1 /*
2  * Copyright 2010 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 "evergreend.h"
28 
29 u32 evergreen_gpu_check_soft_reset(struct radeon_device *rdev);
30 
31 /**
32  * evergreen_dma_fence_ring_emit - emit a fence on the DMA ring
33  *
34  * @rdev: radeon_device pointer
35  * @fence: radeon fence object
36  *
37  * Add a DMA fence packet to the ring to write
38  * the fence seq number and DMA trap packet to generate
39  * an interrupt if needed (evergreen-SI).
40  */
41 void evergreen_dma_fence_ring_emit(struct radeon_device *rdev,
42 				   struct radeon_fence *fence)
43 {
44 	struct radeon_ring *ring = &rdev->ring[fence->ring];
45 	u64 addr = rdev->fence_drv[fence->ring].gpu_addr;
46 	/* write the fence */
47 	radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_FENCE, 0, 0));
48 	radeon_ring_write(ring, addr & 0xfffffffc);
49 	radeon_ring_write(ring, (upper_32_bits(addr) & 0xff));
50 	radeon_ring_write(ring, fence->seq);
51 	/* generate an interrupt */
52 	radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_TRAP, 0, 0));
53 	/* flush HDP */
54 	radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0));
55 	radeon_ring_write(ring, (0xf << 16) | (HDP_MEM_COHERENCY_FLUSH_CNTL >> 2));
56 	radeon_ring_write(ring, 1);
57 }
58 
59 /**
60  * evergreen_dma_ring_ib_execute - schedule an IB on the DMA engine
61  *
62  * @rdev: radeon_device pointer
63  * @ib: IB object to schedule
64  *
65  * Schedule an IB in the DMA ring (evergreen).
66  */
67 void evergreen_dma_ring_ib_execute(struct radeon_device *rdev,
68 				   struct radeon_ib *ib)
69 {
70 	struct radeon_ring *ring = &rdev->ring[ib->ring];
71 
72 	if (rdev->wb.enabled) {
73 		u32 next_rptr = ring->wptr + 4;
74 		while ((next_rptr & 7) != 5)
75 			next_rptr++;
76 		next_rptr += 3;
77 		radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 1));
78 		radeon_ring_write(ring, ring->next_rptr_gpu_addr & 0xfffffffc);
79 		radeon_ring_write(ring, upper_32_bits(ring->next_rptr_gpu_addr) & 0xff);
80 		radeon_ring_write(ring, next_rptr);
81 	}
82 
83 	/* The indirect buffer packet must end on an 8 DW boundary in the DMA ring.
84 	 * Pad as necessary with NOPs.
85 	 */
86 	while ((ring->wptr & 7) != 5)
87 		radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_NOP, 0, 0));
88 	radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_INDIRECT_BUFFER, 0, 0));
89 	radeon_ring_write(ring, (ib->gpu_addr & 0xFFFFFFE0));
90 	radeon_ring_write(ring, (ib->length_dw << 12) | (upper_32_bits(ib->gpu_addr) & 0xFF));
91 
92 }
93 
94 /**
95  * evergreen_copy_dma - copy pages using the DMA engine
96  *
97  * @rdev: radeon_device pointer
98  * @src_offset: src GPU address
99  * @dst_offset: dst GPU address
100  * @num_gpu_pages: number of GPU pages to xfer
101  * @fence: radeon fence object
102  *
103  * Copy GPU paging using the DMA engine (evergreen-cayman).
104  * Used by the radeon ttm implementation to move pages if
105  * registered as the asic copy callback.
106  */
107 struct radeon_fence *evergreen_copy_dma(struct radeon_device *rdev,
108 					uint64_t src_offset,
109 					uint64_t dst_offset,
110 					unsigned num_gpu_pages,
111 					struct reservation_object *resv)
112 {
113 	struct radeon_fence *fence;
114 	struct radeon_sync sync;
115 	int ring_index = rdev->asic->copy.dma_ring_index;
116 	struct radeon_ring *ring = &rdev->ring[ring_index];
117 	u32 size_in_dw, cur_size_in_dw;
118 	int i, num_loops;
119 	int r = 0;
120 
121 	radeon_sync_create(&sync);
122 
123 	size_in_dw = (num_gpu_pages << RADEON_GPU_PAGE_SHIFT) / 4;
124 	num_loops = DIV_ROUND_UP(size_in_dw, 0xfffff);
125 	r = radeon_ring_lock(rdev, ring, num_loops * 5 + 11);
126 	if (r) {
127 		DRM_ERROR("radeon: moving bo (%d).\n", r);
128 		radeon_sync_free(rdev, &sync, NULL);
129 		return ERR_PTR(r);
130 	}
131 
132 	radeon_sync_resv(rdev, &sync, resv, false);
133 	radeon_sync_rings(rdev, &sync, ring->idx);
134 
135 	for (i = 0; i < num_loops; i++) {
136 		cur_size_in_dw = size_in_dw;
137 		if (cur_size_in_dw > 0xFFFFF)
138 			cur_size_in_dw = 0xFFFFF;
139 		size_in_dw -= cur_size_in_dw;
140 		radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 0, cur_size_in_dw));
141 		radeon_ring_write(ring, dst_offset & 0xfffffffc);
142 		radeon_ring_write(ring, src_offset & 0xfffffffc);
143 		radeon_ring_write(ring, upper_32_bits(dst_offset) & 0xff);
144 		radeon_ring_write(ring, upper_32_bits(src_offset) & 0xff);
145 		src_offset += cur_size_in_dw * 4;
146 		dst_offset += cur_size_in_dw * 4;
147 	}
148 
149 	r = radeon_fence_emit(rdev, &fence, ring->idx);
150 	if (r) {
151 		radeon_ring_unlock_undo(rdev, ring);
152 		radeon_sync_free(rdev, &sync, NULL);
153 		return ERR_PTR(r);
154 	}
155 
156 	radeon_ring_unlock_commit(rdev, ring, false);
157 	radeon_sync_free(rdev, &sync, fence);
158 
159 	return fence;
160 }
161 
162 /**
163  * evergreen_dma_is_lockup - Check if the DMA engine is locked up
164  *
165  * @rdev: radeon_device pointer
166  * @ring: radeon_ring structure holding ring information
167  *
168  * Check if the async DMA engine is locked up.
169  * Returns true if the engine appears to be locked up, false if not.
170  */
171 bool evergreen_dma_is_lockup(struct radeon_device *rdev, struct radeon_ring *ring)
172 {
173 	u32 reset_mask = evergreen_gpu_check_soft_reset(rdev);
174 
175 	if (!(reset_mask & RADEON_RESET_DMA)) {
176 		radeon_ring_lockup_update(rdev, ring);
177 		return false;
178 	}
179 	return radeon_ring_test_lockup(rdev, ring);
180 }
181 
182 
183