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/*
* Copyright (C) 2010-2011, 2013-2014 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_osk.h"
#include "mali_osk_bitops.h"
#include "ump_kernel_common.h"
#include "ump_kernel_descriptor_mapping.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 ump_descriptor_table *descriptor_table_alloc(int count);
/**
* Free a descriptor table
* @param table The table to free
*/
static void descriptor_table_free(ump_descriptor_table *table);
ump_descriptor_mapping *ump_descriptor_mapping_create(int init_entries, int max_entries)
{
ump_descriptor_mapping *map = _mali_osk_calloc(1, sizeof(ump_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) {
map->lock = _mali_osk_mutex_rw_init(_MALI_OSK_LOCKFLAG_UNORDERED, 0);
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 ump_descriptor_mapping_destroy(ump_descriptor_mapping *map)
{
descriptor_table_free(map->table);
_mali_osk_mutex_rw_term(map->lock);
_mali_osk_free(map);
}
int ump_descriptor_mapping_allocate_mapping(ump_descriptor_mapping *map, void *target)
{
int descriptor = -1;/*-EFAULT;*/
_mali_osk_mutex_rw_wait(map->lock, _MALI_OSK_LOCKMODE_RW);
descriptor = _mali_osk_find_first_zero_bit(map->table->usage, map->current_nr_mappings);
if (descriptor == map->current_nr_mappings) {
int nr_mappings_new;
/* no free descriptor, try to expand the table */
ump_descriptor_table *new_table;
ump_descriptor_table *old_table = map->table;
nr_mappings_new = map->current_nr_mappings * 2;
if (map->current_nr_mappings >= map->max_nr_mappings_allowed) {
descriptor = -1;
goto unlock_and_exit;
}
new_table = descriptor_table_alloc(nr_mappings_new);
if (NULL == new_table) {
descriptor = -1;
goto unlock_and_exit;
}
_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;
map->current_nr_mappings = nr_mappings_new;
descriptor_table_free(old_table);
}
/* we have found a valid descriptor, set the value and usage bit */
_mali_osk_set_nonatomic_bit(descriptor, map->table->usage);
map->table->mappings[descriptor] = target;
unlock_and_exit:
_mali_osk_mutex_rw_signal(map->lock, _MALI_OSK_LOCKMODE_RW);
return descriptor;
}
int ump_descriptor_mapping_get(ump_descriptor_mapping *map, int descriptor, void **target)
{
int result = -1;/*-EFAULT;*/
DEBUG_ASSERT(map);
_mali_osk_mutex_rw_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 = 0;
} else *target = NULL;
_mali_osk_mutex_rw_signal(map->lock, _MALI_OSK_LOCKMODE_RO);
return result;
}
int ump_descriptor_mapping_set(ump_descriptor_mapping *map, int descriptor, void *target)
{
int result = -1;/*-EFAULT;*/
_mali_osk_mutex_rw_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 = 0;
}
_mali_osk_mutex_rw_signal(map->lock, _MALI_OSK_LOCKMODE_RO);
return result;
}
void ump_descriptor_mapping_free(ump_descriptor_mapping *map, int descriptor)
{
_mali_osk_mutex_rw_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_mutex_rw_signal(map->lock, _MALI_OSK_LOCKMODE_RW);
}
static ump_descriptor_table *descriptor_table_alloc(int count)
{
ump_descriptor_table *table;
table = _mali_osk_calloc(1, sizeof(ump_descriptor_table) + ((sizeof(unsigned long) * count) / BITS_PER_LONG) + (sizeof(void *) * count));
if (NULL != table) {
table->usage = (u32 *)((u8 *)table + sizeof(ump_descriptor_table));
table->mappings = (void **)((u8 *)table + sizeof(ump_descriptor_table) + ((sizeof(unsigned long) * count) / BITS_PER_LONG));
}
return table;
}
static void descriptor_table_free(ump_descriptor_table *table)
{
_mali_osk_free(table);
}
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