1 /*
2 * Copyright 2014 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 */
23
24 #include <linux/dma-mapping.h>
25
26 #include "amdgpu.h"
27 #include "amdgpu_ih.h"
28
29 /**
30 * amdgpu_ih_ring_init - initialize the IH state
31 *
32 * @adev: amdgpu_device pointer
33 * @ih: ih ring to initialize
34 * @ring_size: ring size to allocate
35 * @use_bus_addr: true when we can use dma_alloc_coherent
36 *
37 * Initializes the IH state and allocates a buffer
38 * for the IH ring buffer.
39 * Returns 0 for success, errors for failure.
40 */
amdgpu_ih_ring_init(struct amdgpu_device * adev,struct amdgpu_ih_ring * ih,unsigned ring_size,bool use_bus_addr)41 int amdgpu_ih_ring_init(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih,
42 unsigned ring_size, bool use_bus_addr)
43 {
44 u32 rb_bufsz;
45 int r;
46
47 /* Align ring size */
48 rb_bufsz = order_base_2(ring_size / 4);
49 ring_size = (1 << rb_bufsz) * 4;
50 ih->ring_size = ring_size;
51 ih->ptr_mask = ih->ring_size - 1;
52 ih->rptr = 0;
53 ih->use_bus_addr = use_bus_addr;
54
55 if (use_bus_addr) {
56 dma_addr_t dma_addr;
57
58 if (ih->ring)
59 return 0;
60
61 /* add 8 bytes for the rptr/wptr shadows and
62 * add them to the end of the ring allocation.
63 */
64 ih->ring = dma_alloc_coherent(adev->dev, ih->ring_size + 8,
65 &dma_addr, GFP_KERNEL);
66 if (ih->ring == NULL)
67 return -ENOMEM;
68
69 ih->gpu_addr = dma_addr;
70 ih->wptr_addr = dma_addr + ih->ring_size;
71 ih->wptr_cpu = &ih->ring[ih->ring_size / 4];
72 ih->rptr_addr = dma_addr + ih->ring_size + 4;
73 ih->rptr_cpu = &ih->ring[(ih->ring_size / 4) + 1];
74 } else {
75 unsigned wptr_offs, rptr_offs;
76
77 r = amdgpu_device_wb_get(adev, &wptr_offs);
78 if (r)
79 return r;
80
81 r = amdgpu_device_wb_get(adev, &rptr_offs);
82 if (r) {
83 amdgpu_device_wb_free(adev, wptr_offs);
84 return r;
85 }
86
87 r = amdgpu_bo_create_kernel(adev, ih->ring_size, PAGE_SIZE,
88 AMDGPU_GEM_DOMAIN_GTT,
89 &ih->ring_obj, &ih->gpu_addr,
90 (void **)&ih->ring);
91 if (r) {
92 amdgpu_device_wb_free(adev, rptr_offs);
93 amdgpu_device_wb_free(adev, wptr_offs);
94 return r;
95 }
96
97 ih->wptr_addr = adev->wb.gpu_addr + wptr_offs * 4;
98 ih->wptr_cpu = &adev->wb.wb[wptr_offs];
99 ih->rptr_addr = adev->wb.gpu_addr + rptr_offs * 4;
100 ih->rptr_cpu = &adev->wb.wb[rptr_offs];
101 }
102
103 init_waitqueue_head(&ih->wait_process);
104 return 0;
105 }
106
107 /**
108 * amdgpu_ih_ring_fini - tear down the IH state
109 *
110 * @adev: amdgpu_device pointer
111 * @ih: ih ring to tear down
112 *
113 * Tears down the IH state and frees buffer
114 * used for the IH ring buffer.
115 */
amdgpu_ih_ring_fini(struct amdgpu_device * adev,struct amdgpu_ih_ring * ih)116 void amdgpu_ih_ring_fini(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
117 {
118
119 if (!ih->ring)
120 return;
121
122 if (ih->use_bus_addr) {
123
124 /* add 8 bytes for the rptr/wptr shadows and
125 * add them to the end of the ring allocation.
126 */
127 dma_free_coherent(adev->dev, ih->ring_size + 8,
128 (void *)ih->ring, ih->gpu_addr);
129 ih->ring = NULL;
130 } else {
131 amdgpu_bo_free_kernel(&ih->ring_obj, &ih->gpu_addr,
132 (void **)&ih->ring);
133 amdgpu_device_wb_free(adev, (ih->wptr_addr - ih->gpu_addr) / 4);
134 amdgpu_device_wb_free(adev, (ih->rptr_addr - ih->gpu_addr) / 4);
135 }
136 }
137
138 /**
139 * amdgpu_ih_ring_write - write IV to the ring buffer
140 *
141 * @ih: ih ring to write to
142 * @iv: the iv to write
143 * @num_dw: size of the iv in dw
144 *
145 * Writes an IV to the ring buffer using the CPU and increment the wptr.
146 * Used for testing and delegating IVs to a software ring.
147 */
amdgpu_ih_ring_write(struct amdgpu_ih_ring * ih,const uint32_t * iv,unsigned int num_dw)148 void amdgpu_ih_ring_write(struct amdgpu_ih_ring *ih, const uint32_t *iv,
149 unsigned int num_dw)
150 {
151 uint32_t wptr = le32_to_cpu(*ih->wptr_cpu) >> 2;
152 unsigned int i;
153
154 for (i = 0; i < num_dw; ++i)
155 ih->ring[wptr++] = cpu_to_le32(iv[i]);
156
157 wptr <<= 2;
158 wptr &= ih->ptr_mask;
159
160 /* Only commit the new wptr if we don't overflow */
161 if (wptr != READ_ONCE(ih->rptr)) {
162 wmb();
163 WRITE_ONCE(*ih->wptr_cpu, cpu_to_le32(wptr));
164 }
165 }
166
167 /**
168 * amdgpu_ih_wait_on_checkpoint_process_ts - wait to process IVs up to checkpoint
169 *
170 * @adev: amdgpu_device pointer
171 * @ih: ih ring to process
172 *
173 * Used to ensure ring has processed IVs up to the checkpoint write pointer.
174 */
amdgpu_ih_wait_on_checkpoint_process_ts(struct amdgpu_device * adev,struct amdgpu_ih_ring * ih)175 int amdgpu_ih_wait_on_checkpoint_process_ts(struct amdgpu_device *adev,
176 struct amdgpu_ih_ring *ih)
177 {
178 uint32_t checkpoint_wptr;
179 uint64_t checkpoint_ts;
180 long timeout = HZ;
181
182 if (!ih->enabled || adev->shutdown)
183 return -ENODEV;
184
185 checkpoint_wptr = amdgpu_ih_get_wptr(adev, ih);
186 /* Order wptr with ring data. */
187 rmb();
188 checkpoint_ts = amdgpu_ih_decode_iv_ts(adev, ih, checkpoint_wptr, -1);
189
190 return wait_event_interruptible_timeout(ih->wait_process,
191 amdgpu_ih_ts_after(checkpoint_ts, ih->processed_timestamp) ||
192 ih->rptr == amdgpu_ih_get_wptr(adev, ih), timeout);
193 }
194
195 /**
196 * amdgpu_ih_process - interrupt handler
197 *
198 * @adev: amdgpu_device pointer
199 * @ih: ih ring to process
200 *
201 * Interrupt hander (VI), walk the IH ring.
202 * Returns irq process return code.
203 */
amdgpu_ih_process(struct amdgpu_device * adev,struct amdgpu_ih_ring * ih)204 int amdgpu_ih_process(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
205 {
206 unsigned int count;
207 u32 wptr;
208
209 if (!ih->enabled || adev->shutdown)
210 return IRQ_NONE;
211
212 wptr = amdgpu_ih_get_wptr(adev, ih);
213
214 restart_ih:
215 count = AMDGPU_IH_MAX_NUM_IVS;
216 DRM_DEBUG("%s: rptr %d, wptr %d\n", __func__, ih->rptr, wptr);
217
218 /* Order reading of wptr vs. reading of IH ring data */
219 rmb();
220
221 while (ih->rptr != wptr && --count) {
222 amdgpu_irq_dispatch(adev, ih);
223 ih->rptr &= ih->ptr_mask;
224 }
225
226 amdgpu_ih_set_rptr(adev, ih);
227 wake_up_all(&ih->wait_process);
228
229 /* make sure wptr hasn't changed while processing */
230 wptr = amdgpu_ih_get_wptr(adev, ih);
231 if (wptr != ih->rptr)
232 goto restart_ih;
233
234 return IRQ_HANDLED;
235 }
236
237 /**
238 * amdgpu_ih_decode_iv_helper - decode an interrupt vector
239 *
240 * @adev: amdgpu_device pointer
241 * @ih: ih ring to process
242 * @entry: IV entry
243 *
244 * Decodes the interrupt vector at the current rptr
245 * position and also advance the position for Vega10
246 * and later GPUs.
247 */
amdgpu_ih_decode_iv_helper(struct amdgpu_device * adev,struct amdgpu_ih_ring * ih,struct amdgpu_iv_entry * entry)248 void amdgpu_ih_decode_iv_helper(struct amdgpu_device *adev,
249 struct amdgpu_ih_ring *ih,
250 struct amdgpu_iv_entry *entry)
251 {
252 /* wptr/rptr are in bytes! */
253 u32 ring_index = ih->rptr >> 2;
254 uint32_t dw[8];
255
256 dw[0] = le32_to_cpu(ih->ring[ring_index + 0]);
257 dw[1] = le32_to_cpu(ih->ring[ring_index + 1]);
258 dw[2] = le32_to_cpu(ih->ring[ring_index + 2]);
259 dw[3] = le32_to_cpu(ih->ring[ring_index + 3]);
260 dw[4] = le32_to_cpu(ih->ring[ring_index + 4]);
261 dw[5] = le32_to_cpu(ih->ring[ring_index + 5]);
262 dw[6] = le32_to_cpu(ih->ring[ring_index + 6]);
263 dw[7] = le32_to_cpu(ih->ring[ring_index + 7]);
264
265 entry->client_id = dw[0] & 0xff;
266 entry->src_id = (dw[0] >> 8) & 0xff;
267 entry->ring_id = (dw[0] >> 16) & 0xff;
268 entry->vmid = (dw[0] >> 24) & 0xf;
269 entry->vmid_src = (dw[0] >> 31);
270 entry->timestamp = dw[1] | ((u64)(dw[2] & 0xffff) << 32);
271 entry->timestamp_src = dw[2] >> 31;
272 entry->pasid = dw[3] & 0xffff;
273 entry->pasid_src = dw[3] >> 31;
274 entry->src_data[0] = dw[4];
275 entry->src_data[1] = dw[5];
276 entry->src_data[2] = dw[6];
277 entry->src_data[3] = dw[7];
278
279 /* wptr/rptr are in bytes! */
280 ih->rptr += 32;
281 }
282
amdgpu_ih_decode_iv_ts_helper(struct amdgpu_ih_ring * ih,u32 rptr,signed int offset)283 uint64_t amdgpu_ih_decode_iv_ts_helper(struct amdgpu_ih_ring *ih, u32 rptr,
284 signed int offset)
285 {
286 uint32_t iv_size = 32;
287 uint32_t ring_index;
288 uint32_t dw1, dw2;
289
290 rptr += iv_size * offset;
291 ring_index = (rptr & ih->ptr_mask) >> 2;
292
293 dw1 = le32_to_cpu(ih->ring[ring_index + 1]);
294 dw2 = le32_to_cpu(ih->ring[ring_index + 2]);
295 return dw1 | ((u64)(dw2 & 0xffff) << 32);
296 }
297