drivers/gpu/drm/radeon/rv770_dma.c

   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  * @resv: reservation object to sync to
  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  */
  42 struct radeon_fence *rv770_copy_dma(struct radeon_device *rdev,
  43                                     uint64_t src_offset, uint64_t dst_offset,
  44                                     unsigned num_gpu_pages,
  45                                     struct reservation_object *resv)
  46 {
  47         struct radeon_fence *fence;
  48         struct radeon_sync sync;
  49         int ring_index = rdev->asic->copy.dma_ring_index;
  50         struct radeon_ring *ring = &rdev->ring[ring_index];
  51         u32 size_in_dw, cur_size_in_dw;
  52         int i, num_loops;
  53         int r = 0;
  54
  55         radeon_sync_create(&sync);
  56
  57         size_in_dw = (num_gpu_pages << RADEON_GPU_PAGE_SHIFT) / 4;
  58         num_loops = DIV_ROUND_UP(size_in_dw, 0xFFFF);
  59         r = radeon_ring_lock(rdev, ring, num_loops * 5 + 8);
  60         if (r) {
  61                 DRM_ERROR("radeon: moving bo (%d).\n", r);
  62                 radeon_sync_free(rdev, &sync, NULL);
  63                 return ERR_PTR(r);
  64         }
  65
  66         radeon_sync_resv(rdev, &sync, resv, false);
  67         radeon_sync_rings(rdev, &sync, ring->idx);
  68
  69         for (i = 0; i < num_loops; i++) {
  70                 cur_size_in_dw = size_in_dw;
  71                 if (cur_size_in_dw > 0xFFFF)
  72                         cur_size_in_dw = 0xFFFF;
  73                 size_in_dw -= cur_size_in_dw;
  74                 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 0, 0, cur_size_in_dw));
  75                 radeon_ring_write(ring, dst_offset & 0xfffffffc);
  76                 radeon_ring_write(ring, src_offset & 0xfffffffc);
  77                 radeon_ring_write(ring, upper_32_bits(dst_offset) & 0xff);
  78                 radeon_ring_write(ring, upper_32_bits(src_offset) & 0xff);
  79                 src_offset += cur_size_in_dw * 4;
  80                 dst_offset += cur_size_in_dw * 4;
  81         }
  82
  83         r = radeon_fence_emit(rdev, &fence, ring->idx);
  84         if (r) {
  85                 radeon_ring_unlock_undo(rdev, ring);
  86                 radeon_sync_free(rdev, &sync, NULL);
  87                 return ERR_PTR(r);
  88         }
  89
  90         radeon_ring_unlock_commit(rdev, ring, false);
  91         radeon_sync_free(rdev, &sync, fence);
  92
  93         return fence;
  94 }