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 * @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 */ 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 */ 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 */ 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 */ 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 } 282 283 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