Skip to content
Find file
Fetching contributors…
Cannot retrieve contributors at this time
184 lines (157 sloc) 6.36 KB
/*
* Copyright (C) 2010 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.
*/
#include "mali_kernel_common.h"
#include "mali_kernel_descriptor_mapping.h"
#include "mali_osk.h"
#include "mali_osk_bitops.h"
#define MALI_PAD_INT(x) (((x) + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1))
/**
* Allocate a descriptor table capable of holding 'count' mappings
* @param count Number of mappings in the table
* @return Pointer to a new table, NULL on error
*/
static mali_descriptor_table * descriptor_table_alloc(int count);
/**
* Free a descriptor table
* @param table The table to free
*/
static void descriptor_table_free(mali_descriptor_table * table);
mali_descriptor_mapping * mali_descriptor_mapping_create(int init_entries, int max_entries)
{
mali_descriptor_mapping * map = _mali_osk_calloc(1, sizeof(mali_descriptor_mapping));
init_entries = MALI_PAD_INT(init_entries);
max_entries = MALI_PAD_INT(max_entries);
if (NULL != map)
{
map->table = descriptor_table_alloc(init_entries);
if (NULL != map->table)
{
#if !USING_MMU
map->lock = _mali_osk_lock_init( (_mali_osk_lock_flags_t)(_MALI_OSK_LOCKFLAG_ORDERED | _MALI_OSK_LOCKFLAG_READERWRITER | _MALI_OSK_LOCKFLAG_NONINTERRUPTABLE), 0, 20);
#else
map->lock = _mali_osk_lock_init( (_mali_osk_lock_flags_t)(_MALI_OSK_LOCKFLAG_ORDERED | _MALI_OSK_LOCKFLAG_READERWRITER | _MALI_OSK_LOCKFLAG_NONINTERRUPTABLE), 0, 116);
#endif
if (NULL != map->lock)
{
_mali_osk_set_nonatomic_bit(0, map->table->usage); /* reserve bit 0 to prevent NULL/zero logic to kick in */
map->max_nr_mappings_allowed = max_entries;
map->current_nr_mappings = init_entries;
return map;
}
descriptor_table_free(map->table);
}
_mali_osk_free(map);
}
return NULL;
}
void mali_descriptor_mapping_destroy(mali_descriptor_mapping * map)
{
descriptor_table_free(map->table);
_mali_osk_lock_term(map->lock);
_mali_osk_free(map);
}
_mali_osk_errcode_t mali_descriptor_mapping_allocate_mapping(mali_descriptor_mapping * map, void * target, int *odescriptor)
{
_mali_osk_errcode_t err = _MALI_OSK_ERR_FAULT;
int new_descriptor;
MALI_DEBUG_ASSERT_POINTER(map);
MALI_DEBUG_ASSERT_POINTER(odescriptor);
_mali_osk_lock_wait(map->lock, _MALI_OSK_LOCKMODE_RW);
new_descriptor = _mali_osk_find_first_zero_bit(map->table->usage, map->current_nr_mappings);
if (new_descriptor == map->current_nr_mappings)
{
/* no free descriptor, try to expand the table */
mali_descriptor_table * new_table, * old_table;
if (map->current_nr_mappings >= map->max_nr_mappings_allowed) goto unlock_and_exit;
map->current_nr_mappings += BITS_PER_LONG;
new_table = descriptor_table_alloc(map->current_nr_mappings);
if (NULL == new_table) goto unlock_and_exit;
old_table = map->table;
_mali_osk_memcpy(new_table->usage, old_table->usage, (sizeof(unsigned long)*map->current_nr_mappings) / BITS_PER_LONG);
_mali_osk_memcpy(new_table->mappings, old_table->mappings, map->current_nr_mappings * sizeof(void*));
map->table = new_table;
descriptor_table_free(old_table);
}
/* we have found a valid descriptor, set the value and usage bit */
_mali_osk_set_nonatomic_bit(new_descriptor, map->table->usage);
map->table->mappings[new_descriptor] = target;
*odescriptor = new_descriptor;
err = _MALI_OSK_ERR_OK;
unlock_and_exit:
_mali_osk_lock_signal(map->lock, _MALI_OSK_LOCKMODE_RW);
MALI_ERROR(err);
}
void mali_descriptor_mapping_call_for_each(mali_descriptor_mapping * map, void (*callback)(int, void*))
{
int i;
MALI_DEBUG_ASSERT_POINTER(map);
MALI_DEBUG_ASSERT_POINTER(callback);
_mali_osk_lock_wait(map->lock, _MALI_OSK_LOCKMODE_RO);
/* id 0 is skipped as it's an reserved ID not mapping to anything */
for (i = 1; i < map->current_nr_mappings; ++i)
{
if (_mali_osk_test_bit(i, map->table->usage))
{
callback(i, map->table->mappings[i]);
}
}
_mali_osk_lock_signal(map->lock, _MALI_OSK_LOCKMODE_RO);
}
_mali_osk_errcode_t mali_descriptor_mapping_get(mali_descriptor_mapping * map, int descriptor, void** target)
{
_mali_osk_errcode_t result = _MALI_OSK_ERR_FAULT;
MALI_DEBUG_ASSERT_POINTER(map);
_mali_osk_lock_wait(map->lock, _MALI_OSK_LOCKMODE_RO);
if ( (descriptor >= 0) && (descriptor < map->current_nr_mappings) && _mali_osk_test_bit(descriptor, map->table->usage) )
{
*target = map->table->mappings[descriptor];
result = _MALI_OSK_ERR_OK;
}
else *target = NULL;
_mali_osk_lock_signal(map->lock, _MALI_OSK_LOCKMODE_RO);
MALI_ERROR(result);
}
_mali_osk_errcode_t mali_descriptor_mapping_set(mali_descriptor_mapping * map, int descriptor, void * target)
{
_mali_osk_errcode_t result = _MALI_OSK_ERR_FAULT;
_mali_osk_lock_wait(map->lock, _MALI_OSK_LOCKMODE_RO);
if ( (descriptor >= 0) && (descriptor < map->current_nr_mappings) && _mali_osk_test_bit(descriptor, map->table->usage) )
{
map->table->mappings[descriptor] = target;
result = _MALI_OSK_ERR_OK;
}
_mali_osk_lock_signal(map->lock, _MALI_OSK_LOCKMODE_RO);
MALI_ERROR(result);
}
void mali_descriptor_mapping_free(mali_descriptor_mapping * map, int descriptor)
{
_mali_osk_lock_wait(map->lock, _MALI_OSK_LOCKMODE_RW);
if ( (descriptor >= 0) && (descriptor < map->current_nr_mappings) && _mali_osk_test_bit(descriptor, map->table->usage) )
{
map->table->mappings[descriptor] = NULL;
_mali_osk_clear_nonatomic_bit(descriptor, map->table->usage);
}
_mali_osk_lock_signal(map->lock, _MALI_OSK_LOCKMODE_RW);
}
static mali_descriptor_table * descriptor_table_alloc(int count)
{
mali_descriptor_table * table;
table = _mali_osk_calloc(1, sizeof(mali_descriptor_table) + ((sizeof(unsigned long) * count)/BITS_PER_LONG) + (sizeof(void*) * count));
if (NULL != table)
{
table->usage = (u32*)((u8*)table + sizeof(mali_descriptor_table));
table->mappings = (void**)((u8*)table + sizeof(mali_descriptor_table) + ((sizeof(unsigned long) * count)/BITS_PER_LONG));
}
return table;
}
static void descriptor_table_free(mali_descriptor_table * table)
{
_mali_osk_free(table);
}
Something went wrong with that request. Please try again.