2 * Copyright 2014 Advanced Micro Devices, Inc.
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5 * copy of this software and associated documentation files (the "Software"),
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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
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24 #include <linux/dma-mapping.h>
27 #include "amdgpu_ih.h"
30 * amdgpu_ih_ring_init - initialize the IH state
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
37 * Initializes the IH state and allocates a buffer
38 * for the IH ring buffer.
39 * Returns 0 for success, errors for failure.
41 int amdgpu_ih_ring_init(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih,
42 unsigned ring_size, bool use_bus_addr)
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;
53 ih->use_bus_addr = use_bus_addr;
61 /* add 8 bytes for the rptr/wptr shadows and
62 * add them to the end of the ring allocation.
64 ih->ring = dma_alloc_coherent(adev->dev, ih->ring_size + 8,
65 &dma_addr, GFP_KERNEL);
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];
75 unsigned wptr_offs, rptr_offs;
77 r = amdgpu_device_wb_get(adev, &wptr_offs);
81 r = amdgpu_device_wb_get(adev, &rptr_offs);
83 amdgpu_device_wb_free(adev, wptr_offs);
87 r = amdgpu_bo_create_kernel(adev, ih->ring_size, PAGE_SIZE,
88 AMDGPU_GEM_DOMAIN_GTT,
89 &ih->ring_obj, &ih->gpu_addr,
92 amdgpu_device_wb_free(adev, rptr_offs);
93 amdgpu_device_wb_free(adev, wptr_offs);
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];
103 init_waitqueue_head(&ih->wait_process);
108 * amdgpu_ih_ring_fini - tear down the IH state
110 * @adev: amdgpu_device pointer
111 * @ih: ih ring to tear down
113 * Tears down the IH state and frees buffer
114 * used for the IH ring buffer.
116 void amdgpu_ih_ring_fini(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
122 if (ih->use_bus_addr) {
124 /* add 8 bytes for the rptr/wptr shadows and
125 * add them to the end of the ring allocation.
127 dma_free_coherent(adev->dev, ih->ring_size + 8,
128 (void *)ih->ring, ih->gpu_addr);
131 amdgpu_bo_free_kernel(&ih->ring_obj, &ih->gpu_addr,
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);
139 * amdgpu_ih_ring_write - write IV to the ring buffer
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
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.
149 void amdgpu_ih_ring_write(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih,
150 const uint32_t *iv, unsigned int num_dw)
152 uint32_t wptr = le32_to_cpu(*ih->wptr_cpu) >> 2;
155 for (i = 0; i < num_dw; ++i)
156 ih->ring[wptr++] = cpu_to_le32(iv[i]);
159 wptr &= ih->ptr_mask;
161 /* Only commit the new wptr if we don't overflow */
162 if (wptr != READ_ONCE(ih->rptr)) {
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",
172 * amdgpu_ih_wait_on_checkpoint_process_ts - wait to process IVs up to checkpoint
174 * @adev: amdgpu_device pointer
175 * @ih: ih ring to process
177 * Used to ensure ring has processed IVs up to the checkpoint write pointer.
179 int amdgpu_ih_wait_on_checkpoint_process_ts(struct amdgpu_device *adev,
180 struct amdgpu_ih_ring *ih)
182 uint32_t checkpoint_wptr;
183 uint64_t checkpoint_ts;
186 if (!ih->enabled || adev->shutdown)
189 checkpoint_wptr = amdgpu_ih_get_wptr(adev, ih);
190 /* Order wptr with ring data. */
192 checkpoint_ts = amdgpu_ih_decode_iv_ts(adev, ih, checkpoint_wptr, -1);
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);
200 * amdgpu_ih_process - interrupt handler
202 * @adev: amdgpu_device pointer
203 * @ih: ih ring to process
205 * Interrupt hander (VI), walk the IH ring.
206 * Returns irq process return code.
208 int amdgpu_ih_process(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
213 if (!ih->enabled || adev->shutdown)
216 wptr = amdgpu_ih_get_wptr(adev, ih);
219 count = AMDGPU_IH_MAX_NUM_IVS;
220 DRM_DEBUG("%s: rptr %d, wptr %d\n", __func__, ih->rptr, wptr);
222 /* Order reading of wptr vs. reading of IH ring data */
225 while (ih->rptr != wptr && --count) {
226 amdgpu_irq_dispatch(adev, ih);
227 ih->rptr &= ih->ptr_mask;
230 amdgpu_ih_set_rptr(adev, ih);
231 wake_up_all(&ih->wait_process);
233 /* make sure wptr hasn't changed while processing */
234 wptr = amdgpu_ih_get_wptr(adev, ih);
235 if (wptr != ih->rptr)
242 * amdgpu_ih_decode_iv_helper - decode an interrupt vector
244 * @adev: amdgpu_device pointer
245 * @ih: ih ring to process
248 * Decodes the interrupt vector at the current rptr
249 * position and also advance the position for Vega10
252 void amdgpu_ih_decode_iv_helper(struct amdgpu_device *adev,
253 struct amdgpu_ih_ring *ih,
254 struct amdgpu_iv_entry *entry)
256 /* wptr/rptr are in bytes! */
257 u32 ring_index = ih->rptr >> 2;
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]);
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];
283 /* wptr/rptr are in bytes! */
287 uint64_t amdgpu_ih_decode_iv_ts_helper(struct amdgpu_ih_ring *ih, u32 rptr,
290 uint32_t iv_size = 32;
294 rptr += iv_size * offset;
295 ring_index = (rptr & ih->ptr_mask) >> 2;
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);
302 const char *amdgpu_ih_ring_name(struct amdgpu_device *adev, struct amdgpu_ih_ring *ih)
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";