root/drivers/gpu/drm/radeon/radeon_semaphore.c

DEFINITIONS

1. radeon_semaphore_create
2. radeon_semaphore_emit_signal
3. radeon_semaphore_emit_wait
4. radeon_semaphore_free

   1 /*
   2  * Copyright 2011 Christian König.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sub license, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  16  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  17  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  18  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  19  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  *
  21  * The above copyright notice and this permission notice (including the
  22  * next paragraph) shall be included in all copies or substantial portions
  23  * of the Software.
  24  *
  25  */
  26 /*
  27  * Authors:
  28  *    Christian König <deathsimple@vodafone.de>
  29  */
  30 
  31 #include "radeon.h"
  32 #include "radeon_trace.h"
  33 
  34 int radeon_semaphore_create(struct radeon_device *rdev,
  35                             struct radeon_semaphore **semaphore)
  36 {
  37         int r;
  38 
  39         *semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
  40         if (*semaphore == NULL) {
  41                 return -ENOMEM;
  42         }
  43         r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
  44                              &(*semaphore)->sa_bo, 8, 8);
  45         if (r) {
  46                 kfree(*semaphore);
  47                 *semaphore = NULL;
  48                 return r;
  49         }
  50         (*semaphore)->waiters = 0;
  51         (*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
  52 
  53         *((uint64_t *)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
  54 
  55         return 0;
  56 }
  57 
  58 bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx,
  59                                   struct radeon_semaphore *semaphore)
  60 {
  61         struct radeon_ring *ring = &rdev->ring[ridx];
  62 
  63         trace_radeon_semaphore_signale(ridx, semaphore);
  64 
  65         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) {
  66                 --semaphore->waiters;
  67 
  68                 /* for debugging lockup only, used by sysfs debug files */
  69                 ring->last_semaphore_signal_addr = semaphore->gpu_addr;
  70                 return true;
  71         }
  72         return false;
  73 }
  74 
  75 bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx,
  76                                 struct radeon_semaphore *semaphore)
  77 {
  78         struct radeon_ring *ring = &rdev->ring[ridx];
  79 
  80         trace_radeon_semaphore_wait(ridx, semaphore);
  81 
  82         if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) {
  83                 ++semaphore->waiters;
  84 
  85                 /* for debugging lockup only, used by sysfs debug files */
  86                 ring->last_semaphore_wait_addr = semaphore->gpu_addr;
  87                 return true;
  88         }
  89         return false;
  90 }
  91 
  92 void radeon_semaphore_free(struct radeon_device *rdev,
  93                            struct radeon_semaphore **semaphore,
  94                            struct radeon_fence *fence)
  95 {
  96         if (semaphore == NULL || *semaphore == NULL) {
  97                 return;
  98         }
  99         if ((*semaphore)->waiters > 0) {
 100                 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
 101                         " hardware lockup imminent!\n", *semaphore);
 102         }
 103         radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
 104         kfree(*semaphore);
 105         *semaphore = NULL;
 106 }