LXR linux/drivers/gpu/drm/radeon/radeon

   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#include "radeon_trace.h"
  33
  34int 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
  58bool 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
  75bool 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
  92void 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}
 107