drivers/gpu/arm/mali400/r4p0_rel0/common/mali_spinlock_reentrant.c

   1 /*
   2  * Copyright (C) 2010-2012 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
  16 struct 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
  34 void 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
  46 void 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
  65 void 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 }