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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  */
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  */
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  * @adev: amdgpu_device pointer
142  * @ih: ih ring to write to
143  * @iv: the iv to write
144  * @num_dw: size of the iv in dw
145  *
146  * Writes an IV to the ring buffer using the CPU and increment the wptr.
147  * Used for testing and delegating IVs to a software ring.
148  */
149 void amdgpu_ih_ring_write(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih,
150                           const uint32_t *iv, unsigned int num_dw)
151 {
152         uint32_t wptr = le32_to_cpu(*ih->wptr_cpu) >> 2;
153         unsigned int i;
154
155         for (i = 0; i < num_dw; ++i)
156                 ih->ring[wptr++] = cpu_to_le32(iv[i]);
157
158         wptr <<= 2;
159         wptr &= ih->ptr_mask;
160
161         /* Only commit the new wptr if we don't overflow */
162         if (wptr != READ_ONCE(ih->rptr)) {
163                 wmb();
164                 WRITE_ONCE(*ih->wptr_cpu, cpu_to_le32(wptr));
165         } else if (adev->irq.retry_cam_enabled) {
166                 dev_warn_once(adev->dev, "IH soft ring buffer overflow 0x%X, 0x%X\n",
167                               wptr, ih->rptr);
168         }
169 }
170
171 /**
172  * amdgpu_ih_wait_on_checkpoint_process_ts - wait to process IVs up to checkpoint
173  *
174  * @adev: amdgpu_device pointer
175  * @ih: ih ring to process
176  *
177  * Used to ensure ring has processed IVs up to the checkpoint write pointer.
178  */
179 int amdgpu_ih_wait_on_checkpoint_process_ts(struct amdgpu_device *adev,
180                                         struct amdgpu_ih_ring *ih)
181 {
182         uint32_t checkpoint_wptr;
183         uint64_t checkpoint_ts;
184         long timeout = HZ;
185
186         if (!ih->enabled || adev->shutdown)
187                 return -ENODEV;
188
189         checkpoint_wptr = amdgpu_ih_get_wptr(adev, ih);
190         /* Order wptr with ring data. */
191         rmb();
192         checkpoint_ts = amdgpu_ih_decode_iv_ts(adev, ih, checkpoint_wptr, -1);
193
194         return wait_event_interruptible_timeout(ih->wait_process,
195                     amdgpu_ih_ts_after(checkpoint_ts, ih->processed_timestamp) ||
196                     ih->rptr == amdgpu_ih_get_wptr(adev, ih), timeout);
197 }
198
199 /**
200  * amdgpu_ih_process - interrupt handler
201  *
202  * @adev: amdgpu_device pointer
203  * @ih: ih ring to process
204  *
205  * Interrupt hander (VI), walk the IH ring.
206  * Returns irq process return code.
207  */
208 int amdgpu_ih_process(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
209 {
210         unsigned int count;
211         u32 wptr;
212
213         if (!ih->enabled || adev->shutdown)
214                 return IRQ_NONE;
215
216         wptr = amdgpu_ih_get_wptr(adev, ih);
217
218 restart_ih:
219         count  = AMDGPU_IH_MAX_NUM_IVS;
220         DRM_DEBUG("%s: rptr %d, wptr %d\n", __func__, ih->rptr, wptr);
221
222         /* Order reading of wptr vs. reading of IH ring data */
223         rmb();
224
225         while (ih->rptr != wptr && --count) {
226                 amdgpu_irq_dispatch(adev, ih);
227                 ih->rptr &= ih->ptr_mask;
228         }
229
230         amdgpu_ih_set_rptr(adev, ih);
231         wake_up_all(&ih->wait_process);
232
233         /* make sure wptr hasn't changed while processing */
234         wptr = amdgpu_ih_get_wptr(adev, ih);
235         if (wptr != ih->rptr)
236                 goto restart_ih;
237
238         return IRQ_HANDLED;
239 }
240
241 /**
242  * amdgpu_ih_decode_iv_helper - decode an interrupt vector
243  *
244  * @adev: amdgpu_device pointer
245  * @ih: ih ring to process
246  * @entry: IV entry
247  *
248  * Decodes the interrupt vector at the current rptr
249  * position and also advance the position for Vega10
250  * and later GPUs.
251  */
252 void amdgpu_ih_decode_iv_helper(struct amdgpu_device *adev,
253                                 struct amdgpu_ih_ring *ih,
254                                 struct amdgpu_iv_entry *entry)
255 {
256         /* wptr/rptr are in bytes! */
257         u32 ring_index = ih->rptr >> 2;
258         uint32_t dw[8];
259
260         dw[0] = le32_to_cpu(ih->ring[ring_index + 0]);
261         dw[1] = le32_to_cpu(ih->ring[ring_index + 1]);
262         dw[2] = le32_to_cpu(ih->ring[ring_index + 2]);
263         dw[3] = le32_to_cpu(ih->ring[ring_index + 3]);
264         dw[4] = le32_to_cpu(ih->ring[ring_index + 4]);
265         dw[5] = le32_to_cpu(ih->ring[ring_index + 5]);
266         dw[6] = le32_to_cpu(ih->ring[ring_index + 6]);
267         dw[7] = le32_to_cpu(ih->ring[ring_index + 7]);
268
269         entry->client_id = dw[0] & 0xff;
270         entry->src_id = (dw[0] >> 8) & 0xff;
271         entry->ring_id = (dw[0] >> 16) & 0xff;
272         entry->vmid = (dw[0] >> 24) & 0xf;
273         entry->vmid_src = (dw[0] >> 31);
274         entry->timestamp = dw[1] | ((u64)(dw[2] & 0xffff) << 32);
275         entry->timestamp_src = dw[2] >> 31;
276         entry->pasid = dw[3] & 0xffff;
277         entry->node_id = (dw[3] >> 16) & 0xff;
278         entry->src_data[0] = dw[4];
279         entry->src_data[1] = dw[5];
280         entry->src_data[2] = dw[6];
281         entry->src_data[3] = dw[7];
282
283         /* wptr/rptr are in bytes! */
284         ih->rptr += 32;
285 }
286
287 uint64_t amdgpu_ih_decode_iv_ts_helper(struct amdgpu_ih_ring *ih, u32 rptr,
288                                        signed int offset)
289 {
290         uint32_t iv_size = 32;
291         uint32_t ring_index;
292         uint32_t dw1, dw2;
293
294         rptr += iv_size * offset;
295         ring_index = (rptr & ih->ptr_mask) >> 2;
296
297         dw1 = le32_to_cpu(ih->ring[ring_index + 1]);
298         dw2 = le32_to_cpu(ih->ring[ring_index + 2]);
299         return dw1 | ((u64)(dw2 & 0xffff) << 32);
300 }
301
302 const char *amdgpu_ih_ring_name(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
303 {
304         return ih == &adev->irq.ih ? "ih" : ih == &adev->irq.ih_soft ? "sw ih" :
305                ih == &adev->irq.ih1 ? "ih1" : ih == &adev->irq.ih2 ? "ih2" : "unknown";
306 }
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