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  * @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  */
  42 int 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         radeon_semaphore_sync_to(sem, *fence);
  70         radeon_semaphore_sync_rings(rdev, sem, ring->idx);
  71
  72         for (i = 0; i < num_loops; i++) {
  73                 cur_size_in_dw = size_in_dw;
  74                 if (cur_size_in_dw > 0xFFFF)
  75                         cur_size_in_dw = 0xFFFF;
  76                 size_in_dw -= cur_size_in_dw;
  77                 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 0, 0, cur_size_in_dw));
  78                 radeon_ring_write(ring, dst_offset & 0xfffffffc);
  79                 radeon_ring_write(ring, src_offset & 0xfffffffc);
  80                 radeon_ring_write(ring, upper_32_bits(dst_offset) & 0xff);
  81                 radeon_ring_write(ring, upper_32_bits(src_offset) & 0xff);
  82                 src_offset += cur_size_in_dw * 4;
  83                 dst_offset += cur_size_in_dw * 4;
  84         }
  85
  86         r = radeon_fence_emit(rdev, fence, ring->idx);
  87         if (r) {
  88                 radeon_ring_unlock_undo(rdev, ring);
  89                 return r;
  90         }
  91
  92         radeon_ring_unlock_commit(rdev, ring);
  93         radeon_semaphore_free(rdev, &sem, *fence);
  94
  95         return r;
  96 }