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l4lx: avoid creation of redundant thread for vcpus

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This commit simplifies the creation of additional threads and VCPUs in L4linux.
By now, some Genode::Thread_base methods where overridden to use a Fiasco.OC
specific Cpu_session when creating threads.
Recent commit: 297538678e06fe091fe6c3370d38c54d33627109 moved the actual creation
of the platform thread into the constructor of the generic Thread_base class.
Thereby the Vcpu class, which extended the Thread_base class, now unnecessarily
created two platform threads for each thread created via Vcpu. Nowadays, the
cpu_session capability is available via the Genode::env() environment. So we can
use the Thread_base parent class for the setup of the platform thread, and
afterwards create a Fiasco.OC specific cpu session client with the same cpu
session capability, Thread_base used for creation, to make use of the L4Linux
specific features of this interface (VCPU enabling, irq object creation etc.).
This commit is contained in:
Stefan Kalkowski 2013-03-26 17:29:43 +01:00 committed by Norman Feske
parent 074e522990
commit ae1985bde2
2 changed files with 28 additions and 59 deletions
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77
ports-foc/src/lib/l4lx/include/vcpu.h
View File

@ -28,33 +28,20 @@ namespace Fiasco {
namespace L4lx {
extern Genode::Foc_cpu_connection *vcpu_connection();
extern Genode::Foc_cpu_session_client *vcpu_connection();
class Vcpu : public Genode::Thread_base
{
private:
Genode::Lock _lock;
L4_CV void (*_func)(void *data);
unsigned long _data;
Genode::addr_t _vcpu_state;
Timer::Connection _timer;
unsigned _cpu_nr;
static void _startup()
{
/* start thread function */
Vcpu* vcpu = reinterpret_cast<Vcpu*>(Genode::Thread_base::myself());
vcpu->entry();
}
protected:
void entry() {
_func(&_data);
Genode::sleep_forever();
}
public:
Vcpu(const char *str,
@ -64,55 +51,37 @@ namespace L4lx {
Genode::addr_t vcpu_state,
unsigned cpu_nr)
: Genode::Thread_base(str, stack_size),
_lock(Genode::Cancelable_lock::LOCKED),
_func(func),
_data(data ? *data : 0),
_vcpu_state(vcpu_state),
_cpu_nr(cpu_nr)
{
start();
/* set l4linux specific utcb entry: L4X_UTCB_TCR_ID */
l4_utcb_tcr_u(utcb())->user[0] = tid();
/* enable vcpu functionality respectively */
if (_vcpu_state)
vcpu_connection()->enable_vcpu(_thread_cap, _vcpu_state);
/* set cpu affinity */
set_affinity(_cpu_nr);
}
void entry()
{
using namespace Genode;
using namespace Fiasco;
/* create thread at core */
char buf[48];
name(buf, sizeof(buf));
_thread_cap = vcpu_connection()->create_thread(buf);
/* assign thread to protection domain */
env()->pd_session()->bind_thread(_thread_cap);
/* create new pager object and assign it to the new thread */
_pager_cap = env()->rm_session()->add_client(_thread_cap);
vcpu_connection()->set_pager(_thread_cap, _pager_cap);
/* get gate-capability and badge of new thread */
Thread_state state = vcpu_connection()->state(_thread_cap);
_tid = state.kcap;
_context->utcb = state.utcb;
Cap_index *i = cap_map()->insert(state.id, state.kcap);
l4_utcb_tcr_u(state.utcb)->user[UTCB_TCR_BADGE] = (unsigned long) i;
l4_utcb_tcr_u(state.utcb)->user[UTCB_TCR_THREAD_OBJ] = (addr_t)this;
l4_utcb_tcr_u(state.utcb)->user[0] = state.kcap; /* L4X_UTCB_TCR_ID */
_lock.lock();
_func(&_data);
Genode::sleep_forever();
}
void start()
{
using namespace Genode;
/* register initial IP and SP at core */
addr_t stack = (addr_t)&_context->stack[-4];
stack &= ~0xf; /* align initial stack to 16 byte boundary */
vcpu_connection()->start(_thread_cap, (addr_t)_startup, stack);
if (_vcpu_state)
vcpu_connection()->enable_vcpu(_thread_cap, _vcpu_state);
set_affinity(_cpu_nr);
}
void unblock() { _lock.unlock(); }
Genode::addr_t sp() {
return ((Genode::addr_t)&_context->stack[-4]) & ~0xf; }
Genode::addr_t ip() { return (Genode::addr_t)_startup; }
Genode::addr_t ip() { return (Genode::addr_t)_func; }
Fiasco::l4_utcb_t *utcb() { return _context->utcb; };

10
ports-foc/src/lib/l4lx/l4lx_thread.cc
View File

@ -48,12 +48,12 @@ static l4_addr_t utcb_base_addr()
return _addr;
}
Genode::Foc_cpu_connection* L4lx::vcpu_connection()
Genode::Foc_cpu_session_client* L4lx::vcpu_connection()
{
using namespace Genode;
static Foc_cpu_connection _con;
return &_con;
static Foc_cpu_session_client _client(Genode::env()->cpu_session_cap());
return &_client;
}
@ -143,7 +143,7 @@ l4lx_thread_t l4lx_thread_create(L4_CV void (*thread_func)(void *data),
vcpus[thread_id(vc->utcb())] = vc;
if (!deferstart)
vc->start();
vc->unblock();
else {
deferstart->l4cap = (l4_cap_idx_t) vc;
deferstart->sp = (l4_umword_t)vc->sp();
@ -161,7 +161,7 @@ int l4lx_thread_start(struct l4lx_thread_start_info_t *startinfo)
if (DEBUG)
PDBG("ip=%lx sp=%lx", startinfo->ip, startinfo->sp);
L4lx::Vcpu *vc = (L4lx::Vcpu*) startinfo->l4cap;
vc->start();
vc->unblock();
return 0;
}