Re: [Xenomai-core] preemptive doesn't work

[Roberto Bielli <roberto.bielli@domain.hid>]

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Hi Gilles,

i added this in configure of xenomai so i pass --enable-arm-mach=imx25

imx25)        arch=5
             tsc_type=__XN_TSC_TYPE_FREERUNNING;;

Furthermore in plat-mxc/include/mach/mxc.h explain which are cpumx2 and 
imx25 is NOT mx2
#define cpu_is_mx2()    (cpu_is_mx21() || cpu_is_mx27())

i don't understand a things.
Does the tsc necessary to calculate correct timer period, or can i 
disable tsc and xenomai continue work correctly ?

However i cannot use tsc in my simple application. I resend the simple C 
application that doesn't work.


Il 10/04/2012 13:25, Gilles Chanteperdrix ha scritto:
> On 04/10/2012 12:39 PM, Roberto Bielli wrote:
>> Hi Gilles,
>>
>> i tried your code but th behavior is the same.
>>
>> Then i tried a linux base app and works correctly.
> The tsc physical address passed to user-space looks wrong.
>
> void __ipipe_mach_get_tscinfo(struct __ipipe_tscinfo *info)
> {
> 	info->type = IPIPE_TSC_TYPE_FREERUNNING;
> 	if (cpu_is_mx1()) {
> #ifdef CONFIG_ARCH_MX1
> 		info->u.fr.counter = (unsigned *) (TIM1_BASE_ADDR + MX1_2_TCN);
> #endif
> 	} else if (cpu_is_mx2()) {
> #ifdef CONFIG_ARCH_MX2
> 		info->u.fr.counter = (unsigned *) (GPT1_BASE_ADDR + MX1_2_TCN);
> #endif
> 	} else if (cpu_is_mx3() || cpu_is_mx25() ) {
> #if defined CONFIG_ARCH_MX3 || defined CONFIG_ARCH_MX25
> 		info->u.fr.counter = (unsigned *) (GPT1_BASE_ADDR + MX3_TCN);
> #endif
> 	}
> 	info->u.fr.mask = 0xffffffff;
> 	info->u.fr.tsc =&tsc->full;
> }
>
> Here cpu_is_mx2() will return true, and we will not go to cpu_is_mx25().
>
> Are you using the tsc in user-space?
>
> If you are passing --enable-arm-mach=mx2 to xenomai configure
> script, you are using the tsc in user-space, and it is a wonder
> how it works.
>


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[-- Attachment #2: testpreempt.c --]
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#include <stdio.h>
#include <stdint.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <string.h>

#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>	/* for MCL_CURRENT and MCL_FUTURE */
#include <rtdm/rtdm.h>
#include <native/task.h>
#include <nucleus/trace.h>

#define GPIO6_ON 		*Gpio2ValAddr |= 1 << 6
#define GPIO6_OFF		*Gpio2ValAddr &= ~(1 << 6);

static RT_TASK rt_task_desc;
static RT_TASK tsk2ms;

	//dati per la gestione memoria mappata
static unsigned long * Gpio2ValAddr = NULL;

volatile int cnt2ms = 0;
volatile int cntmain = 0;
volatile int x;

void funct2ms( void * params )
{
	for(;;)
	{
		GPIO6_ON;
		rt_task_sleep( 2000000 );
		++ cnt2ms;
		GPIO6_OFF;
	}
}

int main(int argc, char *argv[])
{
	int count = 0;
	int traceOn = 0;
	int fd, ret;

	// no memory-swapping for this programm
	ret = mlockall(MCL_CURRENT | MCL_FUTURE);
	if( ret )
	{
		perror("ERROR : mlockall has failled");
		exit(1);
	}


	fd = open( "/dev/mem", O_RDWR | O_SYNC );
	printf( "FD=%d", fd );
	fflush( stdout );

	Gpio2ValAddr = (unsigned long  *)mmap(  NULL, 0x1000, PROT_READ | PROT_WRITE,  MAP_SHARED, fd, 0x53FD0000 );
	GPIO6_ON;
	GPIO6_OFF;

	rt_task_create( &tsk2ms, "task2ms",0, 99, 0 );
	rt_task_start( &tsk2ms, funct2ms, NULL );
	
	ret = rt_task_shadow(&rt_task_desc, NULL, 1, 0);
	if( ret != 0 )
	{
		fprintf(stderr, "ERROR : rt_task_shadow: %s\n", strerror(-ret));
		exit( 1 );
	}

	for(;;)
	{
		for( x=0; x < 1000000; x++ );
		for( x=0; x < 1000000; x++ );
		//xntrace_user_freeze(0, 0);
		for( x=0; x < 1000000; x++ );
		for( x=0; x < 1000000; x++ );
		rt_task_sleep( 10000000 );
	}

	return 0;
}