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
  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, 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
  56void 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
  63void 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 */
  71int 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
 105void 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}
 120