[systemtap.git] / tapset-perfmon.cxx

// tapset for HW performance monitoring
// Copyright (C) 2005-2014 Red Hat Inc.
// Copyright (C) 2005-2007 Intel Corporation.
//
// This file is part of systemtap, and is free software.  You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.

#include "session.h"
#include "tapsets.h"
#include "task_finder.h"
#include "translate.h"
#include "util.h"

#include <string>

extern "C" {
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
}

using namespace std;
using namespace __gnu_cxx;


static const string TOK_PERF("perf");
static const string TOK_TYPE("type");
static const string TOK_CONFIG("config");
static const string TOK_SAMPLE("sample");
static const string TOK_PROCESS("process");
static const string TOK_COUNTER("counter");


// ------------------------------------------------------------------------
// perf event derived probes
// ------------------------------------------------------------------------
// This is a new interface to the perfmon hw.
//

struct perf_derived_probe: public derived_probe
{
  int64_t event_type;
  int64_t event_config;
  int64_t interval;
  bool has_process;
  bool has_counter;
  string process_name;
  string counter;
  perf_derived_probe (probe* p, probe_point* l, int64_t type, int64_t config,
		      int64_t i, bool pp, bool cp, string pn, string cv);
  virtual void join_group (systemtap_session& s);
};


struct perf_derived_probe_group: public generic_dpg<perf_derived_probe>
{
  void emit_module_decls (systemtap_session& s);
  void emit_module_init (systemtap_session& s);
  void emit_module_exit (systemtap_session& s);
};


perf_derived_probe::perf_derived_probe (probe* p, probe_point* l,
                                        int64_t type,
                                        int64_t config,
                                        int64_t i,
					bool process_p,
					bool counter_p,
					string process_n,
					string counter):
  
  derived_probe (p, l, true /* .components soon rewritten */),
  event_type (type), event_config (config), interval (i),
  has_process (process_p), has_counter (counter_p), process_name (process_n),
  counter (counter)
{
  vector<probe_point::component*>& comps = this->sole_location()->components;
  comps.clear();
  comps.push_back (new probe_point::component (TOK_PERF));
  comps.push_back (new probe_point::component (TOK_TYPE, new literal_number(type)));
  comps.push_back (new probe_point::component (TOK_CONFIG, new literal_number (config)));
  comps.push_back (new probe_point::component (TOK_SAMPLE, new literal_number (interval)));
  if (has_process)
    comps.push_back (new probe_point::component (TOK_PROCESS, new literal_string (process_name)));
  if (has_counter)
    comps.push_back (new probe_point::component (TOK_COUNTER, new literal_string (counter)));
}


void
perf_derived_probe::join_group (systemtap_session& s)
{
  if (! s.perf_derived_probes)
    s.perf_derived_probes = new perf_derived_probe_group ();
  s.perf_derived_probes->enroll (this);

  if (has_process && !has_counter)
    enable_task_finder(s);
}


void
perf_derived_probe_group::emit_module_decls (systemtap_session& s)
{
  bool have_a_process_tag = false;

  for (unsigned i=0; i < probes.size(); i++)
    if (probes[i]->has_process && !probes[i]->has_counter)
      {
	have_a_process_tag = true;
	break;
      }

  if (probes.empty()) return;

  s.op->newline() << "/* ---- perf probes ---- */";
  s.op->newline() << "#include <linux/perf_event.h>";
  s.op->newline() << "#include \"linux/perf.h\"";
  s.op->newline();

  /* declarations */
  s.op->newline() << "static void handle_perf_probe (unsigned i, struct pt_regs *regs);";
  for (unsigned i=0; i < probes.size(); i++)
    {
      s.op->newline() << "#ifdef STAPCONF_PERF_HANDLER_NMI";
      s.op->newline() << "static void enter_perf_probe_" << i
                      << " (struct perf_event *e, int nmi, "
                      << "struct perf_sample_data *data, "
                      << "struct pt_regs *regs);";
      s.op->newline() << "#else";
      s.op->newline() << "static void enter_perf_probe_" << i
                      << " (struct perf_event *e, "
                      << "struct perf_sample_data *data, "
                      << "struct pt_regs *regs);";
      s.op->newline() << "#endif";
    }
  s.op->newline();

  // Output task finder callback routine
  if (have_a_process_tag)
    {
      s.op->newline() << "static int _stp_perf_probe_cb(struct stap_task_finder_target *tgt, struct task_struct *tsk, int register_p, int process_p) {";
      s.op->indent(1);
      s.op->newline() << "int rc = 0;";
      s.op->newline() << "struct stap_perf_probe *p = container_of(tgt, struct stap_perf_probe, e.t.tgt);";
      
      s.op->newline() << "if (register_p) ";
      s.op->indent(1);
      
      s.op->newline() << "rc = _stp_perf_init(p, tsk);";
      s.op->newline(-1) << "else";
      s.op->newline(1) << "_stp_perf_del(p);";
      s.op->newline(-1) << "return rc;";
      s.op->newline(-1) << "}";
    }

  /* data structures */
  s.op->newline() << "static struct stap_perf_probe stap_perf_probes ["
                  << probes.size() << "] = {";
  s.op->indent(1);
  for (unsigned i=0; i < probes.size(); i++)
    {
      s.op->newline() << "{";
      s.op->newline(1) << ".attr={ "
                       << ".type=" << probes[i]->event_type << "ULL, "
                       << ".config=" << probes[i]->event_config << "ULL, "
                       << "{ .sample_period=" << probes[i]->interval << "ULL }},";
      s.op->newline() << ".callback=enter_perf_probe_" << i << ", ";
      s.op->newline() << ".probe=" << common_probe_init (probes[i]) << ", ";

      if (probes[i]->has_process && !probes[i]->has_counter)
	{
	  s.op->line() << " .e={";
	  s.op->line() << " .t={";
	  s.op->line() << " .tgt={";
	  s.op->line() << " .purpose=\"perfctr\",";
	  s.op->line() << " .procname=\"" << probes[i]->process_name << "\",";
	  s.op->line() << " .pid=0,";
	  s.op->line() << " .callback=&_stp_perf_probe_cb,";
	  s.op->line() << " },";
	  s.op->line() << " },";
	  s.op->line() << " },";
	  s.op->newline() << ".task_finder=" << "1, ";
	}
      else if (probes[i]->has_counter)
	{
	  // process counters are currently task-found by uprobes
	  // set neither .system_wide nor .task_finder
	}
      else
	s.op->newline() << ".system_wide=" << "1, ";
      s.op->newline(-1) << "},";
    }
  s.op->newline(-1) << "};";
  s.op->newline();

  /* wrapper functions */
  for (unsigned i=0; i < probes.size(); i++)
    {
      s.op->newline() << "#ifdef STAPCONF_PERF_HANDLER_NMI";
      s.op->newline() << "static void enter_perf_probe_" << i
                      << " (struct perf_event *e, int nmi, "
                      << "struct perf_sample_data *data, "
                      << "struct pt_regs *regs)";
      s.op->newline() << "#else";
      s.op->newline() << "static void enter_perf_probe_" << i
                      << " (struct perf_event *e, "
                      << "struct perf_sample_data *data, "
                      << "struct pt_regs *regs)";
      s.op->newline() << "#endif";
      s.op->newline() << "{";
      s.op->newline(1) << "handle_perf_probe(" << i << ", regs);";
      s.op->newline(-1) << "}";
    }
  s.op->newline();

  s.op->newline() << "static void handle_perf_probe (unsigned i, struct pt_regs *regs)";
  s.op->newline() << "{";
  s.op->newline(1) << "struct stap_perf_probe* stp = & stap_perf_probes [i];";
  common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "stp->probe",
				 "stp_probe_type_perf");
  s.op->newline() << "if (user_mode(regs)) {";
  s.op->newline(1)<< "c->user_mode_p = 1;";
  s.op->newline() << "c->uregs = regs;";
  s.op->newline(-1) << "} else {";
  s.op->newline(1) << "c->kregs = regs;";
  s.op->newline(-1) << "}";

  s.op->newline() << "(*stp->probe->ph) (c);";
  common_probe_entryfn_epilogue (s, true);
  s.op->newline(-1) << "}";
  s.op->newline();
  if (have_a_process_tag)
    s.op->newline() << "#define STP_PERF_USE_TASK_FINDER 1";
  s.op->newline() << "#include \"linux/perf.c\"";
  s.op->newline();
}


void
perf_derived_probe_group::emit_module_init (systemtap_session& s)
{
  if (probes.empty()) return;

  s.op->newline() << "rc = _stp_perf_init_n (stap_perf_probes, "
		  << probes.size() << ", &probe_point);";
}


void
perf_derived_probe_group::emit_module_exit (systemtap_session& s)
{
  if (probes.empty()) return;

  s.op->newline() << "_stp_perf_del_n (stap_perf_probes, "
		  << probes.size() << ");";
}


struct perf_builder: public derived_probe_builder
{
    virtual void build(systemtap_session & sess,
                       probe * base, probe_point * location,
                       literal_map_t const & parameters,
                       vector<derived_probe *> & finished_results);

    static void register_patterns(systemtap_session& s);
};


void
perf_builder::build(systemtap_session & sess,
		    probe * base,
		    probe_point * location,
		    literal_map_t const & parameters,
		    vector<derived_probe *> & finished_results)
{
  // XXX need additional version checks too?
  // --- perhaps look for export of perf_event_create_kernel_counter
  if (sess.kernel_exports.find("perf_event_create_kernel_counter") == sess.kernel_exports.end())
    throw SEMANTIC_ERROR (_("perf probes not available without exported perf_event_create_kernel_counter"));
  if (sess.kernel_config["CONFIG_PERF_EVENTS"] != "y")
    throw SEMANTIC_ERROR (_("perf probes not available without CONFIG_PERF_EVENTS"));

  int64_t type;
  bool has_type = get_param(parameters, TOK_TYPE, type);
  assert(has_type);

  int64_t config;
  bool has_config = get_param(parameters, TOK_CONFIG, config);
  assert(has_config);

  int64_t period;
  bool has_period = get_param(parameters, TOK_SAMPLE, period);
  if (!has_period)
    period = 1000000; // XXX: better parametrize this default
  else if (period < 1)
    throw SEMANTIC_ERROR(_("invalid perf sample period ") + lex_cast(period),
                         parameters.find(TOK_SAMPLE)->second->tok);

  string var;
  bool has_counter = get_param(parameters, TOK_COUNTER, var);
  if (var.find_first_of("*?[") != string::npos)
    throw SEMANTIC_ERROR(_("wildcard not allowed with perf probe counter component"));
  if (has_counter)
    {
      if (var.empty())
	throw SEMANTIC_ERROR(_("missing perf probe counter component name"));

      period = 0;		// perf_event_attr.sample_freq should be 0
      if (sess.perf_counters.count(var) > 0)
	throw SEMANTIC_ERROR(_("duplicate counter name"));

      // Splice a 'next' into the probe body, and then elaborate.cxx's
      // dead_stmtexpr_remover() will warn if anything of substance follows.
      statement* n = new next_statement ();
      n->tok = base->tok;
      base->body = new block (n, base->body);
    }

  bool proc_p;
  string proc_n;
  if ((proc_p = has_null_param(parameters, TOK_PROCESS)))
    {
      proc_n = sess.cmd_file();
      if (proc_n.empty())
	throw SEMANTIC_ERROR(_("process probe is invalid without a -c COMMAND"));
    }
  else
    proc_p = get_param(parameters, TOK_PROCESS, proc_n);
  if (proc_p && !proc_n.empty())
    proc_n = find_executable (proc_n, sess.sysroot, sess.sysenv);

  if (sess.verbose > 1)
    clog << _F("perf probe type=%" PRId64 " config=%" PRId64 " period=%" PRId64 " process=%s counter=%s",
	       type, config, period, proc_n.c_str(), var.c_str()) << endl;

  finished_results.push_back
    (new perf_derived_probe(base, location, type, config, period, proc_p,
			    has_counter, proc_n, var));
  if (!var.empty())
    sess.perf_counters[var] = make_pair(proc_n,finished_results.back());
}


void
register_tapset_perf(systemtap_session& s)
{
  // NB: at this point, the binding is *not* unprivileged.

  derived_probe_builder *builder = new perf_builder();
  match_node* perf = s.pattern_root->bind(TOK_PERF);

  match_node* event = perf->bind_num(TOK_TYPE)->bind_num(TOK_CONFIG);
  event->bind(builder);
  event->bind_num(TOK_SAMPLE)->bind(builder);
  event->bind_str(TOK_PROCESS)->bind(builder);
  event->bind(TOK_PROCESS)->bind(builder);
  event->bind_str(TOK_COUNTER)->bind(builder);
  event->bind_str(TOK_PROCESS)->bind_str(TOK_COUNTER)->bind(builder);
}

/* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */
Commit	Line	Data
01c2eefe	1	// tapset for HW performance monitoring
ef36f781	2	// Copyright (C) 2005-2014 Red Hat Inc.
01c2eefe	3	// Copyright (C) 2005-2007 Intel Corporation.
01c2eefe JS	4	//
	5	// This file is part of systemtap, and is free software. You can
	6	// redistribute it and/or modify it under the terms of the GNU General
	7	// Public License (GPL); either version 2, or (at your option) any
	8	// later version.
	9
	10	#include "session.h"
	11	#include "tapsets.h"
6a8fe809	12	#include "task_finder.h"
83ea76b1	13	#include "translate.h"
01c2eefe JS	14	#include "util.h"
	15
	16	#include <string>
	17
b29e794d LB	18	extern "C" {
	19	#define __STDC_FORMAT_MACROS
	20	#include <inttypes.h>
	21	}
	22
01c2eefe JS	23	using namespace std;
	24	using namespace __gnu_cxx;
	25
	26
83ea76b1	27	static const string TOK_PERF("perf");
95ef3b30 FCE	28	static const string TOK_TYPE("type");
95ef3b30 FCE	29	static const string TOK_CONFIG("config");
a3cf75e6	30	static const string TOK_SAMPLE("sample");
6a8fe809	31	static const string TOK_PROCESS("process");
3689db05	32	static const string TOK_COUNTER("counter");
83ea76b1	33
01c2eefe JS	34
01c2eefe JS	35	// ------------------------------------------------------------------------
83ea76b1	36	// perf event derived probes
01c2eefe JS	37	// ------------------------------------------------------------------------
	38	// This is a new interface to the perfmon hw.
	39	//
	40
83ea76b1 WC	41	struct perf_derived_probe: public derived_probe
83ea76b1 WC	42	{
95ef3b30 FCE	43	int64_t event_type;
95ef3b30 FCE	44	int64_t event_config;
83ea76b1	45	int64_t interval;
6a8fe809	46	bool has_process;
3689db05	47	bool has_counter;
6a8fe809	48	string process_name;
3689db05 SC	49	string counter;
	50	perf_derived_probe (probe* p, probe_point* l, int64_t type, int64_t config,
	51	int64_t i, bool pp, bool cp, string pn, string cv);
83ea76b1 WC	52	virtual void join_group (systemtap_session& s);
	53	};
	54
	55
	56	struct perf_derived_probe_group: public generic_dpg<perf_derived_probe>
	57	{
83ea76b1 WC	58	void emit_module_decls (systemtap_session& s);
	59	void emit_module_init (systemtap_session& s);
	60	void emit_module_exit (systemtap_session& s);
	61	};
	62
	63
	64	perf_derived_probe::perf_derived_probe (probe* p, probe_point* l,
95ef3b30 FCE	65	int64_t type,
95ef3b30 FCE	66	int64_t config,
6a8fe809 SC	67	int64_t i,
6a8fe809 SC	68	bool process_p,
3689db05 SC	69	bool counter_p,
	70	string process_n,
	71	string counter):
6a8fe809	72
4c5d1300	73	derived_probe (p, l, true /* .components soon rewritten */),
6a8fe809	74	event_type (type), event_config (config), interval (i),
3689db05 SC	75	has_process (process_p), has_counter (counter_p), process_name (process_n),
3689db05 SC	76	counter (counter)
83ea76b1	77	{
a3cf75e6 JS	78	vector<probe_point::component*>& comps = this->sole_location()->components;
	79	comps.clear();
	80	comps.push_back (new probe_point::component (TOK_PERF));
95ef3b30 FCE	81	comps.push_back (new probe_point::component (TOK_TYPE, new literal_number(type)));
95ef3b30 FCE	82	comps.push_back (new probe_point::component (TOK_CONFIG, new literal_number (config)));
a3cf75e6	83	comps.push_back (new probe_point::component (TOK_SAMPLE, new literal_number (interval)));
8a1bdec5 JS	84	if (has_process)
	85	comps.push_back (new probe_point::component (TOK_PROCESS, new literal_string (process_name)));
	86	if (has_counter)
	87	comps.push_back (new probe_point::component (TOK_COUNTER, new literal_string (counter)));
83ea76b1 WC	88	}
	89
	90
	91	void
	92	perf_derived_probe::join_group (systemtap_session& s)
	93	{
	94	if (! s.perf_derived_probes)
	95	s.perf_derived_probes = new perf_derived_probe_group ();
	96	s.perf_derived_probes->enroll (this);
6a8fe809	97
3689db05 SC	98	if (has_process && !has_counter)
3689db05 SC	99	enable_task_finder(s);
83ea76b1 WC	100	}
	101
	102
83ea76b1 WC	103	void
	104	perf_derived_probe_group::emit_module_decls (systemtap_session& s)
	105	{
3689db05 SC	106	bool have_a_process_tag = false;
	107
	108	for (unsigned i=0; i < probes.size(); i++)
	109	if (probes[i]->has_process && !probes[i]->has_counter)
	110	{
	111	have_a_process_tag = true;
	112	break;
	113	}
	114
83ea76b1 WC	115	if (probes.empty()) return;
	116
	117	s.op->newline() << "/* ---- perf probes ---- */";
6a8fe809 SC	118	s.op->newline() << "#include <linux/perf_event.h>";
6a8fe809 SC	119	s.op->newline() << "#include \"linux/perf.h\"";
85955320 JS	120	s.op->newline();
85955320 JS	121
83ea76b1	122	/* declarations */
06d2888c	123	s.op->newline() << "static void handle_perf_probe (unsigned i, struct pt_regs *regs);";
85955320	124	for (unsigned i=0; i < probes.size(); i++)
2f3df331 MW	125	{
	126	s.op->newline() << "#ifdef STAPCONF_PERF_HANDLER_NMI";
	127	s.op->newline() << "static void enter_perf_probe_" << i
	128	<< " (struct perf_event *e, int nmi, "
	129	<< "struct perf_sample_data *data, "
	130	<< "struct pt_regs *regs);";
	131	s.op->newline() << "#else";
	132	s.op->newline() << "static void enter_perf_probe_" << i
	133	<< " (struct perf_event *e, "
	134	<< "struct perf_sample_data *data, "
	135	<< "struct pt_regs *regs);";
	136	s.op->newline() << "#endif";
	137	}
85955320 JS	138	s.op->newline();
85955320 JS	139
3689db05 SC	140	// Output task finder callback routine
	141	if (have_a_process_tag)
	142	{
	143	s.op->newline() << "static int _stp_perf_probe_cb(struct stap_task_finder_target tgt, struct task_struct tsk, int register_p, int process_p) {";
	144	s.op->indent(1);
	145	s.op->newline() << "int rc = 0;";
4fa83377	146	s.op->newline() << "struct stap_perf_probe *p = container_of(tgt, struct stap_perf_probe, e.t.tgt);";
3689db05 SC	147
	148	s.op->newline() << "if (register_p) ";
	149	s.op->indent(1);
	150
	151	s.op->newline() << "rc = _stp_perf_init(p, tsk);";
	152	s.op->newline(-1) << "else";
	153	s.op->newline(1) << "_stp_perf_del(p);";
	154	s.op->newline(-1) << "return rc;";
	155	s.op->newline(-1) << "}";
	156	}
6a8fe809	157
85955320	158	/* data structures */
34fe8ec4 JS	159	s.op->newline() << "static struct stap_perf_probe stap_perf_probes ["
34fe8ec4 JS	160	<< probes.size() << "] = {";
85955320	161	s.op->indent(1);
83ea76b1 WC	162	for (unsigned i=0; i < probes.size(); i++)
83ea76b1 WC	163	{
85955320 JS	164	s.op->newline() << "{";
85955320 JS	165	s.op->newline(1) << ".attr={ "
95ef3b30 FCE	166	<< ".type=" << probes[i]->event_type << "ULL, "
95ef3b30 FCE	167	<< ".config=" << probes[i]->event_config << "ULL, "
85955320	168	<< "{ .sample_period=" << probes[i]->interval << "ULL }},";
34fe8ec4	169	s.op->newline() << ".callback=enter_perf_probe_" << i << ", ";
faea5e16	170	s.op->newline() << ".probe=" << common_probe_init (probes[i]) << ", ";
6a8fe809	171
3689db05	172	if (probes[i]->has_process && !probes[i]->has_counter)
6a8fe809	173	{
4fa83377 SC	174	s.op->line() << " .e={";
4fa83377 SC	175	s.op->line() << " .t={";
6a8fe809	176	s.op->line() << " .tgt={";
3689db05	177	s.op->line() << " .purpose=\"perfctr\",";
48cd804a	178	s.op->line() << " .procname=\"" << probes[i]->process_name << "\",";
6a8fe809 SC	179	s.op->line() << " .pid=0,";
	180	s.op->line() << " .callback=&_stp_perf_probe_cb,";
	181	s.op->line() << " },";
4fa83377 SC	182	s.op->line() << " },";
4fa83377 SC	183	s.op->line() << " },";
ad6c8f90	184	s.op->newline() << ".task_finder=" << "1, ";
6a8fe809	185	}
3689db05	186	else if (probes[i]->has_counter)
ad6c8f90 JS	187	{
	188	// process counters are currently task-found by uprobes
	189	// set neither .system_wide nor .task_finder
	190	}
6a8fe809	191	else
ad6c8f90	192	s.op->newline() << ".system_wide=" << "1, ";
85955320	193	s.op->newline(-1) << "},";
83ea76b1	194	}
85955320	195	s.op->newline(-1) << "};";
83ea76b1 WC	196	s.op->newline();
	197
	198	/* wrapper functions */
85955320 JS	199	for (unsigned i=0; i < probes.size(); i++)
85955320 JS	200	{
2f3df331	201	s.op->newline() << "#ifdef STAPCONF_PERF_HANDLER_NMI";
85955320 JS	202	s.op->newline() << "static void enter_perf_probe_" << i
	203	<< " (struct perf_event *e, int nmi, "
	204	<< "struct perf_sample_data *data, "
	205	<< "struct pt_regs *regs)";
2f3df331 MW	206	s.op->newline() << "#else";
	207	s.op->newline() << "static void enter_perf_probe_" << i
	208	<< " (struct perf_event *e, "
	209	<< "struct perf_sample_data *data, "
	210	<< "struct pt_regs *regs)";
	211	s.op->newline() << "#endif";
85955320	212	s.op->newline() << "{";
06d2888c	213	s.op->newline(1) << "handle_perf_probe(" << i << ", regs);";
85955320 JS	214	s.op->newline(-1) << "}";
	215	}
	216	s.op->newline();
	217
06d2888c	218	s.op->newline() << "static void handle_perf_probe (unsigned i, struct pt_regs *regs)";
83ea76b1	219	s.op->newline() << "{";
06d2888c	220	s.op->newline(1) << "struct stap_perf_probe* stp = & stap_perf_probes [i];";
71db462b	221	common_probe_entryfn_prologue (s, "STAP_SESSION_RUNNING", "stp->probe",
cda141c2	222	"stp_probe_type_perf");
d9aed31e	223	s.op->newline() << "if (user_mode(regs)) {";
e04b5d74	224	s.op->newline(1)<< "c->user_mode_p = 1;";
d9aed31e MW	225	s.op->newline() << "c->uregs = regs;";
	226	s.op->newline(-1) << "} else {";
	227	s.op->newline(1) << "c->kregs = regs;";
	228	s.op->newline(-1) << "}";
d3f9f732	229
d9aed31e	230	s.op->newline() << "(*stp->probe->ph) (c);";
f887a8c9	231	common_probe_entryfn_epilogue (s, true);
83ea76b1	232	s.op->newline(-1) << "}";
6a8fe809	233	s.op->newline();
ad6c8f90 JS	234	if (have_a_process_tag)
ad6c8f90 JS	235	s.op->newline() << "#define STP_PERF_USE_TASK_FINDER 1";
6a8fe809 SC	236	s.op->newline() << "#include \"linux/perf.c\"";
6a8fe809 SC	237	s.op->newline();
83ea76b1 WC	238	}
	239
	240
	241	void
	242	perf_derived_probe_group::emit_module_init (systemtap_session& s)
	243	{
	244	if (probes.empty()) return;
	245
ad6c8f90 JS	246	s.op->newline() << "rc = _stp_perf_init_n (stap_perf_probes, "
ad6c8f90 JS	247	<< probes.size() << ", &probe_point);";
83ea76b1 WC	248	}
	249
	250
	251	void
	252	perf_derived_probe_group::emit_module_exit (systemtap_session& s)
	253	{
	254	if (probes.empty()) return;
	255
ad6c8f90 JS	256	s.op->newline() << "_stp_perf_del_n (stap_perf_probes, "
ad6c8f90 JS	257	<< probes.size() << ");";
83ea76b1 WC	258	}
	259
	260
	261	struct perf_builder: public derived_probe_builder
	262	{
	263	virtual void build(systemtap_session & sess,
	264	probe * base, probe_point * location,
	265	literal_map_t const & parameters,
	266	vector<derived_probe *> & finished_results);
	267
	268	static void register_patterns(systemtap_session& s);
	269	};
	270
	271
	272	void
	273	perf_builder::build(systemtap_session & sess,
3689db05 SC	274	probe * base,
	275	probe_point * location,
	276	literal_map_t const & parameters,
	277	vector<derived_probe *> & finished_results)
83ea76b1	278	{
7acbe856 FCE	279	// XXX need additional version checks too?
7acbe856 FCE	280	// --- perhaps look for export of perf_event_create_kernel_counter
70e6d6c9	281	if (sess.kernel_exports.find("perf_event_create_kernel_counter") == sess.kernel_exports.end())
dc09353a	282	throw SEMANTIC_ERROR (_("perf probes not available without exported perf_event_create_kernel_counter"));
7acbe856	283	if (sess.kernel_config["CONFIG_PERF_EVENTS"] != "y")
dc09353a	284	throw SEMANTIC_ERROR (_("perf probes not available without CONFIG_PERF_EVENTS"));
7acbe856	285
95ef3b30 FCE	286	int64_t type;
	287	bool has_type = get_param(parameters, TOK_TYPE, type);
	288	assert(has_type);
	289
	290	int64_t config;
	291	bool has_config = get_param(parameters, TOK_CONFIG, config);
	292	assert(has_config);
a3cf75e6	293
83ea76b1	294	int64_t period;
a3cf75e6 JS	295	bool has_period = get_param(parameters, TOK_SAMPLE, period);
a3cf75e6 JS	296	if (!has_period)
95ef3b30	297	period = 1000000; // XXX: better parametrize this default
1f1b6bb1	298	else if (period < 1)
dc09353a	299	throw SEMANTIC_ERROR(_("invalid perf sample period ") + lex_cast(period),
1f1b6bb1	300	parameters.find(TOK_SAMPLE)->second->tok);
3689db05 SC	301
	302	string var;
	303	bool has_counter = get_param(parameters, TOK_COUNTER, var);
	304	if (var.find_first_of("*?[") != string::npos)
dc09353a	305	throw SEMANTIC_ERROR(_("wildcard not allowed with perf probe counter component"));
3689db05 SC	306	if (has_counter)
3689db05 SC	307	{
7c3feb93	308	if (var.empty())
dc09353a	309	throw SEMANTIC_ERROR(_("missing perf probe counter component name"));
7c3feb93	310
3689db05	311	period = 0; // perf_event_attr.sample_freq should be 0
7c3feb93 JS	312	if (sess.perf_counters.count(var) > 0)
	313	throw SEMANTIC_ERROR(_("duplicate counter name"));
	314
	315	// Splice a 'next' into the probe body, and then elaborate.cxx's
	316	// dead_stmtexpr_remover() will warn if anything of substance follows.
	317	statement* n = new next_statement ();
	318	n->tok = base->tok;
	319	base->body = new block (n, base->body);
3689db05	320	}
1f1b6bb1	321
48cd804a JS	322	bool proc_p;
	323	string proc_n;
	324	if ((proc_p = has_null_param(parameters, TOK_PROCESS)))
	325	{
	326	proc_n = sess.cmd_file();
	327	if (proc_n.empty())
	328	throw SEMANTIC_ERROR(_("process probe is invalid without a -c COMMAND"));
	329	}
	330	else
	331	proc_p = get_param(parameters, TOK_PROCESS, proc_n);
	332	if (proc_p && !proc_n.empty())
	333	proc_n = find_executable (proc_n, sess.sysroot, sess.sysenv);
	334
1f1b6bb1	335	if (sess.verbose > 1)
48cd804a JS	336	clog << _F("perf probe type=%" PRId64 " config=%" PRId64 " period=%" PRId64 " process=%s counter=%s",
48cd804a JS	337	type, config, period, proc_n.c_str(), var.c_str()) << endl;
a3cf75e6	338
83ea76b1	339	finished_results.push_back
3689db05 SC	340	(new perf_derived_probe(base, location, type, config, period, proc_p,
3689db05 SC	341	has_counter, proc_n, var));
48cd804a JS	342	if (!var.empty())
48cd804a JS	343	sess.perf_counters[var] = make_pair(proc_n,finished_results.back());
1f1b6bb1 JS	344	}
	345
	346
83ea76b1 WC	347	void
	348	register_tapset_perf(systemtap_session& s)
	349	{
95ef3b30 FCE	350	// NB: at this point, the binding is not unprivileged.
95ef3b30 FCE	351
83ea76b1	352	derived_probe_builder *builder = new perf_builder();
a3cf75e6	353	match_node* perf = s.pattern_root->bind(TOK_PERF);
83ea76b1	354
95ef3b30	355	match_node* event = perf->bind_num(TOK_TYPE)->bind_num(TOK_CONFIG);
a3cf75e6 JS	356	event->bind(builder);
a3cf75e6 JS	357	event->bind_num(TOK_SAMPLE)->bind(builder);
6a8fe809 SC	358	event->bind_str(TOK_PROCESS)->bind(builder);
6a8fe809 SC	359	event->bind(TOK_PROCESS)->bind(builder);
3689db05 SC	360	event->bind_str(TOK_COUNTER)->bind(builder);
3689db05 SC	361	event->bind_str(TOK_PROCESS)->bind_str(TOK_COUNTER)->bind(builder);
83ea76b1 WC	362	}
83ea76b1 WC	363
01c2eefe	364	/* vim: set sw=2 ts=8 cino=>4,n-2,{2,^-2,t0,(0,u0,w1,M1 : */