959572968d
This patch enable clients of core's TRACE service to obtain the execution times of trace subjects (i.e., threads). The execution time is delivered as part of the 'Subject_info' structure. Right now, the feature is available solely on NOVA. On all other base platforms, the returned execution times are 0. Issue #813
323 lines
7.6 KiB
C++
323 lines
7.6 KiB
C++
/*
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* \brief Fiasco thread facility
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* \author Stefan Kalkowski
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* \date 2011-01-04
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*/
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/*
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* Copyright (C) 2011-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <base/ipc.h>
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#include <base/printf.h>
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#include <util/string.h>
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/* core includes */
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#include <cap_session_component.h>
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#include <platform_thread.h>
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#include <platform.h>
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#include <core_env.h>
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/* Fiasco includes */
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namespace Fiasco {
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#include <l4/sys/debugger.h>
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#include <l4/sys/factory.h>
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#include <l4/sys/irq.h>
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#include <l4/sys/scheduler.h>
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#include <l4/sys/thread.h>
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#include <l4/sys/types.h>
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}
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using namespace Genode;
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using namespace Fiasco;
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int Platform_thread::start(void *ip, void *sp)
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{
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/* map the pager cap */
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if (_platform_pd)
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_pager.map(_platform_pd->native_task().dst());
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/* reserve utcb area and associate thread with this task */
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l4_thread_control_start();
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l4_thread_control_pager(_pager.remote);
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l4_thread_control_exc_handler(_pager.remote);
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l4_thread_control_bind(_utcb, _platform_pd->native_task().dst());
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l4_msgtag_t tag = l4_thread_control_commit(_thread.local.dst());
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if (l4_msgtag_has_error(tag)) {
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PWRN("l4_thread_control_commit for %lx failed!",
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(unsigned long) _thread.local.dst());
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return -1;
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}
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_state = RUNNING;
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/* set ip and sp and run the thread */
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tag = l4_thread_ex_regs(_thread.local.dst(), (l4_addr_t) ip,
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(l4_addr_t) sp, 0);
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if (l4_msgtag_has_error(tag)) {
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PWRN("l4_thread_ex_regs failed!");
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return -1;
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}
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return 0;
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}
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void Platform_thread::pause()
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{
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if (!_pager_obj)
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return;
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_pager_obj->state.lock.lock();
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if (_pager_obj->state.paused == true) {
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_pager_obj->state.lock.unlock();
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return;
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}
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unsigned exc = _pager_obj->state.exceptions;
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_pager_obj->state.ip = ~0UL;
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_pager_obj->state.sp = ~0UL;
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l4_umword_t flags = L4_THREAD_EX_REGS_TRIGGER_EXCEPTION;
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/* Mark thread to be stopped */
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_pager_obj->state.paused = true;
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/*
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* Force the thread to be paused to trigger an exception.
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* The pager thread, which also acts as exception handler, will
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* leave the thread in exception state until, it gets woken again
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*/
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l4_thread_ex_regs_ret(_thread.local.dst(), &_pager_obj->state.ip,
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&_pager_obj->state.sp, &flags);
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/*
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* The thread state ("ready") is encoded in the lowest bit of the flags.
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*/
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bool in_syscall = (flags & 1) == 0;
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_pager_obj->state.lock.unlock();
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/**
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* Check whether the thread was in ongoing ipc, if so it won't raise
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* an exception before ipc is completed.
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*/
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if (!in_syscall) {
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/*
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* Wait until the pager thread got an exception from
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* the requested thread, and stored its thread state
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*/
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while (exc == _pager_obj->state.exceptions && !_pager_obj->state.in_exception)
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l4_thread_switch(_thread.local.dst());
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}
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}
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void Platform_thread::resume()
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{
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if (!_pager_obj)
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return;
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_pager_obj->state.lock.lock();
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/* Mark thread to be runable again */
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_pager_obj->state.paused = false;
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_pager_obj->state.lock.unlock();
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/* Send a message to the exception handler, to unblock the client */
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Msgbuf<16> snd, rcv;
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Ipc_client ipc_client(_pager_obj->cap(), &snd, &rcv);
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ipc_client << _pager_obj << IPC_CALL;
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}
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void Platform_thread::bind(Platform_pd *pd)
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{
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_platform_pd = pd;
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_gate.map(pd->native_task().dst());
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_irq.map(pd->native_task().dst());
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}
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void Platform_thread::unbind()
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{
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if (_state == RUNNING) {
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/* first set the thread as its own pager */
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l4_thread_control_start();
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l4_thread_control_pager(_gate.remote);
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l4_thread_control_exc_handler(_gate.remote);
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if (l4_msgtag_has_error(l4_thread_control_commit(_thread.local.dst())))
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PWRN("l4_thread_control_commit for %lx failed!",
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(unsigned long) _thread.local.dst());
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/* now force it into a pagefault */
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l4_thread_ex_regs(_thread.local.dst(), 0, 0, L4_THREAD_EX_REGS_CANCEL);
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}
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_platform_pd = (Platform_pd*) 0;
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}
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void Platform_thread::pager(Pager_object *pager_obj)
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{
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_pager_obj = pager_obj;
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if (_pager_obj)
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_pager.local = pager_obj->cap();
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else
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_pager.local = Native_capability();
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}
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void Platform_thread::state(Thread_state s)
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{
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if (_pager_obj)
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_pager_obj->state = s;
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}
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Thread_state Platform_thread::state()
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{
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Thread_state s;
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if (_pager_obj) s = _pager_obj->state;
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s.kcap = _gate.remote;
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s.id = _gate.local.local_name();
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s.utcb = _utcb;
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return s;
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}
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void Platform_thread::cancel_blocking()
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{
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l4_irq_trigger(_irq.local.dst());
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}
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void Platform_thread::affinity(Affinity::Location location)
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{
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_location = location;
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int const cpu = location.xpos();
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l4_sched_param_t params = l4_sched_param(_prio);
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params.affinity = l4_sched_cpu_set(cpu, 0, 1);
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l4_msgtag_t tag = l4_scheduler_run_thread(L4_BASE_SCHEDULER_CAP,
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_thread.local.dst(), ¶ms);
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if (l4_error(tag))
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PWRN("setting affinity of %lx to %d failed!", _thread.local.dst(), cpu);
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}
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Affinity::Location Platform_thread::affinity() const
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{
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return _location;
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}
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void Platform_thread::_create_thread()
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{
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l4_msgtag_t tag = l4_factory_create_thread(L4_BASE_FACTORY_CAP,
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_thread.local.dst());
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if (l4_msgtag_has_error(tag))
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PERR("cannot create more thread kernel-objects!");
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/* create initial gate for thread */
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_gate.local = Cap_session_component::alloc(0, _thread.local);
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}
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void Platform_thread::_finalize_construction(const char *name)
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{
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/* create irq for new thread */
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l4_msgtag_t tag = l4_factory_create_irq(L4_BASE_FACTORY_CAP,
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_irq.local.dst());
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if (l4_msgtag_has_error(tag))
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PWRN("creating thread's irq failed");
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/* attach thread to irq */
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tag = l4_irq_attach(_irq.local.dst(), 0, _thread.local.dst());
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if (l4_msgtag_has_error(tag))
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PWRN("attaching thread's irq failed");
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/* set human readable name in kernel debugger */
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strncpy(_name, name, sizeof(_name));
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Fiasco::l4_debugger_set_object_name(_thread.local.dst(), name);
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/* set priority of thread */
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l4_sched_param_t params = l4_sched_param(_prio);
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l4_scheduler_run_thread(L4_BASE_SCHEDULER_CAP, _thread.local.dst(),
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¶ms);
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}
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Weak_ptr<Address_space> Platform_thread::address_space()
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{
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return _platform_pd->Address_space::weak_ptr();
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}
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Platform_thread::Platform_thread(const char *name, unsigned prio, addr_t)
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: _state(DEAD),
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_core_thread(false),
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_thread(true),
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_irq(true),
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_utcb(0),
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_platform_pd(0),
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_pager_obj(0),
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_prio(Cpu_session::scale_priority(DEFAULT_PRIORITY, prio))
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{
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((Core_cap_index*)_thread.local.idx())->pt(this);
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_create_thread();
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_finalize_construction(name);
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}
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Platform_thread::Platform_thread(Core_cap_index* thread,
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Core_cap_index* irq, const char *name)
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: _state(RUNNING),
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_core_thread(true),
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_thread(Native_capability(thread), L4_BASE_THREAD_CAP),
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_irq(Native_capability(irq)),
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_utcb(0),
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_platform_pd(0),
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_pager_obj(0),
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_prio(Cpu_session::scale_priority(DEFAULT_PRIORITY, 0))
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{
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reinterpret_cast<Core_cap_index*>(_thread.local.idx())->pt(this);
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_finalize_construction(name);
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}
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Platform_thread::Platform_thread(const char *name)
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: _state(DEAD),
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_core_thread(true),
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_thread(true),
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_irq(true),
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_utcb(0),
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_platform_pd(0),
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_pager_obj(0),
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_prio(Cpu_session::scale_priority(DEFAULT_PRIORITY, 0))
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{
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((Core_cap_index*)_thread.local.idx())->pt(this);
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_create_thread();
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_finalize_construction(name);
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}
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Platform_thread::~Platform_thread()
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{
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_gate.local.idx()->dec();
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/*
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* We inform our protection domain about thread destruction, which will end up in
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* Thread::unbind()
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*/
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if (_platform_pd)
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_platform_pd->unbind_thread(this);
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}
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