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//==========================================================================

//

//        smp.cxx

//

//        SMP tests

//

//==========================================================================

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//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):     nickg

// Contributors:  nickg

// Date:          2001-06-18

// Description:   Some basic SMP tests.

//

//####DESCRIPTIONEND####

//==========================================================================

#include <pkgconf/kernel.h>

#include <pkgconf/hal.h>

#if 1

#include <cyg/kernel/sched.hxx>

#include <cyg/kernel/thread.hxx>

#include <cyg/kernel/thread.inl>

#include <cyg/kernel/mutex.hxx>

#include <cyg/kernel/sema.hxx>

#include <cyg/kernel/sched.inl>

#include <cyg/kernel/clock.hxx>

#include <cyg/kernel/clock.inl>

#endif

#include <cyg/kernel/kapi.h>

#include <cyg/infra/testcase.h>

#include <cyg/infra/diag.h>

//==========================================================================

#if defined(CYGPKG_KERNEL_SMP_SUPPORT) &&       \

    defined(CYGFUN_KERNEL_API_C) &&             \

    defined(CYGSEM_KERNEL_SCHED_MLQUEUE) &&     \

    defined(CYGVAR_KERNEL_COUNTERS_CLOCK) &&    \

    !defined(CYGPKG_HAL_I386_LINUX) &&          \

    !defined(CYGDBG_INFRA_DIAG_USE_DEVICE) &&   \

    (CYGNUM_KERNEL_SCHED_PRIORITIES > 12)

//==========================================================================

#define NTHREADS 1

#include "testaux.hxx"

#define STACK_SIZE CYGNUM_HAL_STACK_SIZE_TYPICAL

#define NTHREADS_MAX (CYGNUM_KERNEL_CPU_MAX*3)

static int ncpus = CYGNUM_KERNEL_CPU_MAX;

static int nthread = NTHREADS_MAX;

static char stacks[NTHREADS_MAX][STACK_SIZE];

static cyg_thread test_threads[NTHREADS_MAX];

static cyg_handle_t threads[NTHREADS_MAX];

static volatile cyg_uint32 cpu_run[CYGNUM_KERNEL_CPU_MAX];

static volatile int failed = false;

static volatile cyg_uint32 cpu_thread[CYGNUM_KERNEL_CPU_MAX];

static volatile cyg_uint32 slicerun[NTHREADS_MAX][CYGNUM_KERNEL_CPU_MAX];

static cyg_mutex_t mx;

//==========================================================================

// Compute a name for a thread

char *

thread_name(char *basename, int indx) {

    return "<<NULL>>";  // Not currently used

}

//==========================================================================

void

test_thread_cpu(CYG_ADDRESS id)

{

    for(;;)

        cpu_run[CYG_KERNEL_CPU_THIS()] = true;

}

//==========================================================================

// First test: just run as many threads as CPUs and check that we

// get to run on each CPU.

void run_smp_test_cpus()

{

    int i;

    CYG_TEST_INFO( "CPU Test: Check CPUs functional");

    // Init flags.

    for (i = 0;  i < ncpus;  i++)

        cpu_run[i] = false;

    // Set my priority higher than any I plan to create

    cyg_thread_set_priority(cyg_thread_self(), 2);

    for (i = 0;  i < ncpus;  i++) {

        cyg_thread_create(10,              // Priority - just a number

                          test_thread_cpu, // entry

                          i,               // index

                          thread_name("thread", i),     // Name

                          &stacks[i][0],   // Stack

                          STACK_SIZE,      // Size

                          &threads[i],     // Handle

                          &test_threads[i] // Thread data structure

            );

        cyg_thread_resume( threads[i]);

    }

    // Just wait a while, until the threads have all run for a bit.

    cyg_thread_delay( 10 );

    // Delete all the threads

    for (i = 0;  i < ncpus;  i++) {

        cyg_thread_delete(threads[i]);

    }

    // And check that a thread ran on each CPU

    for (i = 0;  i < ncpus;  i++) {

//        CYG_TEST_CHECK( cpu_run[i], "CPU didn't run");

        if( !cpu_run[i] )

        {

            CYG_TEST_INFO( "CPU didn't run" );

            failed++;

        }

    }

    CYG_TEST_INFO( "CPU Test: done");

}

//==========================================================================

void

test_thread_pri(CYG_ADDRESS id)

{

    for(;;)

    {

        cpu_thread[CYG_KERNEL_CPU_THIS()] = id;

    }

}

//==========================================================================

// Second test: Run a thread on each CPU and then by manipulating the

// priorities, get the current thread to migrate to each CPU in turn.

void run_smp_test_pri()

{

    int i;

    CYG_TEST_INFO( "Pri Test: Check set_priority functionality");

    // Init flags.

    for (i = 0;  i < ncpus;  i++)

        cpu_run[i] = false;

    // Set my priority higher than any I plan to creat

    cyg_thread_set_priority(cyg_thread_self(), 2);

    for (i = 0;  i < ncpus;  i++) {

        cyg_thread_create(10,              // Priority - just a number

                          test_thread_pri, // entry

                          i,               // index

                          thread_name("thread", i),     // Name

                          &stacks[i][0],   // Stack

                          STACK_SIZE,      // Size

                          &threads[i],     // Handle

                          &test_threads[i] // Thread data structure

            );

        cyg_thread_resume( threads[i]);

    }

    cyg_thread_delay( 2 );

    cyg_handle_t cthread = threads[0];

    cyg_thread_set_priority(cthread, 25);

    // Just wait a while, until the threads have all run for a bit.

    cyg_thread_delay( 2 );

    for (i = 0;  i < ncpus*500;  i++)

    {

        HAL_SMP_CPU_TYPE cpu = i % CYG_KERNEL_CPU_COUNT();

        if( cpu != CYG_KERNEL_CPU_THIS() )

        {

            // At this point we have the current thread running on a

            // CPU at priority 2, ncpus-1 threads running at priority

            // 10 and the last thread (cthread) in the run queue at

            // priority 25.

            // Pick a thread on a different CPU

            cyg_handle_t dthread;

            do

            {

                dthread = threads[cpu_thread[cpu]];

            } while( dthread == cthread );

            // Change the priority of the victim thread to 20. It is

            // still higher priority than cthread so it will continue

            // running.

            cyg_thread_set_priority(dthread, 20);

            // Now change our priority to 15. We are still higher

            // priority that cthread so we will still run.

            cyg_thread_set_priority(cyg_thread_self(), 15);

            // Finally change the priority of cthread to 10. This will

            // cause it to preempt us on the current CPU. In turn we

            // will preempt dthread on its CPU.

            // NOTE: This relies somewhat on the SMP scheduler doing

            // what we expect here. Specifically, that it will preempt

            // the current thread with cthread locally. A more

            // sophisticated scheduler might decide that the most

            // efficient thing to do is to preempt dthread with

            // cthread remotely, leaving the current thread where it

            // is. If we ever bother to implement this, then this test

            // will need to change.

            cyg_thread_set_priority(cthread, 10);

            // Spin here a while until the scheduler sorts itself out.

            for( int j = 0; j < 100000; j++ );

            // Indicate that we have run on this CPU

            cpu_run[CYG_KERNEL_CPU_THIS()]++;

            // Restore our priority to 2 and depress dthread to 25 and

            // make it the new cthread.

            cyg_thread_set_priority(cyg_thread_self(), 2);

            cyg_thread_set_priority(dthread, 25);

            cthread = dthread;

        }

    }

    // Delete all the threads

    for (i = 0;  i < ncpus;  i++) {

        cyg_thread_delete(threads[i]);

    }

    // And check that a thread ran on each CPU

    for (i = 0;  i < ncpus;  i++) {

//        CYG_TEST_CHECK( cpu_run[i], "CPU didn't run");

        if( !cpu_run[i] )

        {

            CYG_TEST_INFO( "CPU didn't run" );

            failed++;

        }

    }

    CYG_TEST_INFO( "PRI Test: done");

}

//==========================================================================

void

test_thread_timeslice(CYG_ADDRESS id)

{

    for(;;)

        slicerun[id][CYG_KERNEL_CPU_THIS()]++;

}

//==========================================================================

// First test: just run as many threads as CPUs and check that we

// get to run on each CPU.

void run_smp_test_timeslice()

{

    int i;

    CYG_TEST_INFO( "Timeslice Test: Check timeslicing works");

    // Init flags.

    for (i = 0;  i < nthread;  i++)

        for( int j = 0; j < ncpus; j++ )

            slicerun[i][j] = 0;

    // Set my priority higher than any I plan to create

    cyg_thread_set_priority(cyg_thread_self(), 2);

    for (i = 0;  i < nthread;  i++) {

        cyg_thread_create(10,              // Priority - just a number

                          test_thread_timeslice, // entry

                          i,               // index

                          thread_name("thread", i),     // Name

                          &stacks[i][0],   // Stack

                          STACK_SIZE,      // Size

                          &threads[i],     // Handle

                          &test_threads[i] // Thread data structure

            );

        cyg_thread_resume( threads[i]);

    }

    // Just wait a while, until the threads have all run for a bit.

    cyg_thread_delay( 200 );

    // Delete all the threads

    for (i = 0;  i < nthread;  i++) {

        cyg_thread_suspend(threads[i]);

    }

    // And check that a thread ran on each CPU

    cyg_uint32 cpu_total[ncpus];

    cyg_uint32 cpu_threads[ncpus];

    cyg_uint32 thread_total[nthread];

    diag_printf(" Thread ");

    for( int j = 0; j < ncpus; j++ )

    {

        cpu_total[j] = 0;

        cpu_threads[j] = 0;

        diag_printf("   CPU %2d",j);

    }

    diag_printf("   Total\n");

    for (i = 0;  i < nthread;  i++)

    {

        thread_total[i] = 0;

        diag_printf("     %2d ",i);

        for( int j = 0; j < ncpus; j++ )

        {

            thread_total[i] += slicerun[i][j];

            cpu_total[j] += slicerun[i][j];

            if( slicerun[i][j] > 0 )

                cpu_threads[j]++;

            diag_printf(" %8d",slicerun[i][j]);

        }

        diag_printf("%8d\n",thread_total[i]);

    }

    diag_printf(" Total  ");

    for( int j = 0; j < ncpus; j++ )

        diag_printf(" %8d",cpu_total[j]);

    diag_printf("\n");

    diag_printf("Threads ");

    for( int j = 0; j < ncpus; j++ )

    {

        diag_printf(" %8d",cpu_threads[j]);

        if( cpu_threads[j] < 2 )

            failed++;

    }

    diag_printf("\n");

    // Delete all the threads

    for (i = 0;  i < nthread;  i++) {

        cyg_thread_delete(threads[i]);

    }

    CYG_TEST_INFO( "Timeslice Test: done");

}

//==========================================================================

void

run_smp_tests(CYG_ADDRESS id)

{

    cyg_mutex_init( &mx );

    for( int i = 0; i < 100; i++ )

    {

        run_smp_test_cpus();

        run_smp_test_pri();

        run_smp_test_timeslice();

    }

    if( failed )

        CYG_TEST_FAIL_FINISH("SMP tests failed\n");

    CYG_TEST_PASS_FINISH("SMP tests OK");

}

//==========================================================================

void smp_main( void )

{

    CYG_TEST_INIT();

    // Work out how many CPUs we actually have.

    ncpus = CYG_KERNEL_CPU_COUNT();

    new_thread(run_smp_tests, 0);

    cyg_scheduler_start();

}

//==========================================================================

#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG

externC void

cyg_hal_invoke_constructors();

#endif

externC void

cyg_start( void )

{

#ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG

    cyg_hal_invoke_constructors();

#endif

    smp_main();

}

//==========================================================================

#else // CYGPKG_KERNEL_SMP_SUPPORT etc.

externC void

cyg_start( void )

{

    CYG_TEST_INIT();

    CYG_TEST_NA("SMP test requires:\n"

                "CYGPKG_KERNEL_SMP_SUPPORT &&\n"

                "CYGFUN_KERNEL_API_C && \n"

                "CYGSEM_KERNEL_SCHED_MLQUEUE &&\n"

                "CYGVAR_KERNEL_COUNTERS_CLOCK &&\n"

                "!CYGPKG_HAL_I386_LINUX &&\n"

                "!CYGDBG_INFRA_DIAG_USE_DEVICE &&\n"

                "(CYGNUM_KERNEL_SCHED_PRIORITIES > 12)\n");

}

#endif // CYGPKG_KERNEL_SMP_SUPPORT etc.

//==========================================================================

// EOF tm_basic.cxx