mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-20 06:07:59 +00:00
eaac3cc1bd
This patch curates the API documentation to become suitable for the functional specificaton, which is partially generated from the header files.
370 lines
12 KiB
C++
370 lines
12 KiB
C++
/*
|
|
* \brief CPU (processing time) manager session interface
|
|
* \author Christian Helmuth
|
|
* \date 2006-06-27
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2006-2013 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__CPU_SESSION__CPU_SESSION_H_
|
|
#define _INCLUDE__CPU_SESSION__CPU_SESSION_H_
|
|
|
|
#include <cpu_session/capability.h>
|
|
#include <base/stdint.h>
|
|
#include <base/exception.h>
|
|
#include <base/thread_state.h>
|
|
#include <base/rpc_args.h>
|
|
#include <base/signal.h>
|
|
#include <base/affinity.h>
|
|
#include <thread/capability.h>
|
|
#include <pager/capability.h>
|
|
#include <session/session.h>
|
|
#include <ram_session/ram_session.h>
|
|
|
|
namespace Genode { struct Cpu_session; }
|
|
|
|
|
|
struct Genode::Cpu_session : Session
|
|
{
|
|
/*********************
|
|
** Exception types **
|
|
*********************/
|
|
|
|
class Thread_creation_failed : public Exception { };
|
|
class State_access_failed : public Exception { };
|
|
class Quota_exceeded : public Thread_creation_failed { };
|
|
class Out_of_metadata : public Exception { };
|
|
|
|
static const char *service_name() { return "CPU"; }
|
|
|
|
enum { THREAD_NAME_LEN = 48 };
|
|
enum { PRIORITY_LIMIT = 1 << 16 };
|
|
enum { QUOTA_LIMIT_LOG2 = 15 };
|
|
enum { QUOTA_LIMIT = 1 << QUOTA_LIMIT_LOG2 };
|
|
enum { DEFAULT_PRIORITY = 0 };
|
|
|
|
typedef Rpc_in_buffer<THREAD_NAME_LEN> Name;
|
|
|
|
virtual ~Cpu_session() { }
|
|
|
|
/**
|
|
* Create a new thread
|
|
*
|
|
* \param quota CPU quota that shall be granted to the thread
|
|
* \param name name for the thread
|
|
* \param utcb Base of the UTCB that will be used by the thread
|
|
* \return capability representing the new thread
|
|
* \throw Thread_creation_failed
|
|
* \throw Out_of_metadata
|
|
* \throw Quota_exceeded
|
|
*/
|
|
virtual Thread_capability create_thread(size_t quota,
|
|
Name const &name,
|
|
addr_t utcb = 0) = 0;
|
|
|
|
/**
|
|
* Get dataspace of the UTCB that is used by the specified thread
|
|
*/
|
|
virtual Ram_dataspace_capability utcb(Thread_capability thread) = 0;
|
|
|
|
/**
|
|
* Kill an existing thread
|
|
*
|
|
* \param thread capability of the thread to kill
|
|
*/
|
|
virtual void kill_thread(Thread_capability thread) = 0;
|
|
|
|
/**
|
|
* Set paging capabilities for thread
|
|
*
|
|
* \param thread thread to configure
|
|
* \param pager capability used to propagate page faults
|
|
*/
|
|
virtual int set_pager(Thread_capability thread,
|
|
Pager_capability pager) = 0;
|
|
|
|
/**
|
|
* Modify instruction and stack pointer of thread - start the
|
|
* thread
|
|
*
|
|
* \param thread thread to start
|
|
* \param ip initial instruction pointer
|
|
* \param sp initial stack pointer
|
|
*
|
|
* \return 0 on success
|
|
*/
|
|
virtual int start(Thread_capability thread, addr_t ip, addr_t sp) = 0;
|
|
|
|
/**
|
|
* Pause the specified thread
|
|
*
|
|
* After calling this method, the execution of the thread can be
|
|
* continued by calling 'resume'.
|
|
*/
|
|
virtual void pause(Thread_capability thread) = 0;
|
|
|
|
/**
|
|
* Resume the specified thread
|
|
*/
|
|
virtual void resume(Thread_capability thread) = 0;
|
|
|
|
/**
|
|
* Cancel a currently blocking operation
|
|
*
|
|
* \param thread thread to unblock
|
|
*/
|
|
virtual void cancel_blocking(Thread_capability thread) = 0;
|
|
|
|
/**
|
|
* Get the current state of a specific thread
|
|
*
|
|
* \param thread targeted thread
|
|
* \return state of the targeted thread
|
|
* \throw State_access_failed
|
|
*/
|
|
virtual Thread_state state(Thread_capability thread) = 0;
|
|
|
|
/**
|
|
* Override the current state of a specific thread
|
|
*
|
|
* \param thread targeted thread
|
|
* \param state state that shall be applied
|
|
* \throw State_access_failed
|
|
*/
|
|
virtual void state(Thread_capability thread,
|
|
Thread_state const &state) = 0;
|
|
|
|
/**
|
|
* Register signal handler for exceptions of the specified thread
|
|
*
|
|
* If 'thread' is an invalid capability, the default exception
|
|
* handler for the CPU session is set. This handler is used for
|
|
* all threads that have no explicitly installed exception handler.
|
|
* The new default signal handler will take effect for threads
|
|
* created after the call.
|
|
*
|
|
* On Linux, this exception is delivered when the process triggers
|
|
* a SIGCHLD. On other platforms, this exception is delivered on
|
|
* the occurrence of CPU exceptions such as division by zero.
|
|
*/
|
|
virtual void exception_handler(Thread_capability thread,
|
|
Signal_context_capability handler) = 0;
|
|
|
|
/**
|
|
* Enable/disable single stepping for specified thread.
|
|
*
|
|
* Since this method is currently supported by a small number of
|
|
* platforms, we provide a default implementation
|
|
*
|
|
* \param thread thread to set into single step mode
|
|
* \param enable true = enable single-step mode; false = disable
|
|
*/
|
|
virtual void single_step(Thread_capability, bool) {}
|
|
|
|
/**
|
|
* Return affinity space of CPU nodes available to the CPU session
|
|
*
|
|
* The dimension of the affinity space as returned by this method
|
|
* represent the physical CPUs that are available.
|
|
*/
|
|
virtual Affinity::Space affinity_space() const = 0;
|
|
|
|
/**
|
|
* Define affinity of thread to one or multiple CPU nodes
|
|
*
|
|
* In the normal case, a thread is assigned to a single CPU.
|
|
* Specifying more than one CPU node is supposed to principally
|
|
* allow a CPU service to balance the load of threads among
|
|
* multiple CPUs.
|
|
*/
|
|
virtual void affinity(Thread_capability thread,
|
|
Affinity::Location affinity) = 0;
|
|
|
|
/**
|
|
* Translate generic priority value to kernel-specific priority levels
|
|
*
|
|
* \param pf_prio_limit maximum priority used for the kernel, must
|
|
* be power of 2
|
|
* \param prio generic priority value as used by the CPU
|
|
* session interface
|
|
* \param inverse order of platform priorities, if true
|
|
* 'pf_prio_limit' corresponds to the highest
|
|
* priority, otherwise it refers to the
|
|
* lowest priority.
|
|
* \return platform-specific priority value
|
|
*/
|
|
static unsigned scale_priority(unsigned pf_prio_limit, unsigned prio,
|
|
bool inverse = true)
|
|
{
|
|
/*
|
|
* Generic priority values are (0 is highest, 'PRIORITY_LIMIT'
|
|
* is lowest. On platforms where priority levels are defined
|
|
* the other way round, we have to invert the priority value.
|
|
*/
|
|
prio = inverse ? Cpu_session::PRIORITY_LIMIT - prio : prio;
|
|
|
|
/* scale value to platform priority range 0..pf_prio_limit */
|
|
return (prio*pf_prio_limit)/Cpu_session::PRIORITY_LIMIT;
|
|
}
|
|
|
|
/**
|
|
* Request trace control dataspace
|
|
*
|
|
* The trace-control dataspace is used to propagate tracing
|
|
* control information from core to the threads of a CPU session.
|
|
*
|
|
* The trace-control dataspace is accounted to the CPU session.
|
|
*/
|
|
virtual Dataspace_capability trace_control() = 0;
|
|
|
|
/**
|
|
* Request index of a trace control block for given thread
|
|
*
|
|
* The trace control dataspace contains the control blocks for
|
|
* all threads of the CPU session. Each thread gets assigned a
|
|
* different index by the CPU service.
|
|
*/
|
|
virtual unsigned trace_control_index(Thread_capability thread) = 0;
|
|
|
|
/**
|
|
* Request trace buffer for the specified thread
|
|
*
|
|
* The trace buffer is not accounted to the CPU session. It is
|
|
* owned by a TRACE session.
|
|
*/
|
|
virtual Dataspace_capability trace_buffer(Thread_capability thread) = 0;
|
|
|
|
/**
|
|
* Request trace policy
|
|
*
|
|
* The trace policy buffer is not accounted to the CPU session. It
|
|
* is owned by a TRACE session.
|
|
*/
|
|
virtual Dataspace_capability trace_policy(Thread_capability thread) = 0;
|
|
|
|
/**
|
|
* Define reference account for the CPU session
|
|
*
|
|
* \param cpu_session reference account
|
|
*
|
|
* \return 0 on success
|
|
*
|
|
* Each CPU session requires another CPU session as reference
|
|
* account to transfer quota to and from. The reference account can
|
|
* be defined only once.
|
|
*/
|
|
virtual int ref_account(Cpu_session_capability cpu_session) = 0;
|
|
|
|
/**
|
|
* Transfer quota to another CPU session
|
|
*
|
|
* \param cpu_session receiver of quota donation
|
|
* \param amount amount of quota to donate
|
|
* \return 0 on success
|
|
*
|
|
* Quota can only be transfered if the specified CPU session is
|
|
* either the reference account for this session or vice versa.
|
|
*/
|
|
virtual int transfer_quota(Cpu_session_capability cpu_session,
|
|
size_t amount) = 0;
|
|
|
|
/**
|
|
* Return current quota limit
|
|
*/
|
|
virtual size_t quota() = 0;
|
|
|
|
/**
|
|
* Return amount of used quota
|
|
*/
|
|
virtual size_t used() = 0;
|
|
|
|
/**
|
|
* Return amount of available quota
|
|
*/
|
|
size_t avail()
|
|
{
|
|
size_t q = quota(), u = used();
|
|
return q > u ? q - u : 0;
|
|
}
|
|
|
|
/**
|
|
* Transform percentage of CPU utilization into CPU quota
|
|
*/
|
|
static size_t pc_to_quota(size_t const pc) {
|
|
return (pc << QUOTA_LIMIT_LOG2) / 100; }
|
|
|
|
/*********************
|
|
** RPC declaration **
|
|
*********************/
|
|
|
|
GENODE_RPC_THROW(Rpc_create_thread, Thread_capability, create_thread,
|
|
GENODE_TYPE_LIST(Thread_creation_failed, Out_of_metadata),
|
|
size_t, Name const &, addr_t);
|
|
GENODE_RPC(Rpc_utcb, Ram_dataspace_capability, utcb, Thread_capability);
|
|
GENODE_RPC(Rpc_kill_thread, void, kill_thread, Thread_capability);
|
|
GENODE_RPC(Rpc_set_pager, int, set_pager, Thread_capability, Pager_capability);
|
|
GENODE_RPC(Rpc_start, int, start, Thread_capability, addr_t, addr_t);
|
|
GENODE_RPC(Rpc_pause, void, pause, Thread_capability);
|
|
GENODE_RPC(Rpc_resume, void, resume, Thread_capability);
|
|
GENODE_RPC(Rpc_cancel_blocking, void, cancel_blocking, Thread_capability);
|
|
GENODE_RPC_THROW(Rpc_get_state, Thread_state, state,
|
|
GENODE_TYPE_LIST(State_access_failed),
|
|
Thread_capability);
|
|
GENODE_RPC_THROW(Rpc_set_state, void, state,
|
|
GENODE_TYPE_LIST(State_access_failed),
|
|
Thread_capability, Thread_state const &);
|
|
GENODE_RPC(Rpc_exception_handler, void, exception_handler,
|
|
Thread_capability, Signal_context_capability);
|
|
GENODE_RPC(Rpc_single_step, void, single_step, Thread_capability, bool);
|
|
GENODE_RPC(Rpc_affinity_space, Affinity::Space, affinity_space);
|
|
GENODE_RPC(Rpc_affinity, void, affinity, Thread_capability, Affinity::Location);
|
|
GENODE_RPC(Rpc_trace_control, Dataspace_capability, trace_control);
|
|
GENODE_RPC(Rpc_trace_control_index, unsigned, trace_control_index, Thread_capability);
|
|
GENODE_RPC(Rpc_trace_buffer, Dataspace_capability, trace_buffer, Thread_capability);
|
|
GENODE_RPC(Rpc_trace_policy, Dataspace_capability, trace_policy, Thread_capability);
|
|
GENODE_RPC(Rpc_ref_account, int, ref_account, Cpu_session_capability);
|
|
GENODE_RPC(Rpc_transfer_quota, int, transfer_quota, Cpu_session_capability, size_t);
|
|
GENODE_RPC(Rpc_quota, size_t, quota);
|
|
GENODE_RPC(Rpc_used, size_t, used);
|
|
|
|
/*
|
|
* 'GENODE_RPC_INTERFACE' declaration done manually
|
|
*
|
|
* The number of RPC functions of this interface exceeds the maximum
|
|
* number of elements supported by 'Meta::Type_list'. Therefore, we
|
|
* construct the type list by hand using nested type tuples instead
|
|
* of employing the convenience macro 'GENODE_RPC_INTERFACE'.
|
|
*/
|
|
typedef Meta::Type_tuple<Rpc_create_thread,
|
|
Meta::Type_tuple<Rpc_utcb,
|
|
Meta::Type_tuple<Rpc_kill_thread,
|
|
Meta::Type_tuple<Rpc_set_pager,
|
|
Meta::Type_tuple<Rpc_start,
|
|
Meta::Type_tuple<Rpc_pause,
|
|
Meta::Type_tuple<Rpc_resume,
|
|
Meta::Type_tuple<Rpc_cancel_blocking,
|
|
Meta::Type_tuple<Rpc_set_state,
|
|
Meta::Type_tuple<Rpc_get_state,
|
|
Meta::Type_tuple<Rpc_exception_handler,
|
|
Meta::Type_tuple<Rpc_single_step,
|
|
Meta::Type_tuple<Rpc_affinity_space,
|
|
Meta::Type_tuple<Rpc_affinity,
|
|
Meta::Type_tuple<Rpc_trace_control,
|
|
Meta::Type_tuple<Rpc_trace_control_index,
|
|
Meta::Type_tuple<Rpc_trace_buffer,
|
|
Meta::Type_tuple<Rpc_trace_policy,
|
|
Meta::Type_tuple<Rpc_ref_account,
|
|
Meta::Type_tuple<Rpc_transfer_quota,
|
|
Meta::Type_tuple<Rpc_quota,
|
|
Meta::Type_tuple<Rpc_used,
|
|
Meta::Empty>
|
|
> > > > > > > > > > > > > > > > > > > > > Rpc_functions;
|
|
};
|
|
|
|
#endif /* _INCLUDE__CPU_SESSION__CPU_SESSION_H_ */
|