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rtems/cpukit/libmisc/capture/capture.c
Sebastian Huber cfe6d05e3b capture: Fix lock initialization
2015-01-09 14:03:32 +01:00

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/*
------------------------------------------------------------------------
Copyright Objective Design Systems Pty Ltd, 2002
All rights reserved Objective Design Systems Pty Ltd, 2002
Chris Johns (ccj@acm.org)
COPYRIGHT (c) 1989-2014.
On-Line Applications Research Corporation (OAR).
The license and distribution terms for this file may be
found in the file LICENSE in this distribution.
This software with is provided ``as is'' and with NO WARRANTY.
------------------------------------------------------------------------
RTEMS Performance Monitoring and Measurement Framework.
This is the Capture Engine component.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "captureimpl.h"
#include "capture_buffer.h"
#include <rtems/score/statesimpl.h>
#include <rtems/score/todimpl.h>
/*
* These events are always recorded and are not part of the
* watch filters.
*
* This feature has been disabled as it becomes confusing when
* setting up filters and some event leak.
*/
#if defined (RTEMS_CAPTURE_ENGINE_ALLOW_RELATED_EVENTS)
#define RTEMS_CAPTURE_RECORD_EVENTS (RTEMS_CAPTURE_CREATED_BY_EVENT | \
RTEMS_CAPTURE_CREATED_EVENT | \
RTEMS_CAPTURE_STARTED_BY_EVENT | \
RTEMS_CAPTURE_STARTED_EVENT | \
RTEMS_CAPTURE_RESTARTED_BY_EVENT | \
RTEMS_CAPTURE_RESTARTED_EVENT | \
RTEMS_CAPTURE_DELETED_BY_EVENT | \
RTEMS_CAPTURE_DELETED_EVENT | \
RTEMS_CAPTURE_BEGIN_EVENT | \
RTEMS_CAPTURE_EXITTED_EVENT | \
RTEMS_CAPTURE_TERMINATED_EVENT | \
RTEMS_CAPTURE_AUTOGEN_ENTRY_EVENT | \
RTEMS_CAPTURE_AUTOGEN_EXIT_EVENT)
#else
#define RTEMS_CAPTURE_RECORD_EVENTS (0)
#endif
typedef struct {
rtems_capture_buffer_t records;
uint32_t count;
rtems_id reader;
rtems_interrupt_lock lock;
uint32_t flags;
} rtems_capture_per_cpu_data;
typedef struct {
uint32_t flags;
rtems_capture_control_t* controls;
int extension_index;
rtems_capture_timestamp timestamp;
rtems_task_priority ceiling;
rtems_task_priority floor;
rtems_interrupt_lock lock;
} rtems_capture_global_data;
static rtems_capture_per_cpu_data *capture_per_cpu = NULL;
static rtems_capture_global_data capture_global = {
.lock = RTEMS_INTERRUPT_LOCK_INITIALIZER( "Capture" )
};
/*
* RTEMS Capture Data.
*/
#define capture_per_cpu_get( _cpu ) \
( &capture_per_cpu[ _cpu ] )
#define capture_records_on_cpu( _cpu ) capture_per_cpu[ _cpu ].records
#define capture_count_on_cpu( _cpu ) capture_per_cpu[ _cpu ].count
#define capture_flags_on_cpu( _cpu ) capture_per_cpu[ _cpu ].flags
#define capture_reader_on_cpu( _cpu ) capture_per_cpu[ _cpu ].reader
#define capture_lock_on_cpu( _cpu ) capture_per_cpu[ _cpu ].lock
#define capture_records capture_records_on_cpu( _SMP_Get_current_processor() )
#define capture_count capture_count_on_cpu( _SMP_Get_current_processor() )
#define capture_flags_per_cpu capture_flags_on_cpu( _SMP_Get_current_processor() )
#define capture_flags_global capture_global.flags
#define capture_controls capture_global.controls
#define capture_extension_index capture_global.extension_index
#define capture_timestamp capture_global.timestamp
#define capture_ceiling capture_global.ceiling
#define capture_floor capture_global.floor
#define capture_reader capture_reader_on_cpu( _SMP_Get_current_processor() )
#define capture_lock_per_cpu capture_lock_on_cpu( _SMP_Get_current_processor() )
#define capture_lock_global capture_global.lock
/*
* RTEMS Event text.
*/
static const char * const capture_event_text[] =
{
"CREATED_BY",
"CREATED",
"STARTED_BY",
"STARTED",
"RESTARTED_BY",
"RESTARTED",
"DELETED_BY",
"DELETED",
"TERMINATED",
"BEGIN",
"EXITTED",
"SWITCHED_OUT",
"SWITCHED_IN",
"TIMESTAMP"
};
void rtems_capture_set_extension_index(int index)
{
capture_extension_index = index;
}
int rtems_capture_get_extension_index(void)
{
return capture_extension_index;
}
uint32_t rtems_capture_get_flags(void)
{
return capture_flags_global;
}
void rtems_capture_set_flags(uint32_t mask)
{
capture_flags_global |= mask;
}
/*
* This function returns the current time. If a handler is provided
* by the user get the time from that.
*/
void
rtems_capture_get_time (rtems_capture_time_t* time)
{
if (capture_timestamp)
capture_timestamp (time);
else
{
*time = rtems_clock_get_uptime_nanoseconds ();
}
}
/*
* This function compares rtems_names. It protects the
* capture engine from a change to the way names are supported
* in RTEMS.
*/
static inline bool
rtems_capture_match_names (rtems_name lhs, rtems_name rhs)
{
return lhs == rhs;
}
/*
* This function compares rtems_ids. It protects the
* capture engine from a change to the way id are supported
* in RTEMS.
*/
static inline bool
rtems_capture_match_ids (rtems_id lhs, rtems_id rhs)
{
return lhs == rhs;
}
/*
* This function matches a name and/or id.
*/
static inline bool
rtems_capture_match_name_id (rtems_name lhs_name,
rtems_id lhs_id,
rtems_name rhs_name,
rtems_id rhs_id)
{
/*
* The left hand side name or id could be 0 which means a wildcard.
*/
if ((lhs_name == 0) && (lhs_id == rhs_id))
return 1;
else if ((lhs_id == 0) || (lhs_id == rhs_id))
{
if (rtems_capture_match_names (lhs_name, rhs_name))
return 1;
}
return 0;
}
/*
* This function duplicates an rtems_names. It protects the
* capture engine from a change to the way names are supported
* in RTEMS.
*/
static inline void
rtems_capture_dup_name (rtems_name* dst, rtems_name src)
{
*dst = src;
}
/*
* This function sees if a BY control is in the BY names. The use
* of the valid_mask in this way assumes the number of trigger
* tasks is the number of bits in uint32_t.
*/
static inline bool
rtems_capture_by_in_to (uint32_t events,
rtems_tcb* by,
rtems_capture_control_t* to)
{
uint32_t valid_mask = RTEMS_CAPTURE_CONTROL_FROM_MASK (0);
uint32_t valid_remainder = 0xffffffff;
int i;
for (i = 0; i < RTEMS_CAPTURE_TRIGGER_TASKS; i++)
{
/*
* If there are no more valid BY entries then
* we are finished.
*/
if ((valid_remainder & to->by_valid) == 0)
break;
/*
* Is the froby entry valid and does its name or id match.
*/
if ((valid_mask & to->by_valid) &&
(to->by[i].trigger & events))
{
/*
* We have the BY task on the right hand side so we
* match with id's first then labels if the id's are
* not set.
*/
if (rtems_capture_match_name_id (to->by[i].name, to->by[i].id,
rtems_capture_task_name( by ),
by->Object.id))
return 1;
}
valid_mask >>= 1;
valid_remainder >>= 1;
}
return 0;
}
/*
* This function searches for a trigger given a name.
*/
static inline rtems_capture_control_t*
rtems_capture_find_control (rtems_name name, rtems_id id)
{
rtems_capture_control_t* control;
for (control = capture_controls; control != NULL; control = control->next)
if (rtems_capture_match_name_id (name, id, control->name, control->id))
break;
return control;
}
/*
* This function checks if a new control structure matches
* the given task and sets the control if it does.
*/
static void
rtems_capture_initialize_control (rtems_tcb *tcb)
{
rtems_name name;
rtems_capture_control_t* control;
/*
* We need to scan the default control list to initialise
* this control.
*/
rtems_object_get_classic_name( tcb->Object.id, &name );
control = capture_controls;
if (rtems_capture_match_name_id (control->name, control->id,
name, tcb->Object.id))
tcb->Capture.control = control;
}
/*
* This function creates a capture control for the capture engine.
*/
static inline rtems_capture_control_t*
rtems_capture_create_control (rtems_name name, rtems_id id)
{
rtems_interrupt_lock_context lock_context;
rtems_capture_control_t* control;
if ((name == 0) && (id == 0))
return NULL;
control = rtems_capture_find_control (name, id);
if (control == NULL)
{
control = malloc( sizeof (*control));
if (!control)
{
capture_flags_global |= RTEMS_CAPTURE_NO_MEMORY;
return NULL;
}
control->name = name;
control->id = id;
control->flags = 0;
control->to_triggers = 0;
control->from_triggers = 0;
control->by_valid = 0;
memset (control->by, 0, sizeof (control->by));
rtems_interrupt_lock_acquire (&capture_lock_global, &lock_context);
control->next = capture_controls;
capture_controls = control;
rtems_iterate_over_all_threads (rtems_capture_initialize_control);
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
}
return control;
}
void rtems_capture_initialize_task( rtems_tcb* tcb )
{
rtems_capture_control_t* control;
rtems_name name;
rtems_interrupt_lock_context lock_context;
/*
* We need to scan the default control list to initialize
* this control if it is a new task.
*/
rtems_object_get_classic_name( tcb->Object.id, &name );
rtems_interrupt_lock_acquire (&capture_lock_global, &lock_context);
if (tcb->Capture.control == NULL) {
for (control = capture_controls; control != NULL; control = control->next)
if (rtems_capture_match_name_id (control->name, control->id,
name, tcb->Object.id))
tcb->Capture.control = control;
}
tcb->Capture.flags |= RTEMS_CAPTURE_INIT_TASK;
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
}
void rtems_capture_record_task( rtems_tcb* tcb )
{
rtems_capture_task_record_t rec;
void* ptr;
rtems_interrupt_lock_context lock_context;
rtems_object_get_classic_name( tcb->Object.id, &rec.name );
rec.stack_size = tcb->Start.Initial_stack.size;
rec.start_priority = _RTEMS_tasks_Priority_from_Core(
tcb->Start.initial_priority
);
rtems_interrupt_lock_acquire (&capture_lock_global, &lock_context);
tcb->Capture.flags |= RTEMS_CAPTURE_RECORD_TASK;
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
/*
* Log the task information. The first time a task is
* seen a record is logged. This record can be identified
* by a 0 in the event identifier.
*/
rtems_capture_begin_add_record (tcb, 0, sizeof(rec), &ptr);
ptr = rtems_capture_append_to_record(
ptr,
&rec.name,
sizeof( rec.name )
);
ptr = rtems_capture_append_to_record(
ptr,
&rec.start_priority,
sizeof( rec.start_priority)
);
ptr = rtems_capture_append_to_record(
ptr,
&rec.stack_size,
sizeof( rec.stack_size)
);
rtems_capture_end_add_record ( ptr );
}
/*
* This function indicates if data should be filtered from the
* log.
*/
bool rtems_capture_filter( rtems_tcb* tcb,
uint32_t events)
{
if (tcb &&
((capture_flags_global &
(RTEMS_CAPTURE_TRIGGERED | RTEMS_CAPTURE_ONLY_MONITOR)) ==
RTEMS_CAPTURE_TRIGGERED))
{
rtems_capture_control_t* control;
control = tcb->Capture.control;
/*
* Capture the record if we have an event that is always
* captured, or the task's real priority is greater than the
* watch ceiling, and the global watch or task watch is enabled.
*/
if ((events & RTEMS_CAPTURE_RECORD_EVENTS) ||
((tcb->real_priority >= capture_ceiling) &&
(tcb->real_priority <= capture_floor) &&
((capture_flags_global & RTEMS_CAPTURE_GLOBAL_WATCH) ||
(control && (control->flags & RTEMS_CAPTURE_WATCH)))))
{
return false;
}
}
return true;
}
/*
* This function records a capture record into the capture buffer.
*/
void *
rtems_capture_record_open (rtems_tcb* tcb,
uint32_t events,
size_t size,
rtems_interrupt_lock_context* lock_context)
{
uint8_t* ptr;
rtems_capture_record_t* capture_in;
rtems_interrupt_lock_acquire (&capture_lock_per_cpu, lock_context);
ptr = rtems_capture_buffer_allocate(&capture_records, size);
capture_in = (rtems_capture_record_t *) ptr;
if ( capture_in )
{
capture_count++;
capture_in->size = size;
capture_in->task_id = tcb->Object.id;
capture_in->events = (events |
(tcb->real_priority) |
(tcb->current_priority << 8));
if ((events & RTEMS_CAPTURE_RECORD_EVENTS) == 0)
tcb->Capture.flags |= RTEMS_CAPTURE_TRACED;
rtems_capture_get_time (&capture_in->time);
ptr = ptr + sizeof(*capture_in);
}
else
capture_flags_per_cpu |= RTEMS_CAPTURE_OVERFLOW;
return ptr;
}
void rtems_capture_record_close( void *rec, rtems_interrupt_lock_context* lock_context)
{
rtems_interrupt_lock_release (&capture_lock_per_cpu, lock_context);
}
/*
* See if we have triggered and if not see if this event is a
* cause of a trigger.
*/
bool
rtems_capture_trigger (rtems_tcb* ft,
rtems_tcb* tt,
uint32_t events)
{
/*
* If we have not triggered then see if this is a trigger condition.
*/
if (!(capture_flags_global & RTEMS_CAPTURE_TRIGGERED))
{
rtems_capture_control_t* fc = NULL;
rtems_capture_control_t* tc = NULL;
uint32_t from_events = 0;
uint32_t to_events = 0;
uint32_t from_to_events = 0;
if (ft)
{
fc = ft->Capture.control;
if (fc)
from_events = fc->from_triggers & events;
}
if (tt)
{
tc = tt->Capture.control;
if (tc)
{
to_events = tc->to_triggers & events;
if (ft && tc->by_valid)
from_to_events = tc->by_triggers & events;
}
}
/*
* Check if we have any from or to events. These are the
* from any or to any type triggers. All from/to triggers are
* listed in the to's control with the from in the from list.
*
* The masking above means any flag set is a trigger.
*/
if (from_events || to_events)
{
capture_flags_global |= RTEMS_CAPTURE_TRIGGERED;
return 1;
}
/*
* Check the from->to events.
*/
if (from_to_events)
{
if (rtems_capture_by_in_to (events, ft, tc))
{
capture_flags_global |= RTEMS_CAPTURE_TRIGGERED;
return 1;
}
}
return 0;
}
return 1;
}
/*
* This function initialises the realtime capture engine allocating the trace
* buffer. It is assumed we have a working heap at stage of initialization.
*/
rtems_status_code
rtems_capture_open (uint32_t size, rtems_capture_timestamp timestamp __attribute__((unused)))
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
size_t count;
uint32_t i;
rtems_capture_buffer_t* buff;
/*
* See if the capture engine is already open.
*/
if ((capture_flags_global & RTEMS_CAPTURE_INIT) == RTEMS_CAPTURE_INIT) {
return RTEMS_RESOURCE_IN_USE;
}
count = rtems_get_processor_count();
if (capture_per_cpu == NULL) {
capture_per_cpu = calloc( count, sizeof( *capture_per_cpu ) );
}
for (i=0; i<count; i++) {
buff = &capture_records_on_cpu(i);
rtems_capture_buffer_create( buff, size );
if (buff->buffer == NULL) {
sc = RTEMS_NO_MEMORY;
break;
}
rtems_interrupt_lock_initialize(
&capture_lock_on_cpu( i ),
"Capture Per-CPU"
);
}
capture_flags_global = 0;
capture_ceiling = 0;
capture_floor = 255;
if (sc == RTEMS_SUCCESSFUL)
sc = rtems_capture_user_extension_open();
if (sc != RTEMS_SUCCESSFUL)
{
for (i=0; i<count; i++)
rtems_capture_buffer_destroy( &capture_records_on_cpu(i));
} else {
capture_flags_global |= RTEMS_CAPTURE_INIT;
}
return sc;
}
/*
* This function shutdowns the capture engine and release any claimed
* resources. Capture control must be disabled prior to calling a close.
*/
rtems_status_code
rtems_capture_close (void)
{
rtems_interrupt_lock_context lock_context;
rtems_capture_control_t* control;
rtems_status_code sc;
uint32_t cpu;
rtems_interrupt_lock_acquire (&capture_lock_global, &lock_context);
if ((capture_flags_global & RTEMS_CAPTURE_INIT) != RTEMS_CAPTURE_INIT)
{
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
return RTEMS_SUCCESSFUL;
}
if ( (capture_flags_global & RTEMS_CAPTURE_ON) != 0 )
{
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
return RTEMS_UNSATISFIED;
}
capture_flags_global &=
~(RTEMS_CAPTURE_ON | RTEMS_CAPTURE_ONLY_MONITOR | RTEMS_CAPTURE_INIT);
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
/*
* Delete the extension first. This means we are now able to
* release the resources we have without them being used.
*/
sc = rtems_capture_user_extension_close();
if (sc != RTEMS_SUCCESSFUL)
return sc;
control = capture_controls;
while (control)
{
rtems_capture_control_t* delete = control;
control = control->next;
free (delete);
}
capture_controls = NULL;
for (cpu=0; cpu < rtems_get_processor_count(); cpu++) {
if (capture_records_on_cpu(cpu).buffer)
rtems_capture_buffer_destroy( &capture_records_on_cpu(cpu) );
rtems_interrupt_lock_destroy( &capture_lock_on_cpu( cpu ) );
}
free( capture_per_cpu );
capture_per_cpu = NULL;
return RTEMS_SUCCESSFUL;
}
rtems_status_code
rtems_capture_control (bool enable)
{
rtems_interrupt_lock_context lock_context;
rtems_interrupt_lock_acquire (&capture_lock_global, &lock_context);
if ((capture_flags_global & RTEMS_CAPTURE_INIT) != RTEMS_CAPTURE_INIT)
{
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
return RTEMS_UNSATISFIED;
}
if (enable)
capture_flags_global |= RTEMS_CAPTURE_ON;
else
capture_flags_global &= ~RTEMS_CAPTURE_ON;
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
return RTEMS_SUCCESSFUL;
}
/*
* This function enable the monitor mode. When in the monitor mode
* the tasks are monitored but no data is saved. This can be used
* to profile the load on a system.
*/
rtems_status_code
rtems_capture_monitor (bool enable)
{
rtems_interrupt_lock_context lock_context;
rtems_interrupt_lock_acquire (&capture_lock_global, &lock_context);
if ((capture_flags_global & RTEMS_CAPTURE_INIT) != RTEMS_CAPTURE_INIT)
{
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
return RTEMS_UNSATISFIED;
}
if (enable)
capture_flags_global |= RTEMS_CAPTURE_ONLY_MONITOR;
else
capture_flags_global &= ~RTEMS_CAPTURE_ONLY_MONITOR;
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
return RTEMS_SUCCESSFUL;
}
/*
* This function clears the capture trace flag in the tcb.
*/
static void
rtems_capture_flush_tcb (rtems_tcb *tcb)
{
tcb->Capture.flags &= ~RTEMS_CAPTURE_TRACED;
}
/*
* This function flushes the capture buffer. The prime parameter allows the
* capture engine to also be primed again.
*/
rtems_status_code
rtems_capture_flush (bool prime)
{
rtems_interrupt_lock_context lock_context_global;
rtems_interrupt_lock_context lock_context_per_cpu;
rtems_interrupt_lock* lock;
uint32_t cpu;
rtems_interrupt_lock_acquire (&capture_lock_global, &lock_context_global);
if ( (capture_flags_global & RTEMS_CAPTURE_ON) != 0 )
{
rtems_interrupt_lock_release (&capture_lock_global, &lock_context_global);
return RTEMS_UNSATISFIED;
}
rtems_iterate_over_all_threads (rtems_capture_flush_tcb);
if (prime)
capture_flags_global &= ~(RTEMS_CAPTURE_TRIGGERED | RTEMS_CAPTURE_OVERFLOW);
else
capture_flags_global &= ~RTEMS_CAPTURE_OVERFLOW;
for (cpu=0; cpu < rtems_get_processor_count(); cpu++) {
lock = &(capture_lock_on_cpu( cpu ));
rtems_interrupt_lock_acquire (lock, &lock_context_per_cpu);
capture_count_on_cpu(cpu) = 0;
if (capture_records_on_cpu(cpu).buffer)
rtems_capture_buffer_flush( &capture_records_on_cpu(cpu) );
rtems_interrupt_lock_release (lock, &lock_context_per_cpu);
}
rtems_interrupt_lock_release (&capture_lock_global, &lock_context_global);
return RTEMS_SUCCESSFUL;
}
/*
* This function defines a watch for a specific task given a name. A watch
* causes it to be traced either in or out of context. The watch can be
* optionally enabled or disabled with the set routine. It is disabled by
* default. A watch can only be defined when capture control is disabled
*/
rtems_status_code
rtems_capture_watch_add (rtems_name name, rtems_id id)
{
rtems_capture_control_t* control;
if ( (capture_flags_global & RTEMS_CAPTURE_ON) != 0 )
return RTEMS_UNSATISFIED;
if ((name == 0) && (id == 0))
return RTEMS_UNSATISFIED;
control = rtems_capture_find_control (name, id);
if (control && !id)
return RTEMS_TOO_MANY;
if (!control)
control = rtems_capture_create_control (name, id);
if (!control)
return RTEMS_NO_MEMORY;
return RTEMS_SUCCESSFUL;
}
/*
* This function removes a watch for a specific task given a name. The task
* description will still exist if referenced by a trace record in the trace
* buffer or a global watch is defined. A watch can only be deleted when
* capture control is disabled.
*/
rtems_status_code
rtems_capture_watch_del (rtems_name name, rtems_id id)
{
rtems_interrupt_lock_context lock_context;
rtems_capture_control_t* control;
rtems_capture_control_t** prev_control;
bool found = false;
if ( (capture_flags_global & RTEMS_CAPTURE_ON) != 0 )
return RTEMS_UNSATISFIED;
/*
* Should this test be for wildcards ?
*/
for (prev_control = &capture_controls, control = capture_controls;
control != NULL; )
{
if (rtems_capture_match_name_id (control->name, control->id, name, id))
{
rtems_interrupt_lock_acquire (&capture_lock_global, &lock_context);
*prev_control = control->next;
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
free (control);
control = *prev_control;
found = true;
}
else
{
prev_control = &control->next;
control = control->next;
}
}
if (found)
return RTEMS_SUCCESSFUL;
return RTEMS_INVALID_NAME;
}
/*
* This function allows control of a watch. The watch can be enabled or
* disabled.
*/
rtems_status_code
rtems_capture_watch_ctrl (rtems_name name, rtems_id id, bool enable)
{
rtems_interrupt_lock_context lock_context;
rtems_capture_control_t* control;
bool found = false;
if ( (capture_flags_global & RTEMS_CAPTURE_ON) != 0 )
return RTEMS_UNSATISFIED;
/*
* Find the control and then set the watch. It must exist before it can
* be controlled.
*/
for (control = capture_controls; control != NULL; control = control->next)
{
if (rtems_capture_match_name_id (control->name, control->id, name, id))
{
rtems_interrupt_lock_acquire (&capture_lock_global, &lock_context);
if (enable)
control->flags |= RTEMS_CAPTURE_WATCH;
else
control->flags &= ~RTEMS_CAPTURE_WATCH;
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
found = true;
}
}
if (found)
return RTEMS_SUCCESSFUL;
return RTEMS_INVALID_NAME;
}
/*
* This function allows control of a global watch. The watch can be enabled or
* disabled. A global watch configures all tasks below the ceiling and above
* the floor to be traced.
*/
rtems_status_code
rtems_capture_watch_global (bool enable)
{
rtems_interrupt_lock_context lock_context;
rtems_interrupt_lock_acquire (&capture_lock_global, &lock_context);
/*
* We need to keep specific and global watches separate so
* a global enable/disable does not lose a specific watch.
*/
if (enable)
capture_flags_global |= RTEMS_CAPTURE_GLOBAL_WATCH;
else
capture_flags_global &= ~RTEMS_CAPTURE_GLOBAL_WATCH;
rtems_interrupt_lock_release (&capture_lock_global, &lock_context);
return RTEMS_SUCCESSFUL;
}
/*
* This function returns the global watch state.
*/
bool
rtems_capture_watch_global_on (void)
{
return capture_flags_global & RTEMS_CAPTURE_GLOBAL_WATCH ? 1 : 0;
}
/*
* This function sets a watch ceiling. Tasks at or greating that the
* ceiling priority are not watched. This is a simple way to monitor
* an application and exclude system tasks running at a higher
* priority level.
*/
rtems_status_code
rtems_capture_watch_ceiling (rtems_task_priority ceiling)
{
capture_ceiling = ceiling;
return RTEMS_SUCCESSFUL;
}
/*
* This function gets the watch ceiling.
*/
rtems_task_priority
rtems_capture_watch_get_ceiling (void)
{
return capture_ceiling;
}
/*
* This function sets a watch floor. Tasks at or less that the
* floor priority are not watched. This is a simple way to monitor
* an application and exclude system tasks running at a lower
* priority level.
*/
rtems_status_code
rtems_capture_watch_floor (rtems_task_priority floor)
{
capture_floor = floor;
return RTEMS_SUCCESSFUL;
}
/*
* This function gets the watch floor.
*/
rtems_task_priority
rtems_capture_watch_get_floor (void)
{
return capture_floor;
}
/*
* Map the trigger to a bit mask.
*/
static uint32_t
rtems_capture_map_trigger (rtems_capture_trigger_t trigger)
{
/*
* Transform the mode and trigger to a bit map.
*/
switch (trigger)
{
case rtems_capture_switch:
return RTEMS_CAPTURE_SWITCH;
case rtems_capture_create:
return RTEMS_CAPTURE_CREATE;
case rtems_capture_start:
return RTEMS_CAPTURE_START;
case rtems_capture_restart:
return RTEMS_CAPTURE_RESTART;
case rtems_capture_delete:
return RTEMS_CAPTURE_DELETE;
case rtems_capture_begin:
return RTEMS_CAPTURE_BEGIN;
case rtems_capture_exitted:
return RTEMS_CAPTURE_EXITTED;
case rtems_capture_terminated:
return RTEMS_CAPTURE_TERMINATED;
default:
break;
}
return 0;
}
/*
* This function sets a trigger.
*
* This set trigger routine will create a capture control for the
* target task. The task list is searched and any existing tasks
* are linked to the new control.
*
* We can have a number of tasks that have the same name so we
* search using names. This means a number of tasks can be
* linked to single control.
*/
rtems_status_code
rtems_capture_set_trigger (rtems_name from_name,
rtems_id from_id,
rtems_name to_name,
rtems_id to_id,
rtems_capture_trigger_mode_t mode,
rtems_capture_trigger_t trigger)
{
rtems_capture_control_t* control;
uint32_t flags;
flags = rtems_capture_map_trigger (trigger);
/*
* The mode sets the opposite type of trigger. For example
* FROM ANY means trigger when the event happens TO this
* task. TO ANY means FROM this task.
*/
if (mode == rtems_capture_to_any)
{
control = rtems_capture_create_control (from_name, from_id);
if (control == NULL)
return RTEMS_NO_MEMORY;
control->from_triggers |= flags & RTEMS_CAPTURE_FROM_TRIGS;
}
else
{
control = rtems_capture_create_control (to_name, to_id);
if (control == NULL)
return RTEMS_NO_MEMORY;
if (mode == rtems_capture_from_any)
control->to_triggers |= flags;
else
{
bool done = false;
int i;
control->by_triggers |= flags;
for (i = 0; i < RTEMS_CAPTURE_TRIGGER_TASKS; i++)
{
if (rtems_capture_control_by_valid (control, i) &&
((control->by[i].name == from_name) ||
(from_id && (control->by[i].id == from_id))))
{
control->by[i].trigger |= flags;
done = true;
break;
}
}
if (!done)
{
for (i = 0; i < RTEMS_CAPTURE_TRIGGER_TASKS; i++)
{
if (!rtems_capture_control_by_valid (control, i))
{
control->by_valid |= RTEMS_CAPTURE_CONTROL_FROM_MASK (i);
control->by[i].name = from_name;
control->by[i].id = from_id;
control->by[i].trigger = flags;
done = true;
break;
}
}
}
if (!done)
return RTEMS_TOO_MANY;
}
}
return RTEMS_SUCCESSFUL;
}
/*
* This function clear a trigger.
*/
rtems_status_code
rtems_capture_clear_trigger (rtems_name from_name,
rtems_id from_id,
rtems_name to_name,
rtems_id to_id,
rtems_capture_trigger_mode_t mode,
rtems_capture_trigger_t trigger)
{
rtems_capture_control_t* control;
uint32_t flags;
flags = rtems_capture_map_trigger (trigger);
if (mode == rtems_capture_to_any)
{
control = rtems_capture_find_control (from_name, from_id);
if (control == NULL)
{
if (from_id)
return RTEMS_INVALID_ID;
return RTEMS_INVALID_NAME;
}
control->from_triggers &= ~flags;
}
else
{
control = rtems_capture_find_control (to_name, to_id);
if (control == NULL)
{
if (to_id)
return RTEMS_INVALID_ID;
return RTEMS_INVALID_NAME;
}
if (mode == rtems_capture_from_any)
control->to_triggers &= ~flags;
else
{
bool done = false;
int i;
control->by_triggers &= ~flags;
for (i = 0; i < RTEMS_CAPTURE_TRIGGER_TASKS; i++)
{
if (rtems_capture_control_by_valid (control, i) &&
((control->by[i].name == from_name) ||
(control->by[i].id == from_id)))
{
control->by[i].trigger &= ~trigger;
if (control->by[i].trigger == 0)
control->by_valid &= ~RTEMS_CAPTURE_CONTROL_FROM_MASK (i);
done = true;
break;
}
}
if (!done)
{
if (from_id)
return RTEMS_INVALID_ID;
return RTEMS_INVALID_NAME;
}
}
}
return RTEMS_SUCCESSFUL;
}
static inline uint32_t rtems_capture_count_records( void* recs, size_t size )
{
rtems_capture_record_t* rec;
uint8_t* ptr = recs;
uint32_t rec_count = 0;
size_t byte_count = 0;
while (byte_count < size) {
rec = (rtems_capture_record_t*) ptr;
rec_count++;
_Assert( rec->size >= sizeof(*rec) );
ptr += rec->size;
byte_count += rec->size;
};
return rec_count;
}
/*
* This function reads a number of records from the capture buffer.
*
* The function returns the number of record that is has that are
* in a continous block of memory. If the number of available records
* wrap then only those records are provided. This removes the need for
* caller to be concerned about buffer wrappings. If the number of
* requested records cannot be met due to the wrapping of the records
* less than the specified number will be returned.
*
* The user must release the records. This is achieved with a call to
* rtems_capture_release. Calls this function without a release will
* result in at least the same number of records being released.
*/
rtems_status_code
rtems_capture_read (uint32_t cpu,
uint32_t* read,
rtems_capture_record_t** recs)
{
rtems_interrupt_lock_context lock_context;
rtems_status_code sc = RTEMS_SUCCESSFUL;
size_t recs_size = 0;
rtems_interrupt_lock* lock = &(capture_lock_on_cpu( cpu ));
rtems_capture_buffer_t* records = &(capture_records_on_cpu( cpu ));
uint32_t* flags = &(capture_flags_on_cpu( cpu ));
*read = 0;
*recs = NULL;
rtems_interrupt_lock_acquire (lock, &lock_context);
/*
* Only one reader is allowed.
*/
if (*flags & RTEMS_CAPTURE_READER_ACTIVE)
{
rtems_interrupt_lock_release (lock, &lock_context);
return RTEMS_RESOURCE_IN_USE;
}
if ( (capture_flags_global & RTEMS_CAPTURE_ON) != 0 )
{
rtems_interrupt_lock_release (lock, &lock_context);
return RTEMS_UNSATISFIED;
}
*flags |= RTEMS_CAPTURE_READER_ACTIVE;
*recs = rtems_capture_buffer_peek( records, &recs_size );
*read = rtems_capture_count_records( *recs, recs_size );
rtems_interrupt_lock_release (lock, &lock_context);
return sc;
}
/*
* This function releases the requested number of record slots back
* to the capture engine. The count must match the number read.
*/
rtems_status_code
rtems_capture_release (uint32_t cpu, uint32_t count)
{
rtems_interrupt_lock_context lock_context;
uint8_t* ptr;
rtems_capture_record_t* rec;
uint32_t counted;
size_t ptr_size = 0;
size_t rel_size = 0;
rtems_status_code ret_val = RTEMS_SUCCESSFUL;
rtems_interrupt_lock* lock = &(capture_lock_on_cpu( cpu ));
rtems_capture_buffer_t* records = &(capture_records_on_cpu( cpu ));
uint32_t* flags = &(capture_flags_on_cpu( cpu ));
uint32_t* total = &(capture_count_on_cpu( cpu ));
rtems_interrupt_lock_acquire (lock, &lock_context);
if (count > *total) {
count = *total;
}
if ( (capture_flags_global & RTEMS_CAPTURE_ON) != 0 ) {
rtems_interrupt_lock_release (lock, &lock_context);
return RTEMS_UNSATISFIED;
}
counted = count;
ptr = rtems_capture_buffer_peek( records, &ptr_size );
_Assert(ptr_size >= (count * sizeof(*rec) ));
rel_size = 0;
while (counted--) {
rec = (rtems_capture_record_t*) ptr;
rel_size += rec->size;
_Assert( rel_size <= ptr_size );
ptr += rec->size;
}
if (rel_size > ptr_size ) {
ret_val = RTEMS_INVALID_NUMBER;
rel_size = ptr_size;
}
*total -= count;
if (count) {
rtems_capture_buffer_free( records, rel_size );
}
*flags &= ~RTEMS_CAPTURE_READER_ACTIVE;
rtems_interrupt_lock_release (lock, &lock_context);
return ret_val;
}
/*
* This function returns the current time. If a handler is provided
* by the user get the time from that.
*/
void
rtems_capture_time (rtems_capture_time_t* uptime)
{
rtems_capture_get_time(uptime);
}
/*
* This function returns a string for an event based on the bit in the
* event. The functions takes the bit offset as a number not the bit
* set in a bit map.
*/
const char*
rtems_capture_event_text (int event)
{
if ((event < RTEMS_CAPTURE_EVENT_START) || (event > RTEMS_CAPTURE_EVENT_END))
return "invalid event id";
return capture_event_text[event - RTEMS_CAPTURE_EVENT_START];
}
/*
* This function returns the head of the list of control in the
* capture engine.
*/
rtems_capture_control_t*
rtems_capture_get_control_list (void)
{
return capture_controls;
}
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