LXR linux/drivers/staging/mali/DX910-SW-99002-r5p2-00rel0/driver/src/devicedrv/mali/common/mali_spinlock

   1/*
   2 * Copyright (C) 2013, 2015 ARM Limited. All rights reserved.
   3 * 
   4 * This program is free software and is provided to you under the terms of the GNU General Public License version 2
   5 * as published by the Free Software Foundation, and any use by you of this program is subject to the terms of such GNU licence.
   6 * 
   7 * A copy of the licence is included with the program, and can also be obtained from Free Software
   8 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   9 */
  10
  11#include "mali_spinlock_reentrant.h"
  12
  13#include "mali_osk.h"
  14#include "mali_kernel_common.h"
  15
  16struct mali_spinlock_reentrant *mali_spinlock_reentrant_init(_mali_osk_lock_order_t lock_order)
  17{
  18        struct mali_spinlock_reentrant *spinlock;
  19
  20        spinlock = _mali_osk_calloc(1, sizeof(struct mali_spinlock_reentrant));
  21        if (NULL == spinlock) {
  22                return NULL;
  23        }
  24
  25        spinlock->lock = _mali_osk_spinlock_irq_init(_MALI_OSK_LOCKFLAG_ORDERED, lock_order);
  26        if (NULL == spinlock->lock) {
  27                mali_spinlock_reentrant_term(spinlock);
  28                return NULL;
  29        }
  30
  31        return spinlock;
  32}
  33
  34void mali_spinlock_reentrant_term(struct mali_spinlock_reentrant *spinlock)
  35{
  36        MALI_DEBUG_ASSERT_POINTER(spinlock);
  37        MALI_DEBUG_ASSERT(0 == spinlock->counter && 0 == spinlock->owner);
  38
  39        if (NULL != spinlock->lock) {
  40                _mali_osk_spinlock_irq_term(spinlock->lock);
  41        }
  42
  43        _mali_osk_free(spinlock);
  44}
  45
  46void mali_spinlock_reentrant_wait(struct mali_spinlock_reentrant *spinlock, u32 tid)
  47{
  48        MALI_DEBUG_ASSERT_POINTER(spinlock);
  49        MALI_DEBUG_ASSERT_POINTER(spinlock->lock);
  50        MALI_DEBUG_ASSERT(0 != tid);
  51
  52        MALI_DEBUG_PRINT(5, ("%s ^\n", __FUNCTION__));
  53
  54        if (tid != spinlock->owner) {
  55                _mali_osk_spinlock_irq_lock(spinlock->lock);
  56                MALI_DEBUG_ASSERT(0 == spinlock->owner && 0 == spinlock->counter);
  57                spinlock->owner = tid;
  58        }
  59
  60        MALI_DEBUG_PRINT(5, ("%s v\n", __FUNCTION__));
  61
  62        ++spinlock->counter;
  63}
  64
  65void mali_spinlock_reentrant_signal(struct mali_spinlock_reentrant *spinlock, u32 tid)
  66{
  67        MALI_DEBUG_ASSERT_POINTER(spinlock);
  68        MALI_DEBUG_ASSERT_POINTER(spinlock->lock);
  69        MALI_DEBUG_ASSERT(0 != tid && tid == spinlock->owner);
  70
  71        --spinlock->counter;
  72        if (0 == spinlock->counter) {
  73                spinlock->owner = 0;
  74                MALI_DEBUG_PRINT(5, ("%s release last\n", __FUNCTION__));
  75                _mali_osk_spinlock_irq_unlock(spinlock->lock);
  76        }
  77}
  78