385 lines
13 KiB
C++
385 lines
13 KiB
C++
/*
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* \brief CPU (processing time) manager session interface
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* \author Christian Helmuth
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* \date 2006-06-27
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*
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* :Question:
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*
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* Why are thread operations not methods of the thread but
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* methods of the CPU session?
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*
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* :Answer:
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*
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* This enables the CPU session to impose policies on thread
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* operations. These policies are based on the session
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* construction arguments. If thread operations would be
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* provided as thread methods, Thread would need to consult
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* its container object (its CPU session) about the authorization
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* of each operation and, thereby, would introduce a circular
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* dependency between CPU session and Thread.
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*/
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/*
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* Copyright (C) 2006-2013 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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#ifndef _INCLUDE__CPU_SESSION__CPU_SESSION_H_
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#define _INCLUDE__CPU_SESSION__CPU_SESSION_H_
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#include <cpu_session/capability.h>
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#include <base/stdint.h>
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#include <base/exception.h>
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#include <base/thread_state.h>
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#include <base/rpc_args.h>
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#include <base/signal.h>
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#include <base/affinity.h>
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#include <thread/capability.h>
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#include <pager/capability.h>
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#include <session/session.h>
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#include <ram_session/ram_session.h>
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namespace Genode {
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struct Cpu_session : Session
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{
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/*********************
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** Exception types **
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*********************/
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class Thread_creation_failed : public Exception { };
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class State_access_failed : public Exception { };
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class Quota_exceeded : public Thread_creation_failed { };
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class Out_of_metadata : public Exception { };
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static const char *service_name() { return "CPU"; }
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enum { THREAD_NAME_LEN = 48 };
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enum { PRIORITY_LIMIT = 1 << 16 };
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enum { QUOTA_LIMIT_LOG2 = 15 };
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enum { QUOTA_LIMIT = 1 << QUOTA_LIMIT_LOG2 };
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enum { DEFAULT_PRIORITY = 0 };
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typedef Rpc_in_buffer<THREAD_NAME_LEN> Name;
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virtual ~Cpu_session() { }
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/**
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* Create a new thread
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*
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* \param quota CPU quota that shall be granted to the thread
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* \param name name for the thread
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* \param utcb Base of the UTCB that will be used by the thread
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* \return capability representing the new thread
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* \throw Thread_creation_failed
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* \throw Out_of_metadata
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* \throw Quota_exceeded
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*/
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virtual Thread_capability create_thread(size_t quota,
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Name const &name,
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addr_t utcb = 0) = 0;
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/**
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* Get dataspace of the UTCB that is used by the specified thread
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*/
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virtual Ram_dataspace_capability utcb(Thread_capability thread) = 0;
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/**
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* Kill an existing thread
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*
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* \param thread capability of the thread to kill
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*/
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virtual void kill_thread(Thread_capability thread) = 0;
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/**
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* Set paging capabilities for thread
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*
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* \param thread thread to configure
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* \param pager capability used to propagate page faults
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*/
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virtual int set_pager(Thread_capability thread,
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Pager_capability pager) = 0;
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/**
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* Modify instruction and stack pointer of thread - start the
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* thread
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*
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* \param thread thread to start
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* \param ip initial instruction pointer
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* \param sp initial stack pointer
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*
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* \return 0 on success
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*/
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virtual int start(Thread_capability thread, addr_t ip, addr_t sp) = 0;
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/**
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* Pause the specified thread
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*
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* After calling this function, the execution of the thread can be
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* continued by calling 'resume'.
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*/
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virtual void pause(Thread_capability thread) = 0;
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/**
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* Resume the specified thread
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*/
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virtual void resume(Thread_capability thread) = 0;
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/**
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* Cancel a currently blocking operation
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*
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* \param thread thread to unblock
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*/
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virtual void cancel_blocking(Thread_capability thread) = 0;
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/**
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* Get the current state of a specific thread
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*
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* \param thread targeted thread
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* \return state of the targeted thread
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* \throw State_access_failed
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*/
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virtual Thread_state state(Thread_capability thread) = 0;
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/**
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* Override the current state of a specific thread
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*
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* \param thread targeted thread
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* \param state state that shall be applied
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* \throw State_access_failed
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*/
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virtual void state(Thread_capability thread,
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Thread_state const &state) = 0;
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/**
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* Register signal handler for exceptions of the specified thread
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*
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* If 'thread' is an invalid capability, the default exception
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* handler for the CPU session is set. This handler is used for
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* all threads that have no explicitly installed exception handler.
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* The new default signal handler will take effect for threads
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* created after the call.
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*
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* On Linux, this exception is delivered when the process triggers
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* a SIGCHLD. On other platforms, this exception is delivered on
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* the occurrence of CPU exceptions such as division by zero.
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*/
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virtual void exception_handler(Thread_capability thread,
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Signal_context_capability handler) = 0;
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/**
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* Enable/disable single stepping for specified thread.
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*
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* Since this functions is currently supported by a small number of
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* platforms, we provide a default implementation
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*
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* \param thread thread to set into single step mode
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* \param enable true = enable single-step mode; false = disable
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*/
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virtual void single_step(Thread_capability, bool) {}
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/**
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* Return affinity space of CPU nodes available to the CPU session
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*
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* The dimension of the affinity space as returned by this function
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* represent the physical CPUs that are available.
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*/
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virtual Affinity::Space affinity_space() const = 0;
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/**
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* Define affinity of thread to one or multiple CPU nodes
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*
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* In the normal case, a thread is assigned to a single CPU.
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* Specifying more than one CPU node is supposed to principally
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* allow a CPU service to balance the load of threads among
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* multiple CPUs.
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*/
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virtual void affinity(Thread_capability thread,
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Affinity::Location affinity) = 0;
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/**
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* Translate generic priority value to kernel-specific priority levels
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*
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* \param pf_prio_limit maximum priority used for the kernel, must
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* be power of 2
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* \param prio generic priority value as used by the CPU
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* session interface
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* \param inverse order of platform priorities, if true
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* 'pf_prio_limit' corresponds to the highest
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* priority, otherwise it refers to the
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* lowest priority.
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* \return platform-specific priority value
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*/
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static unsigned scale_priority(unsigned pf_prio_limit, unsigned prio,
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bool inverse = true)
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{
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/*
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* Generic priority values are (0 is highest, 'PRIORITY_LIMIT'
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* is lowest. On platforms where priority levels are defined
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* the other way round, we have to invert the priority value.
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*/
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prio = inverse ? Cpu_session::PRIORITY_LIMIT - prio : prio;
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/* scale value to platform priority range 0..pf_prio_limit */
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return (prio*pf_prio_limit)/Cpu_session::PRIORITY_LIMIT;
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}
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/**
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* Request trace control dataspace
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*
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* The trace-control dataspace is used to propagate tracing
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* control information from core to the threads of a CPU session.
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*
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* The trace-control dataspace is accounted to the CPU session.
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*/
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virtual Dataspace_capability trace_control() = 0;
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/**
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* Request index of a trace control block for given thread
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*
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* The trace control dataspace contains the control blocks for
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* all threads of the CPU session. Each thread gets assigned a
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* different index by the CPU service.
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*/
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virtual unsigned trace_control_index(Thread_capability thread) = 0;
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/**
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* Request trace buffer for the specified thread
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*
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* The trace buffer is not accounted to the CPU session. It is
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* owned by a TRACE session.
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*/
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virtual Dataspace_capability trace_buffer(Thread_capability thread) = 0;
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/**
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* Request trace policy
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*
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* The trace policy buffer is not accounted to the CPU session. It
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* is owned by a TRACE session.
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*/
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virtual Dataspace_capability trace_policy(Thread_capability thread) = 0;
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/**
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* Define reference account for the CPU session
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*
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* \param cpu_session reference account
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*
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* \return 0 on success
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*
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* Each CPU session requires another CPU session as reference
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* account to transfer quota to and from. The reference account can
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* be defined only once.
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*/
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virtual int ref_account(Cpu_session_capability cpu_session) = 0;
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/**
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* Transfer quota to another CPU session
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*
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* \param cpu_session receiver of quota donation
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* \param amount amount of quota to donate
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* \return 0 on success
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*
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* Quota can only be transfered if the specified CPU session is
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* either the reference account for this session or vice versa.
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*/
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virtual int transfer_quota(Cpu_session_capability cpu_session,
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size_t amount) = 0;
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/**
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* Return current quota limit
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*/
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virtual size_t quota() = 0;
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/**
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* Return amount of used quota
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*/
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virtual size_t used() = 0;
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/**
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* Return amount of available quota
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*/
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size_t avail()
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{
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size_t q = quota(), u = used();
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return q > u ? q - u : 0;
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}
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/**
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* Transform percentage of CPU utilization into CPU quota
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*/
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static size_t pc_to_quota(size_t const pc) {
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return (pc << QUOTA_LIMIT_LOG2) / 100; }
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/*********************
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** RPC declaration **
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*********************/
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GENODE_RPC_THROW(Rpc_create_thread, Thread_capability, create_thread,
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GENODE_TYPE_LIST(Thread_creation_failed, Out_of_metadata),
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size_t, Name const &, addr_t);
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GENODE_RPC(Rpc_utcb, Ram_dataspace_capability, utcb, Thread_capability);
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GENODE_RPC(Rpc_kill_thread, void, kill_thread, Thread_capability);
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GENODE_RPC(Rpc_set_pager, int, set_pager, Thread_capability, Pager_capability);
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GENODE_RPC(Rpc_start, int, start, Thread_capability, addr_t, addr_t);
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GENODE_RPC(Rpc_pause, void, pause, Thread_capability);
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GENODE_RPC(Rpc_resume, void, resume, Thread_capability);
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GENODE_RPC(Rpc_cancel_blocking, void, cancel_blocking, Thread_capability);
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GENODE_RPC_THROW(Rpc_get_state, Thread_state, state,
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GENODE_TYPE_LIST(State_access_failed),
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Thread_capability);
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GENODE_RPC_THROW(Rpc_set_state, void, state,
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GENODE_TYPE_LIST(State_access_failed),
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Thread_capability, Thread_state const &);
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GENODE_RPC(Rpc_exception_handler, void, exception_handler,
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Thread_capability, Signal_context_capability);
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GENODE_RPC(Rpc_single_step, void, single_step, Thread_capability, bool);
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GENODE_RPC(Rpc_affinity_space, Affinity::Space, affinity_space);
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GENODE_RPC(Rpc_affinity, void, affinity, Thread_capability, Affinity::Location);
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GENODE_RPC(Rpc_trace_control, Dataspace_capability, trace_control);
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GENODE_RPC(Rpc_trace_control_index, unsigned, trace_control_index, Thread_capability);
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GENODE_RPC(Rpc_trace_buffer, Dataspace_capability, trace_buffer, Thread_capability);
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GENODE_RPC(Rpc_trace_policy, Dataspace_capability, trace_policy, Thread_capability);
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GENODE_RPC(Rpc_ref_account, int, ref_account, Cpu_session_capability);
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GENODE_RPC(Rpc_transfer_quota, int, transfer_quota, Cpu_session_capability, size_t);
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GENODE_RPC(Rpc_quota, size_t, quota);
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GENODE_RPC(Rpc_used, size_t, used);
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/*
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* 'GENODE_RPC_INTERFACE' declaration done manually
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*
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* The number of RPC function of this interface exceeds the maximum
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* number of elements supported by 'Meta::Type_list'. Therefore, we
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* construct the type list by hand using nested type tuples instead
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* of employing the convenience macro 'GENODE_RPC_INTERFACE'.
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*/
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typedef Meta::Type_tuple<Rpc_create_thread,
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Meta::Type_tuple<Rpc_utcb,
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Meta::Type_tuple<Rpc_kill_thread,
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Meta::Type_tuple<Rpc_set_pager,
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Meta::Type_tuple<Rpc_start,
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Meta::Type_tuple<Rpc_pause,
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Meta::Type_tuple<Rpc_resume,
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Meta::Type_tuple<Rpc_cancel_blocking,
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Meta::Type_tuple<Rpc_set_state,
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Meta::Type_tuple<Rpc_get_state,
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Meta::Type_tuple<Rpc_exception_handler,
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Meta::Type_tuple<Rpc_single_step,
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Meta::Type_tuple<Rpc_affinity_space,
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Meta::Type_tuple<Rpc_affinity,
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Meta::Type_tuple<Rpc_trace_control,
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Meta::Type_tuple<Rpc_trace_control_index,
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Meta::Type_tuple<Rpc_trace_buffer,
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Meta::Type_tuple<Rpc_trace_policy,
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Meta::Type_tuple<Rpc_ref_account,
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Meta::Type_tuple<Rpc_transfer_quota,
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Meta::Type_tuple<Rpc_quota,
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Meta::Type_tuple<Rpc_used,
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Meta::Empty>
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> > > > > > > > > > > > > > > > > > > > > Rpc_functions;
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};
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}
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#endif /* _INCLUDE__CPU_SESSION__CPU_SESSION_H_ */
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