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 <drm/drmP.h>
  31 #include "radeon.h"
  32
  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, true);
  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         *((uint64_t*)radeon_sa_bo_cpu_addr((*semaphore)->sa_bo)) = 0;
  53         return 0;
  54 }
  55
  56 void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
  57                                   struct radeon_semaphore *semaphore)
  58 {
  59         --semaphore->waiters;
  60         radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
  61 }
  62
  63 void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
  64                                 struct radeon_semaphore *semaphore)
  65 {
  66         ++semaphore->waiters;
  67         radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
  68 }
  69
  70 /* caller must hold ring lock */
  71 int radeon_semaphore_sync_rings(struct radeon_device *rdev,
  72                                 struct radeon_semaphore *semaphore,
  73                                 int signaler, int waiter)
  74 {
  75         int r;
  76
  77         /* no need to signal and wait on the same ring */
  78         if (signaler == waiter) {
  79                 return 0;
  80         }
  81
  82         /* prevent GPU deadlocks */
  83         if (!rdev->ring[signaler].ready) {
  84                 dev_err(rdev->dev, "Trying to sync to a disabled ring!");
  85                 return -EINVAL;
  86         }
  87
  88         r = radeon_ring_alloc(rdev, &rdev->ring[signaler], 8);
  89         if (r) {
  90                 return r;
  91         }
  92         radeon_semaphore_emit_signal(rdev, signaler, semaphore);
  93         radeon_ring_commit(rdev, &rdev->ring[signaler]);
  94
  95         /* we assume caller has already allocated space on waiters ring */
  96         radeon_semaphore_emit_wait(rdev, waiter, semaphore);
  97
  98         /* for debugging lockup only, used by sysfs debug files */
  99         rdev->ring[signaler].last_semaphore_signal_addr = semaphore->gpu_addr;
 100         rdev->ring[waiter].last_semaphore_wait_addr = semaphore->gpu_addr;
 101
 102         return 0;
 103 }
 104
 105 void radeon_semaphore_free(struct radeon_device *rdev,
 106                            struct radeon_semaphore **semaphore,
 107                            struct radeon_fence *fence)
 108 {
 109         if (semaphore == NULL || *semaphore == NULL) {
 110                 return;
 111         }
 112         if ((*semaphore)->waiters > 0) {
 113                 dev_err(rdev->dev, "semaphore %p has more waiters than signalers,"
 114                         " hardware lockup imminent!\n", *semaphore);
 115         }
 116         radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence);
 117         kfree(*semaphore);
 118         *semaphore = NULL;
 119 }