;

 	/* get event_list */
 	if ((nr_events = met_parse_num_list((char*)arg, len, event_list, ARRAY_SIZE(event_list))) <= 0)
 		goto arg_out;

 	/* for each cpu in cpu_list, add all the events in event_list */
 	nr_counters = cpu_dsu->event_count;
 	pmu = cpu_dsu->pmu;
 	arg_nr = nr_arg;

 	/*
 	 * setup nr_counters for linux native perf mode.
 	 * because the selected events are stored in pmu,
 	 * so nr_counters can't large then event count in pmu.
 	 */
 	counters = perf_num_counters();
 	if (counters < nr_counters)
 		nr_counters = counters;

 	if (nr_counters == 0)
 		goto arg_out;

 	for (i = 0; i < nr_events; i++) {
 		event_no = event_list[i];
 		/*
 		 * check if event is duplicate,
 		 * but may not include 0xff when met_cpu_dsu_method == 0.
 		 */
 		if (cpu_dsu->check_event(pmu, arg_nr, event_no) < 0)
 			goto arg_out;
 		if (arg_nr >= nr_counters)
 			goto arg_out;
 		pmu[arg_nr].mode = MODE_POLLING;
 		pmu[arg_nr].event = event_no;
 		pmu[arg_nr].freq = 0;
 		arg_nr++;
 		counter_cnt++;
 	}
 	nr_arg = arg_nr;
 	met_cpudsu.mode = 1;
 	return 0;

 arg_out:
 	reset_driver_stat();
 	return -EINVAL;
 }

 struct metdevice met_cpudsu = {
 	.name = "dsu",
 	.type = MET_TYPE_PMU,
 	.cpu_related = 0,
 	.create_subfs = cpudsu_create_subfs,
 	.delete_subfs = cpudsu_delete_subfs,
 	.start = cpudsu_start,
 	.stop = cpudsu_stop,
 	.polling_interval = 1,
 	.timed_polling = met_perf_cpudsu_polling,
 	.print_help = cpudsu_print_help,
 	.print_header = cpudsu_print_header,
 	.process_argument = cpudsu_process_argument
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2019 MediaTek Inc.
	*/

	#include <linux/perf_event.h>
	#include "met_drv.h"
	#include "met_kernel_symbol.h"
	#include "interface.h"
	#include "trace.h"
	#include "cpu_dsu.h"
	#include "core_plf_init.h"


	struct cpu_dsu_hw *cpu_dsu;
	static int counter_cnt;
	static struct kobject *kobj_dsu;
	static int nr_arg;
	static unsigned long long perfCurr[MXNR_DSU_EVENTS];
	static unsigned long long perfPrev[MXNR_DSU_EVENTS];
	static int perfCntFirst[MXNR_DSU_EVENTS];
	static struct perf_event * pevent[MXNR_DSU_EVENTS];
	static struct perf_event_attr pevent_attr[MXNR_DSU_EVENTS];
	static unsigned int perf_device_type = 7;
	static ssize_t perf_type_show(struct kobject kobj, struct kobj_attribute attr, char *buf)
	{
	return snprintf(buf, PAGE_SIZE, "%d\n", perf_device_type);
	}

	static ssize_t perf_type_store(struct kobject kobj, struct kobj_attribute attr, const char *buf, size_t n)
	{
	if (kstrtouint(buf, 0, &perf_device_type) != 0)
	return -EINVAL;

	return n;
	}
	static struct kobj_attribute perf_type_attr = __ATTR(perf_type, 0664, perf_type_show, perf_type_store);

	noinline void mp_dsu(unsigned char cnt, unsigned int *value)
	{
	MET_GENERAL_PRINT(MET_TRACE, cnt, value);
	}

	static void dummy_handler(struct perf_event event, struct perf_sample_data data,
	struct pt_regs *regs)
	{
	/*
	* Required as perf_event_create_kernel_counter() requires an overflow handler,
	* even though all we do is poll.
	*/
	}

	static void perf_cpudsu_polling(unsigned long long stamp, int cpu)
	{
	int event_count = cpu_dsu->event_count;
	struct met_dsu *pmu = cpu_dsu->pmu;
	int i, count;
	unsigned long long delta;
	struct perf_event *ev;
	unsigned int pmu_value[MXNR_DSU_EVENTS];
	u64 value;
	int ret;

	count = 0;
	for (i = 0; i < event_count; i++) {
	if (pmu[i].mode == 0)
	continue;

	ev = pevent[i];
	if ((ev != NULL) && (ev->state == PERF_EVENT_STATE_ACTIVE)) {
	if (!met_export_api_symbol->met_perf_event_read_local)
	continue;

	ret = met_export_api_symbol->met_perf_event_read_local(ev, &value);
	if (ret < 0) {
	PR_BOOTMSG_ONCE("[MET_DSU] perf_event_read_local fail (ret=%d)\n", ret);
	pr_debug("[MET_DSU] perf_event_read_local fail (ret=%d)\n", ret);
	continue;
	}

	perfCurr[i] = value;
	delta = (perfCurr[i] - perfPrev[i]);
	perfPrev[i] = perfCurr[i];
	if (perfCntFirst[i] == 1) {
	/* we shall omit delta counter when we get first counter */
	perfCntFirst[i] = 0;
	continue;
	}
	pmu_value[count] = (unsigned int)delta;
	count++;
	}
	}

	if (count == counter_cnt)
	mp_dsu(count, pmu_value);
	}

	static int perf_thread_set_perf_events(unsigned int cpu)
	{
	int i, size;
	struct perf_event *ev;
	struct perf_event_attr *ev_attr;
	int event_count = cpu_dsu->event_count;
	struct met_dsu *pmu = cpu_dsu->pmu;

	size = sizeof(struct perf_event_attr);

	for (i = 0; i < event_count; i++) {
	pevent[i] = NULL;
	if (!pmu[i].mode)
	continue; /* Skip disabled counters */
	perfPrev[i] = 0;
	perfCurr[i] = 0;
	ev_attr = pevent_attr+i;
	memset(ev_attr, 0, size);
	ev_attr->config = pmu[i].event;
	ev_attr->type = perf_device_type;
	ev_attr->size = size;
	ev_attr->sample_period = 0;
	ev_attr->pinned = 1;

	ev = perf_event_create_kernel_counter(ev_attr, cpu, NULL, dummy_handler, NULL);
	if (IS_ERR(ev))
	continue;
	if (ev->state != PERF_EVENT_STATE_ACTIVE) {
	perf_event_release_kernel(ev);
	continue;
	}
	pevent[i] = ev;
	if (ev != NULL)
	perf_event_enable(ev);

	perfCntFirst[i] = 1;
	} /* for all PMU counter */
	return 0;
	}

	void met_perf_cpudsu_down(void)
	{
	int i;
	struct perf_event *ev;
	int event_count;
	struct met_dsu *pmu;

	if (met_cpudsu.mode == 0)
	return;
	event_count = cpu_dsu->event_count;
	pmu = cpu_dsu->pmu;
	for (i = 0; i < event_count; i++) {
	if (!pmu[i].mode)
	continue;
	ev = pevent[i];
	if ((ev != NULL) && (ev->state == PERF_EVENT_STATE_ACTIVE)) {
	perf_event_disable(ev);
	perf_event_release_kernel(ev);
	}
	pevent[i] = NULL;
	}
	//perf_delayed_work_setup = NULL;
	}

	inline static void met_perf_cpudsu_start(int cpu)
	{
	if (met_cpudsu.mode == 0)
	return;
	if (cpu != 0)
	return;
	perf_thread_set_perf_events(cpu);
	}

	static int cpudsu_create_subfs(struct kobject *parent)
	{
	int ret = 0;
	cpu_dsu = cpu_dsu_hw_init();
	if (cpu_dsu == NULL) {
	PR_BOOTMSG("Failed to init CPU PMU HW!!\n");
	return -ENODEV;
	}
	kobj_dsu = parent;
	ret = sysfs_create_file(kobj_dsu, &perf_type_attr.attr);
	if (ret != 0) {
	PR_BOOTMSG("Failed to create perf_type in sysfs\n");
	goto out;
	}
	out:
	return ret;
	}

	static void cpudsu_delete_subfs(void)
	{
	}

	void met_perf_cpudsu_polling(unsigned long long stamp, int cpu)
	{
	perf_cpudsu_polling(stamp, cpu);
	}

	static void cpudsu_start(void)
	{
	int cpu = raw_smp_processor_id();
	for_each_online_cpu(cpu)
	met_perf_cpudsu_start(cpu);
	}

	static void cpudsu_stop(void)
	{
	met_perf_cpudsu_down();
	}

	static const char header[] =
	"met-info [000] 0.0: met_dsu_pmu_header: DSU";

	static const char help[] =
	" --dsu=EVENT select DSU-PMU events.\n"
	" you can enable at most \"%d general purpose events\"\n";

	static int cpudsu_print_help(char *buf, int len)
	{
	return snprintf(buf, PAGE_SIZE, help, cpu_dsu->event_count);
	}

	static int reset_driver_stat(void)
	{
	int i;
	int event_count;
	struct met_dsu *pmu;

	met_cpudsu.mode = 0;
	event_count = cpu_dsu->event_count;
	pmu = cpu_dsu->pmu;
	counter_cnt = 0;
	nr_arg = 0;
	for (i = 0; i < event_count; i++) {
	pmu[i].mode = MODE_DISABLED;
	pmu[i].event = 0;
	pmu[i].freq = 0;
	}
	return 0;
	}

	static int cpudsu_print_header(char *buf, int len)
	{
	int first;
	int i, ret;
	int event_count;
	struct met_dsu *pmu;
	ret = 0;

	ret += snprintf(buf + ret, PAGE_SIZE - ret, "# mp_dsu: pmu_value1, ...\n");
	event_count = cpu_dsu->event_count;
	pmu = cpu_dsu->pmu;
	first = 1;
	for (i = 0; i < event_count; i++) {
	if (pmu[i].mode == 0)
	continue;
	if (first) {
	ret += snprintf(buf + ret, PAGE_SIZE - ret, header);
	first = 0;
	}
	ret += snprintf(buf + ret, PAGE_SIZE - ret, ",0x%x", pmu[i].event);
	pmu[i].mode = 0;
	}
	ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
	reset_driver_stat();
	return ret;
	}

	static int met_parse_num_list(char arg, int len, int list, int list_cnt)
	{
	int nr_num = 0;
	char *num;
	int num_len;

	/* search ',' as the splitter */
	while (len) {
	num = arg;
	num_len = 0;
	if (list_cnt <= 0)
	return -1;
	while (len) {
	len--;
	if (*arg == ',') {
	*(arg++) = '\0';
	break;
	}
	arg++;
	num_len++;
	}
	if (met_parse_num(num, list, num_len) < 0)
	return -1;
	list++;
	list_cnt--;
	nr_num++;
	}
	return nr_num;
	}

	static int cpudsu_process_argument(const char *arg, int len)
	{
	int nr_events, event_list[MXNR_DSU_EVENTS]={0};
	int i;
	int nr_counters;
	struct met_dsu *pmu;
	int arg_nr;
	int counters;
	int event_no;

	/* get event_list */
	if ((nr_events = met_parse_num_list((char*)arg, len, event_list, ARRAY_SIZE(event_list))) <= 0)
	goto arg_out;

	/* for each cpu in cpu_list, add all the events in event_list */
	nr_counters = cpu_dsu->event_count;
	pmu = cpu_dsu->pmu;
	arg_nr = nr_arg;

	/*
	* setup nr_counters for linux native perf mode.
	* because the selected events are stored in pmu,
	* so nr_counters can't large then event count in pmu.
	*/
	counters = perf_num_counters();
	if (counters < nr_counters)
	nr_counters = counters;

	if (nr_counters == 0)
	goto arg_out;

	for (i = 0; i < nr_events; i++) {
	event_no = event_list[i];
	/*
	* check if event is duplicate,
	* but may not include 0xff when met_cpu_dsu_method == 0.
	*/
	if (cpu_dsu->check_event(pmu, arg_nr, event_no) < 0)
	goto arg_out;
	if (arg_nr >= nr_counters)
	goto arg_out;
	pmu[arg_nr].mode = MODE_POLLING;
	pmu[arg_nr].event = event_no;
	pmu[arg_nr].freq = 0;
	arg_nr++;
	counter_cnt++;
	}
	nr_arg = arg_nr;
	met_cpudsu.mode = 1;
	return 0;

	arg_out:
	reset_driver_stat();
	return -EINVAL;
	}

	struct metdevice met_cpudsu = {
	.name = "dsu",
	.type = MET_TYPE_PMU,
	.cpu_related = 0,
	.create_subfs = cpudsu_create_subfs,
	.delete_subfs = cpudsu_delete_subfs,
	.start = cpudsu_start,
	.stop = cpudsu_stop,
	.polling_interval = 1,
	.timed_polling = met_perf_cpudsu_polling,
	.print_help = cpudsu_print_help,
	.print_header = cpudsu_print_header,
	.process_argument = cpudsu_process_argument
	};