drivers/misc/mediatek/gpu/mt8127/mali/ump/common/ump_kernel_descriptor_mapping.c

   1 /*
   2  * This confidential and proprietary software may be used only as
   3  * authorised by a licensing agreement from ARM Limited
   4  * (C) COPYRIGHT 2008-2011, 2013 ARM Limited
   5  * ALL RIGHTS RESERVED
   6  * The entire notice above must be reproduced on all authorised
   7  * copies and copies may only be made to the extent permitted
   8  * by a licensing agreement from ARM Limited.
   9  */
  10
  11 #include "mali_kernel_common.h"
  12 #include "mali_osk.h"
  13 #include "mali_osk_bitops.h"
  14 #include "ump_kernel_common.h"
  15 #include "ump_kernel_descriptor_mapping.h"
  16
  17 #define MALI_PAD_INT(x) (((x) + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1))
  18
  19 /**
  20  * Allocate a descriptor table capable of holding 'count' mappings
  21  * @param count Number of mappings in the table
  22  * @return Pointer to a new table, NULL on error
  23  */
  24 static ump_descriptor_table * descriptor_table_alloc(int count);
  25
  26 /**
  27  * Free a descriptor table
  28  * @param table The table to free
  29  */
  30 static void descriptor_table_free(ump_descriptor_table * table);
  31
  32 ump_descriptor_mapping * ump_descriptor_mapping_create(int init_entries, int max_entries)
  33 {
  34         ump_descriptor_mapping * map = _mali_osk_calloc(1, sizeof(ump_descriptor_mapping) );
  35
  36         init_entries = MALI_PAD_INT(init_entries);
  37         max_entries = MALI_PAD_INT(max_entries);
  38
  39         if (NULL != map) {
  40                 map->table = descriptor_table_alloc(init_entries);
  41                 if (NULL != map->table) {
  42                         map->lock = _mali_osk_mutex_rw_init(_MALI_OSK_LOCKFLAG_UNORDERED, 0);
  43                         if ( NULL != map->lock ) {
  44                                 _mali_osk_set_nonatomic_bit(0, map->table->usage); /* reserve bit 0 to prevent NULL/zero logic to kick in */
  45                                 map->max_nr_mappings_allowed = max_entries;
  46                                 map->current_nr_mappings = init_entries;
  47                                 return map;
  48                         }
  49                         descriptor_table_free(map->table);
  50                 }
  51                 _mali_osk_free(map);
  52         }
  53         return NULL;
  54 }
  55
  56 void ump_descriptor_mapping_destroy(ump_descriptor_mapping * map)
  57 {
  58         descriptor_table_free(map->table);
  59         _mali_osk_mutex_rw_term(map->lock);
  60         _mali_osk_free(map);
  61 }
  62
  63 int ump_descriptor_mapping_allocate_mapping(ump_descriptor_mapping * map, void * target)
  64 {
  65         int descriptor = -1;/*-EFAULT;*/
  66         _mali_osk_mutex_rw_wait(map->lock, _MALI_OSK_LOCKMODE_RW);
  67         descriptor = _mali_osk_find_first_zero_bit(map->table->usage, map->current_nr_mappings);
  68         if (descriptor == map->current_nr_mappings) {
  69                 int nr_mappings_new;
  70                 /* no free descriptor, try to expand the table */
  71                 ump_descriptor_table * new_table;
  72                 ump_descriptor_table * old_table = map->table;
  73                 nr_mappings_new= map->current_nr_mappings *2;
  74
  75                 if (map->current_nr_mappings >= map->max_nr_mappings_allowed) {
  76                         descriptor = -1;
  77                         goto unlock_and_exit;
  78                 }
  79
  80                 new_table = descriptor_table_alloc(nr_mappings_new);
  81                 if (NULL == new_table) {
  82                         descriptor = -1;
  83                         goto unlock_and_exit;
  84                 }
  85
  86                 _mali_osk_memcpy(new_table->usage, old_table->usage, (sizeof(unsigned long)*map->current_nr_mappings) / BITS_PER_LONG);
  87                 _mali_osk_memcpy(new_table->mappings, old_table->mappings, map->current_nr_mappings * sizeof(void*));
  88                 map->table = new_table;
  89                 map->current_nr_mappings = nr_mappings_new;
  90                 descriptor_table_free(old_table);
  91         }
  92
  93         /* we have found a valid descriptor, set the value and usage bit */
  94         _mali_osk_set_nonatomic_bit(descriptor, map->table->usage);
  95         map->table->mappings[descriptor] = target;
  96
  97 unlock_and_exit:
  98         _mali_osk_mutex_rw_signal(map->lock, _MALI_OSK_LOCKMODE_RW);
  99         return descriptor;
 100 }
 101
 102 int ump_descriptor_mapping_get(ump_descriptor_mapping * map, int descriptor, void** target)
 103 {
 104         int result = -1;/*-EFAULT;*/
 105         DEBUG_ASSERT(map);
 106         _mali_osk_mutex_rw_wait(map->lock, _MALI_OSK_LOCKMODE_RO);
 107         if ((descriptor > 0) && (descriptor < map->current_nr_mappings) && _mali_osk_test_bit(descriptor, map->table->usage)) {
 108                 *target = map->table->mappings[descriptor];
 109                 result = 0;
 110         } else *target = NULL;
 111         _mali_osk_mutex_rw_signal(map->lock, _MALI_OSK_LOCKMODE_RO);
 112         return result;
 113 }
 114
 115 int ump_descriptor_mapping_set(ump_descriptor_mapping * map, int descriptor, void * target)
 116 {
 117         int result = -1;/*-EFAULT;*/
 118         _mali_osk_mutex_rw_wait(map->lock, _MALI_OSK_LOCKMODE_RO);
 119         if ((descriptor > 0) && (descriptor < map->current_nr_mappings) && _mali_osk_test_bit(descriptor, map->table->usage)) {
 120                 map->table->mappings[descriptor] = target;
 121                 result = 0;
 122         }
 123         _mali_osk_mutex_rw_signal(map->lock, _MALI_OSK_LOCKMODE_RO);
 124         return result;
 125 }
 126
 127 void ump_descriptor_mapping_free(ump_descriptor_mapping * map, int descriptor)
 128 {
 129         _mali_osk_mutex_rw_wait(map->lock, _MALI_OSK_LOCKMODE_RW);
 130         if ((descriptor > 0) && (descriptor < map->current_nr_mappings) && _mali_osk_test_bit(descriptor, map->table->usage)) {
 131                 map->table->mappings[descriptor] = NULL;
 132                 _mali_osk_clear_nonatomic_bit(descriptor, map->table->usage);
 133         }
 134         _mali_osk_mutex_rw_signal(map->lock, _MALI_OSK_LOCKMODE_RW);
 135 }
 136
 137 static ump_descriptor_table * descriptor_table_alloc(int count)
 138 {
 139         ump_descriptor_table * table;
 140
 141         table = _mali_osk_calloc(1, sizeof(ump_descriptor_table) + ((sizeof(unsigned long) * count)/BITS_PER_LONG) + (sizeof(void*) * count) );
 142
 143         if (NULL != table) {
 144                 table->usage = (u32*)((u8*)table + sizeof(ump_descriptor_table));
 145                 table->mappings = (void**)((u8*)table + sizeof(ump_descriptor_table) + ((sizeof(unsigned long) * count)/BITS_PER_LONG));
 146         }
 147
 148         return table;
 149 }
 150
 151 static void descriptor_table_free(ump_descriptor_table * table)
 152 {
 153         _mali_osk_free(table);
 154 }
 155