satip-axe/kernel/drivers/stm/mali/common/pmm/mali_pmm_state.c

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/*
* Copyright (C) 2010-2011 ARM Limited. All rights reserved.
*
* This program is free software and is provided to you under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
*
* A copy of the licence is included with the program, and can also be obtained from Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
/**
* @file mali_pmm_state.c
* Implementation of the power management module internal state
*/
#if USING_MALI_PMM
#include "mali_ukk.h"
#include "mali_kernel_common.h"
#include "mali_kernel_subsystem.h"
#include "mali_pmm.h"
#include "mali_pmm_state.h"
#include "mali_pmm_system.h"
#include "mali_kernel_core.h"
#include "mali_platform.h"
#define SIZEOF_CORES_LIST 6
/* NOTE: L2 *MUST* be first on the list so that it
* is correctly powered on first and powered off last
*/
static mali_pmm_core_id cores_list[] = { MALI_PMM_CORE_L2,
MALI_PMM_CORE_GP,
MALI_PMM_CORE_PP0,
MALI_PMM_CORE_PP1,
MALI_PMM_CORE_PP2,
MALI_PMM_CORE_PP3 };
void pmm_update_system_state( _mali_pmm_internal_state_t *pmm )
{
mali_pmm_state state;
MALI_DEBUG_ASSERT_POINTER(pmm);
if( pmm->cores_registered == 0 )
{
state = MALI_PMM_STATE_UNAVAILABLE;
}
else if( pmm->cores_powered == 0 )
{
state = MALI_PMM_STATE_SYSTEM_OFF;
}
else if( pmm->cores_powered == pmm->cores_registered )
{
state = MALI_PMM_STATE_SYSTEM_ON;
}
else
{
/* Some other state where not everything is on or off */
state = MALI_PMM_STATE_SYSTEM_TRANSITION;
}
#if MALI_PMM_TRACE
_mali_pmm_trace_state_change( pmm->state, state );
#endif
pmm->state = state;
}
mali_pmm_core_mask pmm_cores_from_event_data( _mali_pmm_internal_state_t *pmm, mali_pmm_message_t *event )
{
mali_pmm_core_mask cores;
MALI_DEBUG_ASSERT_POINTER(pmm);
MALI_DEBUG_ASSERT_POINTER(event);
switch( event->id )
{
case MALI_PMM_EVENT_OS_POWER_UP:
case MALI_PMM_EVENT_OS_POWER_DOWN:
/* All cores - the system */
cores = pmm->cores_registered;
break;
case MALI_PMM_EVENT_JOB_SCHEDULED:
case MALI_PMM_EVENT_JOB_QUEUED:
case MALI_PMM_EVENT_JOB_FINISHED:
case MALI_PMM_EVENT_INTERNAL_POWER_UP_ACK:
case MALI_PMM_EVENT_INTERNAL_POWER_DOWN_ACK:
/* Currently the main event data is only the cores
* for these messages
*/
cores = (mali_pmm_core_mask)event->data;
if( cores == MALI_PMM_CORE_SYSTEM )
{
cores = pmm->cores_registered;
}
else if( cores == MALI_PMM_CORE_PP_ALL )
{
/* Get the subset of registered PP cores */
cores = (pmm->cores_registered & MALI_PMM_CORE_PP_ALL);
}
MALI_PMM_DEBUG_ASSERT_CORES_SUBSET( pmm->cores_registered, cores );
break;
default:
/* Assume timeout messages - report cores still powered */
cores = pmm->cores_powered;
break;
}
return cores;
}
mali_pmm_core_mask pmm_cores_to_power_up( _mali_pmm_internal_state_t *pmm, mali_pmm_core_mask cores )
{
mali_pmm_core_mask cores_subset;
MALI_DEBUG_ASSERT_POINTER(pmm);
MALI_PMM_DEBUG_ASSERT_CORES_SUBSET( pmm->cores_registered, cores );
/* Check that cores aren't pending power down when asked for power up */
MALI_DEBUG_ASSERT( pmm->cores_pend_down == 0 );
cores_subset = (~(pmm->cores_powered) & cores);
if( cores_subset != 0 )
{
/* There are some cores that need powering up */
pmm->cores_pend_up = cores_subset;
}
return cores_subset;
}
mali_pmm_core_mask pmm_cores_to_power_down( _mali_pmm_internal_state_t *pmm, mali_pmm_core_mask cores, mali_bool immediate_only )
{
mali_pmm_core_mask cores_subset;
_mali_osk_errcode_t err;
MALI_DEBUG_ASSERT_POINTER(pmm);
MALI_PMM_DEBUG_ASSERT_CORES_SUBSET( pmm->cores_registered, cores );
/* Check that cores aren't pending power up when asked for power down */
MALI_DEBUG_ASSERT( pmm->cores_pend_up == 0 );
cores_subset = (pmm->cores_powered & cores);
if( cores_subset != 0 )
{
int n;
volatile mali_pmm_core_mask *ppowered = &(pmm->cores_powered);
/* There are some cores that need powering up, but we may
* need to wait until they are idle
*/
for( n = SIZEOF_CORES_LIST-1; n >= 0; n-- )
{
if( (cores_list[n] & cores_subset) != 0 )
{
/* Core is to be powered down */
pmm->cores_pend_down |= cores_list[n];
/* Can't hold the power lock, when acessing subsystem mutex via
* the core power call.
* Due to terminatation of driver requiring a subsystem mutex
* and then power lock held to unregister a core.
* This does mean that the following function could fail
* as the core is unregistered before we tell it to power
* down, but it does not matter as we are terminating
*/
#if MALI_STATE_TRACKING
pmm->mali_pmm_lock_acquired = 0;
#endif /* MALI_STATE_TRACKING */
MALI_PMM_UNLOCK(pmm);
/* Signal the core to power down
* If it is busy (not idle) it will set a pending power down flag
* (as long as we don't want to only immediately power down).
* If it isn't busy it will move out of the idle queue right
* away
*/
err = mali_core_signal_power_down( cores_list[n], immediate_only );
MALI_PMM_LOCK(pmm);
#if MALI_STATE_TRACKING
pmm->mali_pmm_lock_acquired = 1;
#endif /* MALI_STATE_TRACKING */
/* Re-read cores_subset in case it has changed */
cores_subset = (*ppowered & cores);
if( err == _MALI_OSK_ERR_OK )
{
/* We moved an idle core to the power down queue
* which means it is now acknowledged (if it is still
* registered)
*/
pmm->cores_ack_down |= (cores_list[n] & cores_subset);
}
else
{
MALI_DEBUG_ASSERT( err == _MALI_OSK_ERR_BUSY ||
(err == _MALI_OSK_ERR_FAULT &&
(*ppowered & cores_list[n]) == 0) );
/* If we didn't move a core - it must be active, so
* leave it pending, so we get an acknowledgement (when
* not in immediate only mode)
* Alternatively we are shutting down and the core has
* been unregistered
*/
}
}
}
}
return cores_subset;
}
void pmm_power_down_cancel( _mali_pmm_internal_state_t *pmm )
{
int n;
mali_pmm_core_mask pd, ad;
_mali_osk_errcode_t err;
volatile mali_pmm_core_mask *pregistered;
MALI_DEBUG_ASSERT_POINTER(pmm);
MALIPMM_DEBUG_PRINT( ("PMM: Cancelling power down\n") );
pd = pmm->cores_pend_down;
ad = pmm->cores_ack_down;
/* Clear the pending cores so that they don't move to the off
* queue if they haven't already
*/
pmm->cores_pend_down = 0;
pmm->cores_ack_down = 0;
pregistered = &(pmm->cores_registered);
/* Power up all the pending power down cores - just so
* we make sure the system is in a known state, as a
* pending core might have sent an acknowledged message
* which hasn't been read yet.
*/
for( n = 0; n < SIZEOF_CORES_LIST; n++ )
{
if( (cores_list[n] & pd) != 0 )
{
/* Can't hold the power lock, when acessing subsystem mutex via
* the core power call.
* Due to terminatation of driver requiring a subsystem mutex
* and then power lock held to unregister a core.
* This does mean that the following power up function could fail
* as the core is unregistered before we tell it to power
* up, but it does not matter as we are terminating
*/
#if MALI_STATE_TRACKING
pmm->mali_pmm_lock_acquired = 0;
#endif /* MALI_STATE_TRACKING */
MALI_PMM_UNLOCK(pmm);
/* As we are cancelling - only move the cores back to the queue -
* no reset needed
*/
err = mali_core_signal_power_up( cores_list[n], MALI_TRUE );
MALI_PMM_LOCK(pmm);
#if MALI_STATE_TRACKING
pmm->mali_pmm_lock_acquired = 1;
#endif /* MALI_STATE_TRACKING */
/* Update pending list with the current registered cores */
pd &= (*pregistered);
if( err != _MALI_OSK_ERR_OK )
{
MALI_DEBUG_ASSERT( (err == _MALI_OSK_ERR_BUSY &&
((cores_list[n] & ad) == 0)) ||
(err == _MALI_OSK_ERR_FAULT &&
(*pregistered & cores_list[n]) == 0) );
/* If we didn't power up a core - it must be active and
* hasn't actually tried to power down - this is expected
* for cores that haven't acknowledged
* Alternatively we are shutting down and the core has
* been unregistered
*/
}
}
}
/* Only used in debug builds */
MALI_IGNORE(ad);
}
mali_bool pmm_power_down_okay( _mali_pmm_internal_state_t *pmm )
{
MALI_DEBUG_ASSERT_POINTER(pmm);
return ( pmm->cores_pend_down == pmm->cores_ack_down ? MALI_TRUE : MALI_FALSE );
}
mali_bool pmm_invoke_power_down( _mali_pmm_internal_state_t *pmm )
{
_mali_osk_errcode_t err;
MALI_DEBUG_ASSERT_POINTER(pmm);
/* Check that cores are pending power down during power down invoke */
MALI_DEBUG_ASSERT( pmm->cores_pend_down != 0 );
/* Check that cores are not pending power up during power down invoke */
MALI_DEBUG_ASSERT( pmm->cores_pend_up == 0 );
if( !pmm_power_down_okay( pmm ) )
{
MALIPMM_DEBUG_PRINT( ("PMM: Waiting for cores to go idle for power off - 0x%08x / 0x%08x\n",
pmm->cores_pend_down, pmm->cores_ack_down) );
return MALI_FALSE;
}
else
{
#if !MALI_PMM_NO_PMU
err = mali_platform_powerdown( pmm->cores_pend_down );
#else
err = _MALI_OSK_ERR_OK;
#endif
if( err == _MALI_OSK_ERR_OK )
{
#if MALI_PMM_TRACE
mali_pmm_core_mask old_power = pmm->cores_powered;
#endif
/* Remove powered down cores from idle and powered list */
pmm->cores_powered &= ~(pmm->cores_pend_down);
pmm->cores_idle &= ~(pmm->cores_pend_down);
/* Reset pending/acknowledged status */
pmm->cores_pend_down = 0;
pmm->cores_ack_down = 0;
#if MALI_PMM_TRACE
_mali_pmm_trace_hardware_change( old_power, pmm->cores_powered );
#endif
}
else
{
MALI_PRINT_ERROR( ("PMM: Failed to get PMU to power down cores - (0x%x) %s",
pmm->cores_pend_down, pmm_trace_get_core_name(pmm->cores_pend_down)) );
pmm->fatal_power_err = MALI_TRUE;
}
}
return MALI_TRUE;
}
mali_bool pmm_power_up_okay( _mali_pmm_internal_state_t *pmm )
{
MALI_DEBUG_ASSERT_POINTER(pmm);
return ( pmm->cores_pend_up == pmm->cores_ack_up ? MALI_TRUE : MALI_FALSE );
}
mali_bool pmm_invoke_power_up( _mali_pmm_internal_state_t *pmm )
{
_mali_osk_errcode_t err;
MALI_DEBUG_ASSERT_POINTER(pmm);
/* Check that cores are pending power up during power up invoke */
MALI_DEBUG_ASSERT( pmm->cores_pend_up != 0 );
/* Check that cores are not pending power down during power up invoke */
MALI_DEBUG_ASSERT( pmm->cores_pend_down == 0 );
if( pmm_power_up_okay( pmm ) )
{
/* Power up has completed - sort out subsystem core status */
int n;
/* Use volatile to access, so that it is updated if any cores are unregistered */
volatile mali_pmm_core_mask *ppendup = &(pmm->cores_pend_up);
#if MALI_PMM_TRACE
mali_pmm_core_mask old_power = pmm->cores_powered;
#endif
/* Move cores into idle queues */
for( n = 0; n < SIZEOF_CORES_LIST; n++ )
{
if( (cores_list[n] & (*ppendup)) != 0 )
{
/* Can't hold the power lock, when acessing subsystem mutex via
* the core power call.
* Due to terminatation of driver requiring a subsystem mutex
* and then power lock held to unregister a core.
* This does mean that the following function could fail
* as the core is unregistered before we tell it to power
* up, but it does not matter as we are terminating
*/
#if MALI_STATE_TRACKING
pmm->mali_pmm_lock_acquired = 0;
#endif /* MALI_STATE_TRACKING */
MALI_PMM_UNLOCK(pmm);
err = mali_core_signal_power_up( cores_list[n], MALI_FALSE );
MALI_PMM_LOCK(pmm);
#if MALI_STATE_TRACKING
pmm->mali_pmm_lock_acquired = 1;
#endif /* MALI_STATE_TRACKING */
if( err != _MALI_OSK_ERR_OK )
{
MALI_DEBUG_ASSERT( (err == _MALI_OSK_ERR_FAULT &&
(*ppendup & cores_list[n]) == 0) );
/* We only expect this to fail when we are shutting down
* and the core has been unregistered
*/
}
}
}
/* Finished power up - add cores to idle and powered list */
pmm->cores_powered |= (*ppendup);
pmm->cores_idle |= (*ppendup);
/* Reset pending/acknowledge status */
pmm->cores_pend_up = 0;
pmm->cores_ack_up = 0;
#if MALI_PMM_TRACE
_mali_pmm_trace_hardware_change( old_power, pmm->cores_powered );
#endif
return MALI_TRUE;
}
else
{
#if !MALI_PMM_NO_PMU
/* Power up must now be done */
err = mali_platform_powerup( pmm->cores_pend_up );
#else
err = _MALI_OSK_ERR_OK;
#endif
if( err != _MALI_OSK_ERR_OK )
{
MALI_PRINT_ERROR( ("PMM: Failed to get PMU to power up cores - (0x%x) %s",
pmm->cores_pend_up, pmm_trace_get_core_name(pmm->cores_pend_up)) );
pmm->fatal_power_err = MALI_TRUE;
}
else
{
/* TBD - Update core status immediately rather than use event message */
_mali_uk_pmm_message_s event = {
NULL,
MALI_PMM_EVENT_INTERNAL_POWER_UP_ACK,
0 };
/* All the cores that were pending power up, have now completed power up */
event.data = pmm->cores_pend_up;
_mali_ukk_pmm_event_message( &event );
MALIPMM_DEBUG_PRINT( ("PMM: Sending ACK to power up") );
}
}
/* Always return false, as we need an interrupt to acknowledge
* when power up is complete
*/
return MALI_FALSE;
}
mali_pmm_core_mask pmm_cores_set_active( _mali_pmm_internal_state_t *pmm, mali_pmm_core_mask cores )
{
MALI_DEBUG_ASSERT_POINTER(pmm);
MALI_PMM_DEBUG_ASSERT_CORES_SUBSET( pmm->cores_registered, cores );
pmm->cores_idle &= (~cores);
return pmm->cores_idle;
}
mali_pmm_core_mask pmm_cores_set_idle( _mali_pmm_internal_state_t *pmm, mali_pmm_core_mask cores )
{
MALI_DEBUG_ASSERT_POINTER(pmm);
MALI_PMM_DEBUG_ASSERT_CORES_SUBSET( pmm->cores_registered, cores );
pmm->cores_idle |= (cores);
return pmm->cores_idle;
}
mali_pmm_core_mask pmm_cores_set_down_ack( _mali_pmm_internal_state_t *pmm, mali_pmm_core_mask cores )
{
MALI_DEBUG_ASSERT_POINTER(pmm);
MALI_PMM_DEBUG_ASSERT_CORES_SUBSET( pmm->cores_registered, cores );
/* Check core is not pending a power down */
MALI_DEBUG_ASSERT( (pmm->cores_pend_down & cores) != 0 );
/* Check core has not acknowledged power down more than once */
MALI_DEBUG_ASSERT( (pmm->cores_ack_down & cores) == 0 );
pmm->cores_ack_down |= (cores);
return pmm->cores_ack_down;
}
void pmm_fatal_reset( _mali_pmm_internal_state_t *pmm )
{
_mali_osk_errcode_t err = _MALI_OSK_ERR_OK;
_mali_osk_notification_t *msg = NULL;
mali_pmm_status status;
MALI_DEBUG_ASSERT_POINTER(pmm);
MALIPMM_DEBUG_PRINT( ("PMM: Fatal Reset called") );
MALI_DEBUG_ASSERT( pmm->status != MALI_PMM_STATUS_OFF );
/* Reset the common status */
pmm->waiting = 0;
pmm->missed = 0;
pmm->fatal_power_err = MALI_FALSE;
pmm->no_events = 0;
pmm->check_policy = MALI_FALSE;
pmm->cores_pend_down = 0;
pmm->cores_pend_up = 0;
pmm->cores_ack_down = 0;
pmm->cores_ack_up = 0;
pmm->is_dvfs_active = 0;
#if MALI_PMM_TRACE
pmm->messages_sent = 0;
pmm->messages_received = 0;
pmm->imessages_sent = 0;
pmm->imessages_received = 0;
MALI_PRINT( ("PMM Trace: *** Fatal reset occurred ***") );
#endif
/* Set that we are unavailable whilst resetting */
pmm->state = MALI_PMM_STATE_UNAVAILABLE;
status = pmm->status;
pmm->status = MALI_PMM_STATUS_OFF;
/* We want all cores powered */
pmm->cores_powered = pmm->cores_registered;
/* The cores may not be idle, but this state will be rectified later */
pmm->cores_idle = pmm->cores_registered;
/* So power on any cores that are registered */
if( pmm->cores_registered != 0 )
{
int n;
volatile mali_pmm_core_mask *pregistered = &(pmm->cores_registered);
#if !MALI_PMM_NO_PMU
err = mali_platform_powerup( pmm->cores_registered );
#endif
if( err != _MALI_OSK_ERR_OK )
{
/* This is very bad as we can't even be certain the cores are now
* powered up
*/
MALI_PRINT_ERROR( ("PMM: Failed to perform PMM reset!\n") );
/* TBD driver exit? */
}
for( n = SIZEOF_CORES_LIST-1; n >= 0; n-- )
{
if( (cores_list[n] & (*pregistered)) != 0 )
{
#if MALI_STATE_TRACKING
pmm->mali_pmm_lock_acquired = 0;
#endif /* MALI_STATE_TRACKING */
MALI_PMM_UNLOCK(pmm);
/* Core is now active - so try putting it in the idle queue */
err = mali_core_signal_power_up( cores_list[n], MALI_FALSE );
MALI_PMM_LOCK(pmm);
#if MALI_STATE_TRACKING
pmm->mali_pmm_lock_acquired = 1;
#endif /* MALI_STATE_TRACKING */
/* We either succeeded, or we were not off anyway, or we have
* just be deregistered
*/
MALI_DEBUG_ASSERT( (err == _MALI_OSK_ERR_OK) ||
(err == _MALI_OSK_ERR_BUSY) ||
(err == _MALI_OSK_ERR_FAULT &&
(*pregistered & cores_list[n]) == 0) );
}
}
}
/* Unblock any pending OS event */
if( status == MALI_PMM_STATUS_OS_POWER_UP )
{
/* Get the OS data and respond to the power up */
_mali_osk_pmm_power_up_done( pmm_retrieve_os_event_data( pmm ) );
}
if( status == MALI_PMM_STATUS_OS_POWER_DOWN )
{
/* Get the OS data and respond to the power down
* NOTE: We are not powered down at this point due to power problems,
* so we are lying to the system, but something bad has already
* happened and we are trying unstick things
* TBD - Add busy loop to power down cores?
*/
_mali_osk_pmm_power_down_done( pmm_retrieve_os_event_data( pmm ) );
}
/* Purge the event queues */
do
{
if( _mali_osk_notification_queue_dequeue( pmm->iqueue, &msg ) == _MALI_OSK_ERR_OK )
{
_mali_osk_notification_delete ( msg );
break;
}
} while (MALI_TRUE);
do
{
if( _mali_osk_notification_queue_dequeue( pmm->queue, &msg ) == _MALI_OSK_ERR_OK )
{
_mali_osk_notification_delete ( msg );
break;
}
} while (MALI_TRUE);
/* Return status/state to normal */
pmm->status = MALI_PMM_STATUS_IDLE;
pmm_update_system_state(pmm);
}
mali_pmm_core_mask pmm_cores_set_up_ack( _mali_pmm_internal_state_t *pmm, mali_pmm_core_mask cores )
{
MALI_DEBUG_ASSERT_POINTER(pmm);
MALI_PMM_DEBUG_ASSERT_CORES_SUBSET( pmm->cores_registered, cores );
/* Check core is not pending a power up */
MALI_DEBUG_ASSERT( (pmm->cores_pend_up & cores) != 0 );
/* Check core has not acknowledged power up more than once */
MALI_DEBUG_ASSERT( (pmm->cores_ack_up & cores) == 0 );
pmm->cores_ack_up |= (cores);
return pmm->cores_ack_up;
}
void pmm_save_os_event_data(_mali_pmm_internal_state_t *pmm, mali_pmm_message_data data)
{
MALI_DEBUG_ASSERT_POINTER(pmm);
/* Check that there is no saved data */
MALI_DEBUG_ASSERT( pmm->os_data == 0 );
/* Can't store zero data - as retrieve check will fail */
MALI_DEBUG_ASSERT( data != 0 );
pmm->os_data = data;
}
mali_pmm_message_data pmm_retrieve_os_event_data(_mali_pmm_internal_state_t *pmm)
{
mali_pmm_message_data data;
MALI_DEBUG_ASSERT_POINTER(pmm);
/* Check that there is saved data */
MALI_DEBUG_ASSERT( pmm->os_data != 0 );
/* Get data, and clear the saved version */
data = pmm->os_data;
pmm->os_data = 0;
return data;
}
/* Create list of core names to look up
* We are doing it this way to overcome the need for
* either string allocation, or stack space, so we
* use constant strings instead
*/
typedef struct pmm_trace_corelist
{
mali_pmm_core_mask id;
const char *name;
} pmm_trace_corelist_t;
static pmm_trace_corelist_t pmm_trace_cores[] = {
{ MALI_PMM_CORE_SYSTEM, "SYSTEM" },
{ MALI_PMM_CORE_GP, "GP" },
{ MALI_PMM_CORE_L2, "L2" },
{ MALI_PMM_CORE_PP0, "PP0" },
{ MALI_PMM_CORE_PP1, "PP1" },
{ MALI_PMM_CORE_PP2, "PP2" },
{ MALI_PMM_CORE_PP3, "PP3" },
{ MALI_PMM_CORE_PP_ALL, "PP (all)" },
{ (MALI_PMM_CORE_GP | MALI_PMM_CORE_L2 | MALI_PMM_CORE_PP0),
"GP+L2+PP0" },
{ (MALI_PMM_CORE_GP | MALI_PMM_CORE_PP0),
"GP+PP0" },
{ (MALI_PMM_CORE_GP | MALI_PMM_CORE_L2 | MALI_PMM_CORE_PP0 | MALI_PMM_CORE_PP1),
"GP+L2+PP0+PP1" },
{ (MALI_PMM_CORE_GP | MALI_PMM_CORE_PP0 | MALI_PMM_CORE_PP1),
"GP+PP0+PP1" },
{ 0, NULL } /* Terminator of list */
};
const char *pmm_trace_get_core_name( mali_pmm_core_mask cores )
{
const char *dname = NULL;
int cl;
/* Look up name in corelist */
cl = 0;
while( pmm_trace_cores[cl].name != NULL )
{
if( pmm_trace_cores[cl].id == cores )
{
dname = pmm_trace_cores[cl].name;
break;
}
cl++;
}
if( dname == NULL )
{
/* We don't know a good short-hand for the configuration */
dname = "[multi-core]";
}
return dname;
}
#endif /* USING_MALI_PMM */