drivers/gpu/drm/radeon/radeon_semaphore.c

   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 #include "drmP.h"
  31 #include "drm.h"
  32 #include "radeon.h"
  33
  34
  35 int radeon_semaphore_create(struct radeon_device *rdev,
  36                             struct radeon_semaphore **semaphore)
  37 {
  38         int r;
  39
  40         *semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
  41         if (*semaphore == NULL) {
  42                 return -ENOMEM;
  43         }
  44         r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo,
  45                              &(*semaphore)->sa_bo, 8, 8, true);
  46         if (r) {
  47                 kfree(*semaphore);
  48                 *semaphore = NULL;
  49                 return r;
  50         }
  51         (*semaphore)->waiters = 0;
  52         (*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo);
  53         *((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
  54         return 0;
  55 }
  56
  57 void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
  58                                   struct radeon_semaphore *semaphore)
  59 {
  60         --semaphore->waiters;
  61         radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
  62 }
  63
  64 void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
  65                                 struct radeon_semaphore *semaphore)
  66 {
  67         ++semaphore->waiters;
  68         radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
  69 }
  70
  71 /* caller must hold ring lock */
  72 int radeon_semaphore_sync_rings(struct radeon_device *rdev,
  73                                 struct radeon_semaphore *semaphore,
  74                                 int signaler, int waiter)
  75 {
  76         int r;
  77
  78         /* no need to signal and wait on the same ring */
  79         if (signaler == waiter) {
  80                 return 0;
  81         }
  82
  83         /* prevent GPU deadlocks */
  84         if (!rdev->ring[signaler].ready) {
  85                 dev_err(rdev->dev, "Trying to sync to a disabled ring!");
  86                 return -EINVAL;
  87         }
  88
  89         r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
  90         if (r) {
  91                 return r;
  92         }
  93         radeon_semaphore_emit_signal(rdev, signaler, semaphore);
  94         radeon_ring_commit(rdev, &rdev->ring[signaler]);
  95
  96         /* we assume caller has already allocated space on waiters ring */
  97         radeon_semaphore_emit_wait(rdev, waiter, semaphore);
  98
  99         return 0;
 100 }
 101
 102 void radeon_semaphore_free(struct radeon_device *rdev,
 103                            struct radeon_semaphore **semaphore,
 104                            struct radeon_fence *fence)
 105 {
 106         if (semaphore == NULL || *semaphore == NULL) {
 107                 return;
 108         }
 109         if ((*semaphore)->waiters > 0) {
 110                 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
 111                         " hardware lockup imminent!\n", *semaphore);
 112         }
 113         radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
 114         kfree(*semaphore);
 115         *semaphore = NULL;
 116 }