LXR linux/drivers/gpu/drm/radeon/rv770

   1/*
   2 * Copyright 2013 Advanced Micro Devices, Inc.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: Alex Deucher
  23 */
  24#include <drm/drmP.h>
  25#include "radeon.h"
  26#include "radeon_asic.h"
  27#include "rv770d.h"
  28
  29/**
  30 * rv770_copy_dma - copy pages using the DMA engine
  31 *
  32 * @rdev: radeon_device pointer
  33 * @src_offset: src GPU address
  34 * @dst_offset: dst GPU address
  35 * @num_gpu_pages: number of GPU pages to xfer
  36 * @fence: radeon fence object
  37 *
  38 * Copy GPU paging using the DMA engine (r7xx).
  39 * Used by the radeon ttm implementation to move pages if
  40 * registered as the asic copy callback.
  41 */
  42int rv770_copy_dma(struct radeon_device *rdev,
  43                  uint64_t src_offset, uint64_t dst_offset,
  44                  unsigned num_gpu_pages,
  45                  struct radeon_fence **fence)
  46{
  47        struct radeon_semaphore *sem = NULL;
  48        int ring_index = rdev->asic->copy.dma_ring_index;
  49        struct radeon_ring *ring = &rdev->ring[ring_index];
  50        u32 size_in_dw, cur_size_in_dw;
  51        int i, num_loops;
  52        int r = 0;
  53
  54        r = radeon_semaphore_create(rdev, &sem);
  55        if (r) {
  56                DRM_ERROR("radeon: moving bo (%d).\n", r);
  57                return r;
  58        }
  59
  60        size_in_dw = (num_gpu_pages << RADEON_GPU_PAGE_SHIFT) / 4;
  61        num_loops = DIV_ROUND_UP(size_in_dw, 0xFFFF);
  62        r = radeon_ring_lock(rdev, ring, num_loops * 5 + 8);
  63        if (r) {
  64                DRM_ERROR("radeon: moving bo (%d).\n", r);
  65                radeon_semaphore_free(rdev, &sem, NULL);
  66                return r;
  67        }
  68
  69        if (radeon_fence_need_sync(*fence, ring->idx)) {
  70                radeon_semaphore_sync_rings(rdev, sem, (*fence)->ring,
  71                                            ring->idx);
  72                radeon_fence_note_sync(*fence, ring->idx);
  73        } else {
  74                radeon_semaphore_free(rdev, &sem, NULL);
  75        }
  76
  77        for (i = 0; i < num_loops; i++) {
  78                cur_size_in_dw = size_in_dw;
  79                if (cur_size_in_dw > 0xFFFF)
  80                        cur_size_in_dw = 0xFFFF;
  81                size_in_dw -= cur_size_in_dw;
  82                radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 0, 0, cur_size_in_dw));
  83                radeon_ring_write(ring, dst_offset & 0xfffffffc);
  84                radeon_ring_write(ring, src_offset & 0xfffffffc);
  85                radeon_ring_write(ring, upper_32_bits(dst_offset) & 0xff);
  86                radeon_ring_write(ring, upper_32_bits(src_offset) & 0xff);
  87                src_offset += cur_size_in_dw * 4;
  88                dst_offset += cur_size_in_dw * 4;
  89        }
  90
  91        r = radeon_fence_emit(rdev, fence, ring->idx);
  92        if (r) {
  93                radeon_ring_unlock_undo(rdev, ring);
  94                return r;
  95        }
  96
  97        radeon_ring_unlock_commit(rdev, ring);
  98        radeon_semaphore_free(rdev, &sem, *fence);
  99
 100        return r;
 101}
 102