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      1 /*	$NetBSD: radeon_rv770_dma.c,v 1.2 2021/12/18 23:45:43 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2013 Advanced Micro Devices, Inc.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     22  * OTHER DEALINGS IN THE SOFTWARE.
     23  *
     24  * Authors: Alex Deucher
     25  */
     26 
     27 #include <sys/cdefs.h>
     28 __KERNEL_RCSID(0, "$NetBSD: radeon_rv770_dma.c,v 1.2 2021/12/18 23:45:43 riastradh Exp $");
     29 
     30 #include "radeon.h"
     31 #include "radeon_asic.h"
     32 #include "rv770d.h"
     33 
     34 /**
     35  * rv770_copy_dma - copy pages using the DMA engine
     36  *
     37  * @rdev: radeon_device pointer
     38  * @src_offset: src GPU address
     39  * @dst_offset: dst GPU address
     40  * @num_gpu_pages: number of GPU pages to xfer
     41  * @resv: reservation object to sync to
     42  *
     43  * Copy GPU paging using the DMA engine (r7xx).
     44  * Used by the radeon ttm implementation to move pages if
     45  * registered as the asic copy callback.
     46  */
     47 struct radeon_fence *rv770_copy_dma(struct radeon_device *rdev,
     48 				    uint64_t src_offset, uint64_t dst_offset,
     49 				    unsigned num_gpu_pages,
     50 				    struct dma_resv *resv)
     51 {
     52 	struct radeon_fence *fence;
     53 	struct radeon_sync sync;
     54 	int ring_index = rdev->asic->copy.dma_ring_index;
     55 	struct radeon_ring *ring = &rdev->ring[ring_index];
     56 	u32 size_in_dw, cur_size_in_dw;
     57 	int i, num_loops;
     58 	int r = 0;
     59 
     60 	radeon_sync_create(&sync);
     61 
     62 	size_in_dw = (num_gpu_pages << RADEON_GPU_PAGE_SHIFT) / 4;
     63 	num_loops = DIV_ROUND_UP(size_in_dw, 0xFFFF);
     64 	r = radeon_ring_lock(rdev, ring, num_loops * 5 + 8);
     65 	if (r) {
     66 		DRM_ERROR("radeon: moving bo (%d).\n", r);
     67 		radeon_sync_free(rdev, &sync, NULL);
     68 		return ERR_PTR(r);
     69 	}
     70 
     71 	radeon_sync_resv(rdev, &sync, resv, false);
     72 	radeon_sync_rings(rdev, &sync, ring->idx);
     73 
     74 	for (i = 0; i < num_loops; i++) {
     75 		cur_size_in_dw = size_in_dw;
     76 		if (cur_size_in_dw > 0xFFFF)
     77 			cur_size_in_dw = 0xFFFF;
     78 		size_in_dw -= cur_size_in_dw;
     79 		radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 0, 0, cur_size_in_dw));
     80 		radeon_ring_write(ring, dst_offset & 0xfffffffc);
     81 		radeon_ring_write(ring, src_offset & 0xfffffffc);
     82 		radeon_ring_write(ring, upper_32_bits(dst_offset) & 0xff);
     83 		radeon_ring_write(ring, upper_32_bits(src_offset) & 0xff);
     84 		src_offset += cur_size_in_dw * 4;
     85 		dst_offset += cur_size_in_dw * 4;
     86 	}
     87 
     88 	r = radeon_fence_emit(rdev, &fence, ring->idx);
     89 	if (r) {
     90 		radeon_ring_unlock_undo(rdev, ring);
     91 		radeon_sync_free(rdev, &sync, NULL);
     92 		return ERR_PTR(r);
     93 	}
     94 
     95 	radeon_ring_unlock_commit(rdev, ring, false);
     96 	radeon_sync_free(rdev, &sync, fence);
     97 
     98 	return fence;
     99 }
    100