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 static int allocate_semaphores(struct radeon_device *rdev)
  35 {
  36         const unsigned long bo_size = PAGE_SIZE * 4;
  37
  38         struct radeon_bo *bo;
  39         struct list_head new_entrys;
  40         unsigned long irq_flags;
  41         uint64_t gpu_addr;
  42         void *map;
  43         int i, r;
  44
  45         r = radeon_bo_create(rdev, bo_size, RADEON_GPU_PAGE_SIZE, true,
  46                              RADEON_GEM_DOMAIN_GTT, &bo);
  47         if (r) {
  48                 dev_err(rdev->dev, "(%d) failed to allocate semaphore bo\n", r);
  49                 return r;
  50         }
  51
  52         r = radeon_bo_reserve(bo, false);
  53         if (r) {
  54                 radeon_bo_unref(&bo);
  55                 dev_err(rdev->dev, "(%d) failed to reserve semaphore bo\n", r);
  56                 return r;
  57         }
  58
  59         r = radeon_bo_kmap(bo, &map);
  60         if (r) {
  61                 radeon_bo_unreserve(bo);
  62                 radeon_bo_unref(&bo);
  63                 dev_err(rdev->dev, "(%d) semaphore map failed\n", r);
  64                 return r;
  65         }
  66         memset(map, 0, bo_size);
  67         radeon_bo_kunmap(bo);
  68
  69         r = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_VRAM, &gpu_addr);
  70         if (r) {
  71                 radeon_bo_unreserve(bo);
  72                 radeon_bo_unref(&bo);
  73                 dev_err(rdev->dev, "(%d) semaphore pin failed\n", r);
  74                 return r;
  75         }
  76
  77         INIT_LIST_HEAD(&new_entrys);
  78         for (i = 0; i < bo_size/8; ++i) {
  79                 struct radeon_semaphore *sem = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
  80                 ttm_bo_reference(&bo->tbo);
  81                 sem->robj = bo;
  82                 sem->gpu_addr = gpu_addr;
  83                 gpu_addr += 8;
  84                 list_add_tail(&sem->list, &new_entrys);
  85         }
  86
  87         radeon_bo_unreserve(bo);
  88         radeon_bo_unref(&bo);
  89
  90         write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags);
  91         list_splice_tail(&new_entrys, &rdev->semaphore_drv.free);
  92         write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
  93
  94         DRM_INFO("%d new semaphores allocated\n", (int)(bo_size/8));
  95
  96         return 0;
  97 }
  98
  99 int radeon_semaphore_create(struct radeon_device *rdev,
 100                             struct radeon_semaphore **semaphore)
 101 {
 102         unsigned long irq_flags;
 103
 104         write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags);
 105         if (list_empty(&rdev->semaphore_drv.free)) {
 106                 int r;
 107                 write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
 108                 r = allocate_semaphores(rdev);
 109                 if (r)
 110                         return r;
 111                 write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags);
 112         }
 113
 114         *semaphore = list_first_entry(&rdev->semaphore_drv.free, struct radeon_semaphore, list);
 115         list_del(&(*semaphore)->list);
 116
 117         write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
 118         return 0;
 119 }
 120
 121 void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
 122                                   struct radeon_semaphore *semaphore)
 123 {
 124         radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, false);
 125 }
 126
 127 void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
 128                                 struct radeon_semaphore *semaphore)
 129 {
 130         radeon_semaphore_ring_emit(rdev, ring, &rdev->ring[ring], semaphore, true);
 131 }
 132
 133 void radeon_semaphore_free(struct radeon_device *rdev,
 134                           struct radeon_semaphore *semaphore)
 135 {
 136         unsigned long irq_flags;
 137
 138         write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags);
 139         list_add_tail(&semaphore->list, &rdev->semaphore_drv.free);
 140         write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
 141 }
 142
 143 void radeon_semaphore_driver_fini(struct radeon_device *rdev)
 144 {
 145         struct radeon_semaphore *i, *n;
 146         struct list_head entrys;
 147         unsigned long irq_flags;
 148
 149         INIT_LIST_HEAD(&entrys);
 150         write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags);
 151         if (!list_empty(&rdev->semaphore_drv.free)) {
 152                 list_splice(&rdev->semaphore_drv.free, &entrys);
 153         }
 154         INIT_LIST_HEAD(&rdev->semaphore_drv.free);
 155         write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
 156
 157         list_for_each_entry_safe(i, n, &entrys, list) {
 158                 radeon_bo_unref(&i->robj);
 159                 kfree(i);
 160         }
 161 }